Glass Ceramic Having A Quartz Solid Solution Phase

Quartz solid solution glass ceramics and precursors thereof are described, which are characterized by very good mechanical and optical properties and in particular can be used as restoration material in dentistry. 2. Glass ceramic according to claim 1 , which comprises 38.0 to 49.0 wt.-% SiO.3. Glass ceramic according to claim 1 , which comprises 26.0 to 38.0 wt.-% AlO.4. Glass ceramic according to claim 1 , which comprises 6.0 to 14.0 wt.-% MgO.5. Glass ceramic according to claim 1 , which comprises 14.0 to 18.0 wt.-% ZrO.7. Glass ceramic according to claim 1 , which comprises the quartz solid solution phase as main crystal phase.8. Glass ceramic according to claim 1 , which comprises a high-quartz solid solution phase claim 1 , a low-quartz solid solution phase or a mixture thereof.9. Glass ceramic according to claim 8 , which comprises the high-quartz solid solution phase in a higher amount than the low-quartz solid solution phase and which comprises the high-quartz solid solution phase as main crystal phase.10. Glass ceramic according to claim 8 , which comprises the low-quartz solid solution phase in a higher amount than the high-quartz solid solution phase and which comprises the low-quartz solid solution phase as main crystal phase.11. Glass ceramic according to claim 1 , which comprises zirconium oxide as a crystal phase.12. Starting glass claim 1 , which comprises the components of the glass ceramic according to .13. Starting glass according to claim 12 , which comprises nuclei for the crystallization of the quartz solid solution phase.14. Glass ceramic according to claim 1 , wherein the glass ceramic is present in the form of a powder claim 1 , a blank or a dental restoration.15. Process for preparing the starting glass with nuclei according to claim 13 , in which(a) the starting glass is subjected to a heat treatment at a temperature of from 750 to 870° C. for a period of 5 to 120 min.17. Process according to claim 16 , in which(b) the starting glass is ...

LITHIUM SILICATE MATERIALS

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools.

Method for the preparation of lithium silicate glasses and lithium silicate glass ceramics

The invention also relates to a lithium silicate glass and a lithium silicate glass ceramic which can be obtained using the method according to the invention, the use thereof as dental material and in particular for the preparation of dental restorations, as well as a glass-forming composition which is suitable for use in the method according to the invention.

Machining of ceramic materials

Milling strategies for machining dental ceramic materials are provided that reduce milling time while maintaining strength, accuracy and marginal integrity.

Lithium silicate glass ceramic and glass with ZrO2 content

Lithium silicate glass ceramics and glasses containing at least 6.1 wt.-% ZrO2 are provided which can advantageously be applied to zirconium oxide ceramics in particular by pressing-on in the viscous state and forming a solid bond with the zirconium oxide ceramics.

Glass ceramic with SiO2 as the main crystalline phase

Glass ceramics having SiO2 as main crystal phase and precursors thereof are described which are characterized by very good mechanical and optical properties and in particular can be used as restoration material in dentistry.

Lithium silicate glass ceramic

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Machining of Ceramic Materials

Milling strategies for machining dental ceramic materials are provided that reduce milling time while maintaining strength, accuracy and marginal integrity.

Process for the preparation of dental restorations

The invention relates to a process for preparing dental restorations, wherein a lithium silicate glass ceramic or a lithium silicate glass is used which contains at least 8.5 wt.-% transition metal oxide selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides.

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Multi-Colored Shaped Body

The present invention relates to a multi-colored shaped body having layers arranged on top of one another for producing dental restorations, a process for its production and its use for the manufacture of dental restorations.

LITHIUM SILICATE MATERIALS

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength. 1. A lithium silicate glass ceramic for dental restorations which comprises a main crystalline phase comprising lithium metasilicate , wherein the lithium metasilicate crystals comprise lamellar or platelet crystals.2. The lithium silicate glass ceramic of claim 1 , wherein the lithium metasilicate forms more than 50 and up to 80 vol. % of the lithium silicate glass ceramic.3. The lithium silicate glass ceramic of claim 1 , wherein the glass ceramic is in form of a blank or a dental restoration.4. The lithium silicate glass ceramic of claim 3 , wherein the blank is shaped into a dental restoration by machining or pressing.5. The lithium silicate glass ceramic of claim 4 , wherein machining comprises grinding claim 4 , trimming or milling.6. The lithium silicate glass ceramic of claim 4 , wherein the dental restoration is an inlay claim 4 , an onlay claim 4 , a bridge claim 4 , an abutment claim 4 , a facing claim 4 , a veneer claim 4 , a facet claim 4 , a crown claim 4 , a partial crown claim 4 , a framework or a coping.7. The lithium silicate glass ceramic of claim 1 , comprising SiO claim 1 , LiO and a nucleating agent.8. A lithium silicate glass ceramic material formed by:{'sub': 2', '2', '2', '2', '3, 'a) heating a starting glass material which is essentially free of ZnO and comprises SiO, LiO, KO, AlO, nucleating agent, and optionally Me(II)O, wherein Me is CaO, BaO, MgO, SrO or combinations thereon, at a first temperature such that nuclei suitable to form lithium metasilicate crystals are formed; and'}b) heating the material from a) at a second temperature which is higher than the first temperature to produce lithium silicate glass ceramic which has lithium metasilicate as the main crystalline phase, and wherein the crystals are of ...

Machining of ceramic materials

Milling strategies for machining dental ceramic materials are provided that reduce milling time while maintaining strength, accuracy and marginal integrity.

Pre-sintered blank for dental purposes

Pre-sintered blanks based on lithium disilicate glass ceramic are described which are suitable in particular for the preparation of dental restorations.

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Lithium disilicate-apatite glass ceramic with transition metal oxide

Lithium disilicate-apatite glass ceramics comprising transition metal oxide are described which are characterized by a high chemical stability, and the translucence of which can be adjusted as desired, and which can therefore be used in particular as restoration material in dentistry.

Machining of ceramic materials

Milling strategies for machining dental ceramic materials are provided that reduce milling time while maintaining strength, accuracy and marginal integrity.

Multi-colored shaped body

The present invention relates to a multi-colored shaped body having layers arranged on top of one another for producing dental restorations, a process for its production and its use for the manufacture of dental restorations.

Lithium silicate glass ceramic and glass with rubidium oxide content

The invention relates to the use of lithium silicate glass ceramics and glasses with rubidium oxide content for coating an oxide ceramic, a metal or an alloy.

Glass Ceramic Having SiO2 As Main Crystal Phase

Glass ceramics having SiO2 as main crystal phase and precursors thereof are described which are characterized by very good mechanical and optical properties and in particular can be used as restoration material in dentistry.

Glass Ceramic Having SiO2 As Main Crystal Phase

Glass ceramics having SiOas main crystal phase and precursors thereof are described which are characterized by very good mechanical and optical properties and in particular can be used as restoration material in dentistry. 2. Process according to claim 1 , wherein the glass ceramic comprises 60.0 to 90.0 wt.-% SiO.3. Process according to claim 1 , wherein the glass ceramic comprises 2.8 to 9.0 wt.-% LiO.4. Process according to claim 1 , wherein the glass ceramic comprises 0 to 13.0 wt.-% further alkali metal oxide MeO.5. Process according to claim 1 , wherein the glass ceramic comprises 0 to 11.0 wt.-% oxide of divalent elements MeO.6. Process according to claim 1 , wherein the glass ceramic comprises 0 to 10.0 wt.-% oxide of trivalent elements MeO.7. Process according to claim 1 , wherein the glass ceramic comprises 0 to 21.0 wt.-% further oxide of tetravalent elements MeO.8. Process according to claim 1 , wherein the glass ceramic comprises 0 to 7.0 wt.-% PO.9. Process according to claim 1 , wherein the glass ceramic comprises 0 to 6.0 wt.-% further oxide of pentavalent elements MeO.10. Process according to claim 1 , wherein the glass ceramic comprises 0 to 6.0 wt.-% oxide of hexavalent elements MeO.11. Process according to claim 1 , wherein the glass ceramic comprises 0 to 5.0 wt.-% fluorine.13. Process according to claim 1 , wherein the glass ceramic comprises low quartz claim 1 , cristobalite or a mixture thereof as main crystal phase.14. Process according to claim 1 , wherein the glass ceramic comprises 5.0 to 50.0 wt.-% SiOas crystal phase.15. Process according to claim 1 , wherein the glass ceramic comprises lithium phosphate and/or lithium silicate as further crystal phase.16. Process according to claim 1 , wherein the glass ceramic is present in the form of a powder claim 1 , a frit claim 1 , a blank or a dental restoration.18. Process according to claim 17 , wherein(a) powder of the starting glass, optionally after the addition of further components, is ...

LITHIUM SILICATE GLASS CERAMIC AND GLASS WITH ZrO2 CONTENT

Lithium silicate glass ceramics and glasses are described which can advantageously be applied to zirconium oxide ceramics in particular by pressing-on in the viscous state and form a solid bond with these. 1) A method comprising:hot pressing i) a monolithic blank comprising lithium disilicate as the main crystalline phase, ii) a monolithic blank comprising lithium metasilicate as the main crystalline phase, or iii) or a monolithic blank with nuclei for lithium metasilicate and/or lithium disilicate formation, wherein a monolithic dental restoration is formed.2) The method of claim 1 , further comprisingforming a monolithic blank with nuclei for lithium metasilicate and/or lithium disilicate formation; andheating the monolithic blank with nuclei for lithium metasilicate and/or lithium disilicate formation to form the monolithic blank comprising lithium disilicate.3) The method of claim 2 , wherein the forming comprises:mixing oxide and/or carbonate precursors and, optionally, at least one coloring pigment;heating the mixture of oxide and/or carbonate precursors to form a first glass melt;contacting the first glass melt with water to form glass granules;melting the glass granules to form a second glass melt;forming a monolithic blank from the second glass melt; andheating the monolithic blank to form a monolithic blank with nuclei for lithium metasilicate and/or lithium disilicate formation.4) The method of claim 1 , further comprising:prior to hot pressing, heating the monolithic blank with nuclei for lithium metasilicate and/or lithium disilicate formation at 650 to 750 ° C. at a heating rate of 15° C./minute to form a monolithic blank comprising lithium metasilicate as the main crystalline phase.5) The method of claim 4 , further comprising:heating the monolithic blank comprising lithium metasilicate as the main crystalline phase at 840 to 880° C. for 5 to 30 minutes to form a monolithic blank comprising lithium disilicate as the main crystalline phase.6) The ...

Sinterable lithium disilicate glass ceramic

High-strength sinterable lithium disilicate glass ceramics are described which can be further processed in particular by pressing in the viscous state to shaped dental products.

Method for preparing dental restorations

The present invention relates to a method for preparing dental restorations from ceramic or polymeric material to achieve color and opacity gradients simulating natural dentition, wherein an ingot of ceramic or polymeric material is entirely or partially forced through a system of channels in a press mold into a mold cavity in the press mold, wherein the mold cavity corresponds to a dental restoration.

GLASS CERAMIC WITH SiO2 AS THE MAIN CRYSTALLINE PHASE

Glass ceramics having SiOas main crystal phase and precursors thereof are described which are characterized by very good mechanical and optical properties and in particular can be used as restoration material in dentistry. 2. Glass ceramic according to claim 1 , which comprises 60.0 to 90.0 wt.-% SiO.3. Glass ceramic according to claim 1 , which comprises 2.8 to 9.0 wt.-% LiO.4. Glass ceramic according to claim 1 , which comprises 0 to 13.0 further alkali metal oxide MeO claim 1 , wherein MeO is selected from NaO claim 1 , KO claim 1 , RbO and/or CsO.5. Glass ceramic according to claim 1 , which comprises 0 to 11.0 wt.-% oxide of divalent elements MeO claim 1 , wherein MeO is selected from MgO claim 1 , CaO claim 1 , SrO and/or ZnO.6. Glass ceramic according to claim 1 , which comprises 0 to 10.0 wt.-% oxide of trivalent elements MeO claim 1 , wherein MeOis selected from AlO claim 1 , BO claim 1 , YO claim 1 , LaO claim 1 , GaOand/or InO.7. Glass ceramic according to claim 1 , which comprises 0 to 21.0 wt.-% further oxide of tetravalent elements MeO claim 1 , wherein MeOis selected from ZrO claim 1 , GeO claim 1 , CeO claim 1 , TiOand/or SnO.8. Glass ceramic according to claim 1 , which comprises 0 to 7.0 wt.-% PO.9. Glass ceramic according to claim 1 , which comprises 0 to 6.0 wt.-% further oxide of pentavalent elements MeO claim 1 , wherein MeOis selected in particular from VO claim 1 , TaOand/or NbO.10. Glass ceramic according to claim 1 , which comprises 0 to 6.0 wt.-% oxide of hexavalent elements MeO claim 1 , wherein MeOis selected from WOand/or MoO.11. Glass ceramic according to claim 1 , which comprises 0 to 5.0 wt.-% fluorine.13. Glass ceramic according to claim 1 , which comprises low quartz claim 1 , cristobalite or a mixture thereof.14. Glass ceramic according to claim 1 , which comprises 5.0 to 50.0 wt.-% SiOas crystal phase claim 1 , in the form of low quartz claim 1 , cristobalite or mixtures thereof.15. Glass ceramic according to claim 1 , which ...

Lithium Silicate Materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Polymerizable composite material

A composite material is described which contains polymerizable monomers plus a special transparent glass having high release of calcium ions and fluorine ions and, because of this release property and in particular of its optical properties, can be used as a restoration material in dentistry.

Lithium Silicate Glass Ceramic and Glass With ZrO2 Content

Lithium silicate glass ceramics and glasses are described which can advantageously be applied to zirconium oxide ceramics in particular by pressing-on in the viscous state and form a solid bond with these. 1. Lithium silicate glass ceramic , which comprises at least 6.1 wt.-% ZrO.2. Lithium silicate glass ceramic according to claim 1 , which comprises 6.1 to 20.0 wt.-% ZrO.3. Lithium silicate glass ceramic according to claim 1 , which comprises 8.0 to 20.0 wt.-%4. Lithium silicate glass ceramic according to claim 1 , which comprises 8.0 to 18.0 wt.-%.5. Lithium silicate glass ceramic according to claim 1 , which comprises 10.0 to 16.0 wt.-% ZrO.6. Lithium silicate glass ceramic according to claim 1 , which comprises lithium metasilicate as a main crystal phase.7. Lithium silicate glass ceramic according to claim 1 , which comprises lithium disilicate as a main crystal phase.8. Lithium silicate glass ceramic according to claim 1 , which comprises 55.0 to 71.0 wt.-% SiO.9. Lithium silicate glass ceramic according to claim 1 , which comprises 60.0 to 69.0 wt.-% SiO.10. Lithium silicate glass ceramic according to claim 1 , which comprises 9.0 to 17.0 wt.-% LiO.11. Lithium silicate glass ceramic according to claim 1 , which comprises 11.0 to 15.0 wt.-% LiO.12. Lithium silicate glass ceramic according to claim 1 , which comprises 0.5 to 12.0 wt.-% nucleating agent claim 1 , wherein the nucleating agent is selected from PO claim 1 , TiO claim 1 , NbOand/or metals.13. Lithium silicate glass ceramic according to claim 1 , which comprises 2.5 to 7.0 wt.-% nucleating agent claim 1 , wherein the nucleating agent is selected from PO claim 1 , TiO claim 1 , NbOand/or metals.14. Lithium silicate glass ceramic according to claim 1 , which comprises further alkali metal oxide in a quantity of 1.0 to 7.0 claim 1 , wherein the further alkali metal oxide is selected from KO claim 1 , CsO and/or RbO.15. Lithium silicate glass ceramic according to claim 1 , which comprises further alkali ...

Lithium silicate glass ceramic and glass with ZrO2 content

Lithium silicate glass ceramics and glasses are described which can advantageously be applied to zirconium oxide ceramics in particular by pressing-on in the viscous state and form a solid bond with these.

Lithium Silicate Glass Ceramic and Glass with ZrO2 Content

Lithium silicate glass ceramics and glasses are described which can advantageously be applied to zirconium oxide ceramics in particular by pressing-on in the viscous state and form a solid bond with these. 1. A process for preparing dental restorations comprising shaping of a lithium silicate glass ceramic by(i) pressing or(ii) machiningto the dental restoration,{'sub': '2', 'wherein the glass ceramic comprises at least 6.1 wt.-% ZrO,'}wherein the glass ceramic comprises lithium disilicate crystals.2. The process according to claim 1 , wherein the glass ceramic comprises more than 10 vol.-% of lithium disilicate crystals.3. The process according to claim 1 , wherein the glass ceramic comprises more than 20 vol.-% of lithium disilicate crystals.4. The process according to claim 1 , wherein the glass ceramic comprises more than 30 vol.-% of lithium disilicate crystals.5. The process according to claim 1 , wherein the dental restorations are selected from inlays claim 1 , onlays claim 1 , crowns claim 1 , veneers claim 1 , facings or abutments.6. The process according to claim 1 , wherein the pressing is conducted at a temperature in the range of from 700 to 1200° C.7. The process according to claim 1 , wherein the pressing is conducted at a pressure in the range of from 2 to 10 bar.8. The process according to claim 1 , wherein the machining is carried out in a CAD/CAM process.9. The process according to claim 1 , wherein after the shaping the glass ceramic is heat treated to convert lithium metasilicate glass ceramic to lithium disilicate glass ceramic.10. The process according to claim 1 , wherein the glass ceramic comprises at least 10.0 wt.-% ZrO.11. The process according to claim 1 , wherein the glass ceramic comprises 55.0 to 71.0 wt.-% SiO.12. The process according to claim 1 , wherein the glass ceramic comprises 9.0 to 17.0 wt.-% LiO.13. The process according to claim 1 , wherein the glass ceramic comprises 0.5 to 12.0 wt.-% nucleating agent claim 1 , and ...

ABUTMENT FOR A DENTAL IMPLANT

Abutment for a dental implant (), with an apical end () and with a coronal end () arranged opposite the apical end in the longitudinal direction. In the area of the apical end (), the abutment has an insert portion () which is designed to be received by an opening of the dental implant and which has an anti-rotation segment () with at least one anti-rotation element () which is designed to cooperate with a corresponding mating anti-rotation element () of the dental implant (). The anti-rotation element () has a groove (″) which, from the edge of the anti-rotation segment () directed toward the apical end (), extends in the coronal longitudinal direction along a groove portion () with a substantially constant groove width. The groove (″) is continuously widened in a transition portion () adjoining the groove portion (), in order to merge into a bevel (″) in a bevel portion () adjoining the transition portion (). 1. An abutment for a dental implant , the abutment comprising an apical end and a coronal end arranged opposite the apical end in the longitudinal direction , which abutment has , in the area of the apical end , an insert portion which is designed to be received by an opening of the dental implant and which has an anti-rotation segment comprising at least one anti-rotation element which is designed to cooperate with a corresponding mating anti-rotation element of the dental implant and comprising a groove which , from the edge of the anti-rotation segment directed toward the apical end , extends in the coronal longitudinal direction along a groove portion with a substantially constant groove width , wherein the groove is continuously widened in a transition portion coronally adjoining the groove portion , in order to merge into a bevel in a bevel portion coronally adjoining the transition portion.2. The abutment as claimed in claim 1 , wherein the anti-rotation element is designed to cooperate with a corresponding projection directed toward the interior of ...

Lithium Silicate Diopside Glass Ceramics

Lithium silicate-diopside glass ceramics are described which are characterized by a controllable translucence and can be satisfactorily processed mechanically and therefore can be used in particular as restoration material in dentistry. 1. Lithium silicate-diopside glass ceramic which comprises lithium silicate as main crystal phase and diopside as further crystal phase.2. Glass ceramic according to claim 1 , which comprises 53.0 to 75.0 wt.-% SiO.3. Glass ceramic according to claim 1 , which comprises 10.0 to 23.0 wt.-% LiO.4. Glass ceramic according to claim 1 , which comprises 1.0 to 13.0 wt.-% CaO and/or 1.0 to 12.0 wt.-% MgO.5. Glass ceramic according to claim 4 , wherein the molar ratio of CaO to MgO is 0.5 to 2.0.6. Glass ceramic according to claim 1 , which comprises 0 to 8.0 O.7. Glass ceramic according to claim 1 , which comprises 0 to 10.0 wt.-% further alkali metal oxide MeO claim 1 , wherein MeO is selected from NaO claim 1 , KO claim 1 , RbO and/or CsO.8. (canceled)9. Glass ceramic according to claim 1 , which comprises 0 to 10.0 wt.-% oxide of trivalent elements MeO claim 1 , wherein MeOis selected from AlO claim 1 , BO claim 1 , YO claim 1 , LaO claim 1 , GaOand/or InO.10. (canceled)11. (canceled)12. (canceled)14. (canceled)15. Glass ceramic according to claim 1 , which comprises lithium silicate in the form of lithium disilicate and/or lithium metasilicate.16. (canceled)17. (canceled)18. (canceled)19. Glass ceramic according to claim 1 , which is present in the form of a blank or a dental restoration.20. Starting glass which comprises the components of the glass ceramic according to .21. Starting glass according to claim 20 , which is present in the form of a ground powder or a compact made of ground powder.22. Process for the preparation of the glass ceramic according to claim 1 , wherein{'claim-ref': {'@idref': 'CLM-00020', 'claim 20'}, '(a) the starting glass according to is ground,'}(b) the ground starting glass is optionally pressed to form a ...

Lithium silicate glass ceramic and glass with ZrO2 content

Lithium silicate glass ceramics and glasses are described which can advantageously be applied to zirconium oxide ceramics in particular by pressing-on in the viscous state and form a solid bond with these. 1. A process for preparing dental restorations comprising shaping of a lithium silicate glass ceramic by(i) pressing or(ii) machiningto the dental restoration,{'sub': '2', 'wherein the glass ceramic comprises at least 6.1 wt.-% ZrO,'}wherein the glass ceramic comprises more than 10 vol.-% of lithium metasilicate crystals or lithium disilicate crystals.2. The process according to claim 1 , wherein the glass ceramic comprises more than 20 vol.-% of lithium metasilicate crystals or lithium disilicate crystals.3. The process according to claim 1 , wherein the glass ceramic comprises more than 30 vol.-% of lithium metasilicate crystals or lithium disilicate crystals.4. The process according to claim 1 , wherein the dental restorations are selected from inlays claim 1 , onlays claim 1 , crowns claim 1 , veneers claim 1 , facings or abutments.5. The process according to claim 1 , wherein the pressing is conducted at a temperature in the range of from 700 to 1200° C.6. The process according to claim 1 , wherein the pressing is conducted at a pressure in the range of from 2 to 10 bar.7. The process according to claim 1 , wherein the machining is carried out in a CAD/CAM process.8. The process according to claim 1 , wherein after the shaping the glass ceramic is heat treated to convert the lithium metasilicate glass ceramic to lithium disilicate glass ceramic.9. The process according to claim 1 , wherein the glass ceramic comprises at least 10.0 wt.-% ZrO.10. The process according to claim 1 , wherein the glass ceramic comprises 55.0 to 71.0 wt.-% SiO.11. The process according to claim 1 , wherein the glass ceramic comprises 9.0 to 17.0 wt.-% LiO.12. The process according to claim 1 , wherein the glass ceramic comprises 0.5 to 12.0 wt.-% nucleating agent claim 1 , and ...

Method for Preparing Dental Restorations

The present invention relates to a method for preparing dental restorations from ceramic or polymeric material to achieve color and opacity gradients simulating natural dentition, wherein an ingot of ceramic or polymeric material is entirely or partially forced through a system of channels in a press mold into a mold cavity in the press mold, wherein the mold cavity corresponds to a dental restoration.

Lithium silicate diopside glass ceramics

Lithium silicate-diopside glass ceramics are described which are characterized by a controllable translucence and can be satisfactorily processed mechanically and therefore can be used in particular as restoration material in dentistry.

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Method For The Preparation Of Glasses And Glass Ceramics With SiO2 As Main Crystal Phase

The invention relates to a method for the preparation of a glass ceramic or a glass, which comprise cerium ions and are suitable in particular for the preparation of dental restorations, the fluorescence properties of which largely correspond to those of natural teeth. 1. Method for the preparation of a dental restoration , which process comprises{'sub': 2', '2, '(a) preparing a glass ceramic with SiOas main crystal phase or a glass which comprises nuclei for the crystallization of SiOin a process which comprises a step in which a melt of a starting glass which comprises cerium ions is exposed to reducing conditions, and'}(b) shaping the glass ceramic or the glass with nuclei by pressing or machining to form the desired dental restoration.2. Method according to claim 1 , wherein the dental restoration is an inlay claim 1 , onlay claim 1 , veneer claim 1 , partial crown claim 1 , crown or facet.3. Method according to claim 1 , wherein the melt of the starting glass is reacted with at least one reducing agent.4. Method according to claim 3 , wherein the at least one reducing agent is a reducing gas.5. Method according to claim 4 , wherein the reducing gas comprises hydrogen or hydrogen and nitrogen.6. Method according to claim 1 , wherein the melt of the starting glass is formed from a glass-forming composition which comprises SiO claim 1 , LiO claim 1 , a cerium compound and at least one reducing agent.7. Method according to claim 3 , wherein the at least one reducing agent is a compound which comprises at least one oxidizable carbon atom.8. Method according to claim 7 , wherein the at least one reducing agent is an acetylacetonate.9. Method according to claim 1 , wherein the starting glass comprises 0.1 to 7.0 wt.-% cerium ions claim 1 , calculated as CeO.10. Method according to claim 1 , wherein the starting glass further comprises terbium ions.11. Method according to claim 10 , wherein the starting glass comprises 0.05 to 2.0 wt.-% terbium ions claim 10 , ...

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Lithium silicate glass ceramics and lithium silicate glass containing cesium oxide

The invention relates to the use of lithium silicate glass ceramics and glasses with caesium oxide content, which are suitable in particular for veneering oxide ceramic restorations and metal restorations.

Process for the preparation of dental restorations

The invention relates to a process for preparing dental restorations, wherein a lithium silicate glass ceramic or a lithium silicate glass is used which contains at least 8.5 wt.-% transition metal oxide selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides.

CeO2-stabilized ZrO2 ceramics for dental applications

The present invention is directed to a porous pre-densified CeO2 stabilized ZrO2 ceramic having a density of 50.0 to 95.0%, relative to the theoretical density of zirconia, and an open porosity of 5 to 50% as well as to ceramic having a density of 97.0 to 100.0%, relative to the theoretical density of zirconia, and wherein the grains of the ceramic have an average grain size of 50 to 1000 nm, methods for the preparation of the pre-densified and densified ceramics and their use for the manufacture of dental restorations.

Lithium Silicate-Wollastonite Glass Ceramic

Lithium silicate-wollastonite glass ceramics are described which are characterized by a controllable translucence and can be easily machined and therefore can be used in particular as restoration material in dentistry. 1. Lithium silicate-wollastonite glass ceramic , which comprises lithium silicate as a crystal phase and wollastonite as a further crystal phase.2. Glass ceramic according to claim 1 , which comprises 55.0 to 74.0 wt.-% SiO.3. Glass ceramic according to claim 1 , which comprises 10.0 to 18.0 wt.-% LiO.4. Glass ceramic according to claim 1 , which comprises 4.0 to 17.0 wt.-% CaO.5. Glass ceramic according to claim 1 , which comprises 0.5 to 6.0 wt.-% AlO.6. Glass ceramic according to claim 1 , which comprises 0 to 5.0 wt.-% KO.7. Glass ceramic according to claim 1 , which comprises 1.0 to 7.0 wt.-% PO.8. Glass ceramic according to claim 1 , which comprises 0 to 13.0 wt.-% further alkali metal oxide MeO claim 1 , wherein MeO is selected from NaO claim 1 , RbO and/or CsO.9. Glass ceramic according to claim 1 , which comprises 0 to 6.0 wt.-% further oxide of divalent elements MeO claim 1 , wherein MeO is selected from MgO claim 1 , SrO and/or ZnO.10. Glass ceramic according to claim 1 , which comprises 0 to 6.0 wt.-% oxide of trivalent elements MeO claim 1 , wherein MeOis selected from BO claim 1 , YO claim 1 , LaOand/or ErO.11. Glass ceramic according to claim 1 , which comprises 0 to 8.0 wt.-% further oxide of tetravalent elements MeO claim 1 , wherein MeOis selected from ZrO claim 1 , GeO claim 1 , CeO claim 1 , TiOand/or SnO.12. Glass ceramic according to claim 1 , which comprises 0 to 6.0 wt.-% further oxide of pentavalent elements MeO claim 1 , wherein MeOis selected from VO claim 1 , TaOand/or NbO.13. Glass ceramic according to claim 1 , which comprises 0 to 6.0 wt.-% oxide of hexavalent elements MeO claim 1 , wherein MeOis selected from WOand/or MoO.15. Glass ceramic according to claim 1 , which comprises lithium disilicate and/or lithium ...

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Multi-colored shaped body

The present invention relates to a multi-colored shaped body having layers arranged on top of one another for producing dental restorations, a process for its production and its use for the manufacture of dental restorations.

Method for the preparation of glasses and glass ceramics with SiO2 as main crystal phase

The invention also relates to a glass ceramic and a glass which can be obtained using the method according to the invention, the use thereof as dental material and in particular for the preparation of dental restorations, as well as a glass-forming composition which is suitable for use in the method according to the invention.

Glass ceramic having SiO2 as main crystal phase

Glass ceramics having SiO 2 as main crystal phase and precursors thereof are described which are characterized by very good mechanical and optical properties and in particular can be used as restoration material in dentistry.

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

LITHIUM SILICATE MATERIALS

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools.

Lithium silicate glass ceramic and glass with transition metal oxide

The invention relates to a lithium silicate glass ceramic, which contains at least 8.5 wt.-% transition metal oxide selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides. The invention also relates to a corresponding lithium silicate glass, a process for the preparation of the glass ceramic and of the glass as well as their use.

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Lithium silicate-low quartz glass ceramic

Lithium silicate-low quartz glass ceramics are described which are characterized by a combination of very good mechanical and optical properties and can therefore be used in particular as restoration material in dentistry.

Phosphosilicate Glass Ceramic

A phosphosilicate glass ceramic with nanoscale fluoroapatite and leucite crystals. The glass ceramic is very similar to natural tooth material in terms of its optical properties. The glass ceramic has a low linear thermal expansion coefficient and a low pressing temperature and is therefore particularly suitable for pressing on metal alloys to produce dental restoration.

Pre-sintered blank for dental purposes

Pre-sintered blanks based on lithium metasilicate glass ceramic are described which are suitable in particular for the preparation of dental restorations.

Low-temperature-sintering potassium-zinc-silicate glass

Potassium-zinc-silicate glasses are described which because of their high chemical stability as well as their optical properties and favorable working properties are suitable in particular as coating or veneering materials for ceramic dental suprastructures and thus for the preparation of all-ceramic dental restorations, such as crowns or bridges.

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Glass Ceramic Having A Quartz Solid Solution Phase

Quartz solid solution glass ceramics and precursors thereof are described, which are characterized by very good mechanical and optical properties and in particular can be used as restoration material in dentistry. 2. Process according to claim 1 , wherein the glass ceramic comprises 38.0 to 49.0 wt.-% SiO.3. Process according to claim 1 , wherein the glass ceramic comprises 26.0 to 38.0 wt.-% AlO.4. Process according to claim 1 , wherein the glass ceramic comprises 6.0 to 14.0 wt.-% MgO.5. Process according to claim 1 , wherein the glass ceramic comprises 14.0 to 18.0 wt.-% ZrO.7. Process according to claim 1 , wherein the glass ceramic comprises the quartz solid solution phase as main crystal phase.8. Process according to claim 1 , wherein the glass ceramic comprises a high-quartz solid solution phase claim 1 , a low-quartz solid solution phase or a mixture thereof.9. Process according to claim 8 , wherein the glass ceramic comprises the high-quartz solid solution phase in a higher amount than the low-quartz solid solution phase.10. Process according to claim 8 , wherein the glass ceramic comprises the high-quartz solid solution phase as main crystal phase.11. Process according to claim 8 , wherein the glass ceramic comprises the low-quartz solid solution phase in a higher amount than the high-quartz solid solution phase.12. Process according to claim 8 , wherein the glass ceramic comprises the low-quartz solid solution phase as main crystal phase.13. Process according to claim 1 , which comprises zirconium oxide as a crystal phase.14. Process according to claim 1 , wherein the glass ceramic is present in the form of a powder or a blank.15. Process according to claim 1 , wherein the glass ceramic is given claim 1 , by machining claim 1 , the shape of the desired dental restoration.16. Process according to claim 1 , wherein the dental restoration is a bridge claim 1 , inlay claim 1 , onlay claim 1 , veneer claim 1 , abutment claim 1 , partial crown claim 1 , crown ...

Method For The Preparation Of Glasses And Glass Ceramics With SiO2 As Main Crystal Phase

The invention relates to a method for the preparation of a glass ceramic or a glass, which comprise cerium ions and are suitable in particular for the preparation of dental restorations, the fluorescence properties of which largely correspond to those of natural teeth. 1. Method for the preparation of a glass ceramic with SiOas main crystal phase or a glass which comprises nuclei for the crystallization of SiO , which comprises a step in which a melt of a starting glass which comprises cerium ions is exposed to reducing conditions.2. Method according to claim 1 , in which the melt of the starting glass is reacted with at least one reducing agent.3. Method according to claim 2 , in which the melt of the starting glass is formed from a glass-forming composition which comprises SiO claim 2 , LiO claim 2 , a cerium compound and at least one reducing agent.4. Method according to claim 2 , in which the at least one reducing agent is a compound which comprises at least one oxidizable carbon atom.5. Method according to claim 4 , in which the at least one reducing agent is an acetylacetonate.6. Method according to claim 2 , in which the at least one reducing agent is a reducing gas.7. Method according to claim 1 , in which the starting glass comprises 0.1 to 7.0 wt.-% cerium ions claim 1 , calculated as CeO.8. Method according to claim 1 , in which the starting glass further comprises terbium ions.9. Method according to claim 1 , in which the starting glass comprises 0 to 11.0 wt.-% alkaline earth metal oxide.11. Method according to for the preparation of a glass with nuclei which are suitable for forming low quartz claim 1 , cristobalite or a mixture thereof.12. Method according to for the preparation of a glass ceramic which has low quartz claim 1 , cristobalite or a mixture thereof as main crystal phase.13. Method according to for the preparation of a glass ceramic which comprises 5.0 to 50.0 wt.-% SiOas crystal phase.14. Method according to claim 1 , in which the ...

Glass ceramic having a quartz solid solution phase

Quartz solid solution glass ceramics and precursors thereof are described, which are characterized by very good mechanical and optical properties and in particular can be used as restoration material in dentistry.

Low temperature-sintering apatite glass ceramic

A low-temperature-sintering apatite glass ceramic is described which is characterized by a high chemical stability, a low coefficient of expansion as well as high translucency and which is particularly suitable on its own or together with glasses or other glass ceramics as coating or veneering material for ceramic dental restorations.

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools.

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

PROCESS FOR THE PREPARATION OF DENTAL RESTORATIONS

The invention relates to a process for preparing dental restorations, wherein a lithium silicate glass ceramic or a lithium silicate glass is used which contains at least 8.5 wt.-% transition metal oxide selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides. 1. Lithium silicate glass ceramic , which comprises at least 14.0 wt.-% transition metal oxide selected from the group consisting of oxides of yttrium , oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides and further comprises lithium metasilicate or lithium disilicate as main crystal phase.2. Glass ceramic according to claim 1 , which comprises more than 5 vol.-% of lithium metasilicate or lithium disilicate crystals.3. Glass ceramic according to claim 1 , which comprises at least 14.0 wt.-% transition metal oxide selected from the group consisting of oxides of Y claim 1 , Nb claim 1 , La claim 1 , Ta claim 1 , W and mixtures of these oxides.4. Glass ceramic according to claim 1 , which comprises 54.0 to 80.0 wt.-% SiO.5. Glass ceramic according to claim 1 , which comprises 11.0 to 19.0 wt.-% LiO.6. Glass ceramic according to claim 1 , which comprises 0.5 to 12.0 wt.-% nucleating agent claim 1 , wherein the nucleating agent is selected from PO claim 1 , TiO claim 1 , and/or metals.7. Glass ceramic according to claim 1 , which comprises further alkali metal oxide in an amount of from 0.5 to 13.5 wt.-% claim 1 , wherein the further alkali metal oxide is KO claim 1 , CsO and/or RbO.8. Glass ceramic according to claim 1 , which comprises up to 6.0 wt.-% alkaline earth metal oxide claim 1 , wherein the alkaline earth metal oxide is CaO claim 1 , BaO claim 1 , MgO and/or SrO claim 1 , and/or comprises up to 6.0 wt.-% ZnO.9. Glass ceramic according to claim 1 , which comprises 0.2 to 8.0 wt.-% oxide of trivalent elements claim 1 , wherein the oxide of trivalent elements is AlOand/or ...

Lithium Silicate-Low Quartz Glass Ceramic

Lithium silicate-low quartz glass ceramics are described which are characterized by a combination of very good mechanical and optical properties and can therefore be used in particular as restoration material in dentistry. 1. Lithium silicate-low quartz glass ceramic , which comprises lithium silicate as main crystal phase and low quartz as further crystal phase.2. Glass ceramic according to claim 1 , which comprises 59.0 to 79.0 wt.-% SiO.3. Glass ceramic according to claim 1 , which comprises 8.0 to 15.0 wt.-% LiO.4. Glass ceramic according to claim 1 , which comprises 0 to 9.0 wt.-% PO.5. Glass ceramic according to claim 1 , which comprises 1.0 to 8.0 wt.-% oxide of monovalent elements MeO selected from the group of KO claim 1 , NaO claim 1 , RbO claim 1 , CsO and mixtures thereof.6. Glass ceramic according to claim 1 , which comprises 0 to 5.0 wt.-% KO.7. Glass ceramic according to claim 1 , which comprises 1.0 to 9.0 wt.-% oxide of divalent elements MeO selected from the group of CaO claim 1 , MgO claim 1 , SrO claim 1 , ZnO and mixtures thereof.8. Glass ceramic according to claim 1 , which comprises 1.0 to 6.0 wt.-% MgO.9. Glass ceramic according to claim 1 , which comprises 0 to 8.0 wt.-% oxide of trivalent elements MeOselected from the group of AlO claim 1 , BO claim 1 , YO claim 1 , LaO claim 1 , GaO claim 1 , InOand mixtures thereof.10. Glass ceramic according to claim 1 , which comprises 1.0 to 6.0 wt.-% AlO.13. Glass ceramic according to claim 1 , which comprises SiOand LiO in a molar ratio in the range of from 2.2 to 4.1.14. Glass ceramic according to claim 1 , which comprises lithium disilicate or lithium metasilicate as main crystal phase.15. Glass ceramic according to claim 1 , which has at least 20 wt.-% lithium disilicate crystals.16. Glass ceramic according to claim 1 , which has 0.2 to 28 wt.-% low quartz crystals.17. Starting glass claim 1 , which comprises nuclei for the crystallization of lithium metasilicate claim 1 , lithium disilicate and/ ...

Lithium Silicate Glass Ceramic and Glass with ZrO2 Content

Lithium silicate glass ceramics and glasses are described which can advantageously be applied to zirconium oxide ceramics in particular by pressing-on in the viscous state and form a solid bond with these. 1) A dental restoration comprising:{'sub': 2', '2', '2, 'a lithium disilicate glass ceramic coated on a zirconium oxide ceramic, wherein the lithium disilicate glass ceramic includes from 55 to 71 weight percent SiO, from 9 to 17 weight percent LiO, and at least 6.1 weight percent ZrObased on a mass of the lithium disilicate glass ceramic, and wherein there are practically no flaws or cracks in the lithium disilicate glass ceramic after the lithium disilicate glass ceramic is coated on the zirconium oxide ceramic.'}2) The dental restoration of claim 1 , wherein the lithium disilicate glass ceramic has a SiO/LiO molar ratio of 1.8 to 3.3) The dental restoration of claim 2 , wherein the lithium disilicate glass ceramic has a SiO/LiO molar ratio of 2 to 2.8.4) The dental restoration of claim 3 , wherein the lithium disilicate glass ceramic has a SiO/LiO molar ratio of 2.1 to 2.6.5) The dental restoration of claim 1 , wherein the lithium disilicate glass ceramic comprises 6.1 to 16 weight percent ZrObased on the mass of the lithium disilicate glass ceramic.6) The dental restoration of claim 5 , wherein the lithium disilicate glass ceramic comprises 6.1 to 14 weight percent ZrObased on the mass of the lithium disilicate glass ceramic.7) The dental restoration of claim 6 , wherein the lithium disilicate glass ceramic comprises 6.1 to 12 weight percent ZrObased on the mass of the lithium disilicate glass ceramic.8) The dental restoration of claim 1 , wherein the zirconium oxide ceramic further comprises at least one oxide of Ce claim 1 , Y claim 1 , Sr claim 1 , Ca claim 1 , or Mg.9) The dental restoration of claim 1 , wherein the lithium disilicate glass ceramic further comprises YO claim 1 , and wherein the lithium disilicate glass ceramic includes a combined amount of ...

Blank for dental purposes

Blanks for dental purposes are described which have at least two layers, bonded to one another, of lithium silicate glasses and glass ceramics, wherein the layers differ in color and the layers are monolithic.

Process for the preparation of shaped translucent lithium disilicate glass ceramic products

A process is described for the preparation of shaped translucent lithium disilicate glass ceramic products which are characterized by high strength and good chemical stability and may be processed by pressing in the plastic state or milling to finished glass ceramic products which may be used in particular as dental restorations.

LITHIUM SILICATE MATERIALS

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength. 1. A lithium silicate glass ceramic for dental restorations which comprises a main crystalline phase comprising lithium metasilicate , wherein the lithium metasilicate crystals comprise lamellar or platelet crystals.2. The lithium silicate glass ceramic of claim 1 , wherein the lithium metasilicate forms more than 50 and up to 80 vol. % of the lithium silicate glass ceramic.3. The lithium silicate glass ceramic of claim 1 , wherein the glass ceramic is in form of a blank or a dental restoration.4. The lithium silicate glass ceramic of claim 3 , wherein the blank is shaped into a dental restoration by machining or pressing.5. The lithium silicate glass ceramic of claim 4 , wherein machining comprises grinding claim 4 , trimming or milling.6. The lithium silicate glass ceramic of claim 4 , wherein the dental restoration is an inlay claim 4 , an onlay claim 4 , a bridge claim 4 , an abutment claim 4 , a facing claim 4 , a veneer claim 4 , a facet claim 4 , a crown claim 4 , a partial crown claim 4 , a framework or a coping.7. The lithium silicate glass ceramic of claim 1 , comprising SiO claim 1 , LiO and a nucleating agent.8. A lithium silicate glass ceramic material formed by:{'sub': 2', '2', '2', '2', '3, 'a) heating a starting glass material which is essentially free of ZnO and comprises SiO, LiO, KO, AlO, nucleating agent, and optionally Me(II)O, wherein Me is CaO, BaO, MgO, SrO or combinations thereon, at a first temperature such that nuclei suitable to form lithium metasilicate crystals are formed; and'}b) heating the material from a) at a second temperature which is higher than the first temperature to produce lithium silicate glass ceramic which has lithium metasilicate as the main crystalline phase, and wherein the crystals are of ...

LITHIUM SILICATE MATERIALS

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength. 1. A lithium silicate glass ceramic for dental restorations which comprises a main crystalline phase comprising lithium metasilicate , wherein the lithium metasilicate crystals comprise lamellar or platelet crystals.2. The lithium silicate glass ceramic of claim 1 , wherein the lithium metasilicate forms more than 50 and up to 80 vol. % of the lithium silicate glass ceramic.3. The lithium silicate glass ceramic of claim 1 , wherein the glass ceramic is in form of a blank or a dental restoration.4. The lithium silicate glass ceramic of claim 3 , wherein the blank is shaped into a dental restoration by machining or pressing.5. The lithium silicate glass ceramic of claim 4 , wherein machining comprises grinding claim 4 , trimming or milling.6. The lithium silicate glass ceramic of claim 4 , wherein the dental restoration is an inlay claim 4 , an onlay claim 4 , a bridge claim 4 , an abutment claim 4 , a facing claim 4 , a veneer claim 4 , a facet claim 4 , a crown claim 4 , a partial crown claim 4 , a framework or a coping.7. The lithium silicate glass ceramic of claim 1 , comprising SiO claim 1 , LiO and a nucleating agent.8. A lithium silicate glass ceramic material formed by:{'sub': 2', '2', '2', '2', '3, 'a) heating a starting glass material which is essentially free of ZnO and comprises SiO, LiO, KO, AlO, nucleating agent, and optionally Me(II)O, wherein Me is CaO, BaO, MgO, SrO or combinations thereon, at a first temperature such that nuclei suitable to form lithium metasilicate crystals are formed; and'}b) heating the material from a) at a second temperature which is higher than the first temperature to produce lithium silicate glass ceramic which has lithium metasilicate as the main crystalline phase, and wherein the crystals are of ...

LITHIUM SILICATE GLASS CERAMIC AND GLASS WITH RUBIDIUM OXIDE CONTENT

The invention relates to the use of lithium silicate glass ceramics and glasses with rubidium oxide content for coating an oxide ceramic, a metal or an alloy. 1. (canceled)3. Process according to claim 2 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 58.0 to 72.0 wt.-% SiO.4. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 3.7 to 7.7 wt. % RbO.5. Process according to claim 4 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 2.5 to 4.0 wt. % AlO.6. Process according to claim 5 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 2.5 wt.-% CsO.7. Process according to claim 6 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 4.0 wt.-% NaO and/or KO.8. Process according to claim 7 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 3.8 wt.-% BaO.9. Process according to claim 8 , in which a lithium silicate glass ceramic is used which comprises lithium metasilicate as main crystal phase and preferably has a bending strength in the range of about 180 to 300 MPa and/or a fracture toughness claim 8 , measured as Kvalue claim 8 , of at least about 2.0 MPa·m.10. Process according to claim 9 , in which a lithium silicate glass ceramic is used which comprises lithium disilicate as main crystal phase and has a bending strength in the range of about 400 to 700 MPa and/or a fracture toughness claim 9 , measured as Kvalue claim 9 , of at least about 2.0 MPa·m.11. Process according to claim 8 , in which a lithium silicate glass is used claim 8 , wherein the lithium silicate glass comprises nuclei which are suitable for forming lithium metasilicate and/or lithium disilicate crystals.12. Process according to claim 15 , in which the substrate is an oxide ceramic and comprises a zirconium oxide ceramic.13. Process ...

Lithium disilicate glass ceramics dental product

High-strength sinterable lithium disilicate glass ceramics are described which can be further processed in particular by pressing in the viscous state to shaped dental products.

CeO2-stabilized ZrO2 ceramics for dental applications

The present invention is directed to a porous pre-densified CeO2-stabilized ZrO2 ceramic having a density of 50.0 to 95.0%, relative to the theoretical density of zirconia, and an open porosity of 5 to 50% as well as to a densified CeO2-stabilized ZrO2 ceramic having a density of 97.0 to 100.0%, relative to the theoretical density of zirconia, and wherein the grains of the ceramic have an average grain size of 50 to 1000 nm, methods for the preparation of the pre-densified and densified ceramics and their use for the manufacture of dental restorations.

Lithium silicate-low quartz glass ceramic

Lithium silicate-low quartz glass ceramics are described which are characterized by a combination of very good mechanical and optical properties and can therefore be used in particular as restoration material in dentistry.

Lithium Silicate Materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools.

Lithium Silicate Materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools. 1. A process for manufacturing a lithium silicate dental glass-ceramic article comprising: preparing a lithium silicate blank comprising lithium metasilicate as the main crystalline phase and exhibiting a flexural strength of greater than 180 MPa; machining the lithium silicate blank into a dental article; and heat treating the machined dental article in the temperature range of from about 350° C. to about 850° C.2. A process for manufacturing a lithium silicate dental glass-ceramic article comprising:preparing a lithium silicate blank comprising lithium metasilicate as the main crystalline phase and exhibiting a flexural strength of greater than 180 MPa; machining the lithium silicate blank into a dental article; and applying a coating thereon.3. The process of claim 2 , wherein the coating comprises glass or a glass ceramic.4. A process for the preparation of a lithium silicate blank claim 2 , which comprises:{'sub': 2', '2', '2', '2', '3', '2', '5, 'producing a melt of a starting glass containing the initial components SiOLiO, KO, AlOand POor other nucleation agent as the main components,'}pouring the melt of the starting glass into a mold to form a starting glass blank,subjecting the starting glass blank to heat treatment to obtain the lithium silicate blank with lithium metasilicate crystals as the main crystalline phase by heating the glass blank to a temperature in the range from about 450° C. to about 700° C. for a time between about 5 minutes and about 1 hour, andcooling the lithium silicate blank having the lithium metasilicate crystals as the main crystalline phase. This application is a continuation of U.S. patent application Ser. No. 13/834,526, filed Mar. 15, 2013, which is a divisional application of U.S. patent application Ser. No. 12/833,721, filed Jul. 9, 2010, now U.S. Pat. No. 8,444,756, which is a continuation- ...

LITHIUM SILICATE MATERIALS

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength. 1. A lithium silicate glass ceramic for dental restorations , wherein the lithium silicate glass ceramic comprises:{'sub': '2', 'SiOfrom 64 to 75 wt %; and'}a main crystalline phase of lithium disilicate;wherein the lithium silicate glass ceramic has a biaxial flexural strength of 450-820 MPa and is formed in the shape of a blank suitable for producing a dental restoration.2. The lithium silicate glass ceramic of claim 1 , comprising 64 to 73 wt % of SiO.3. The lithium silicate glass ceramic of claim 1 , wherein the blank is shaped into a dental restoration by machining or pressing.4. The lithium silicate glass ceramic of claim 3 , wherein machining comprises grinding claim 3 , trimming claim 3 , or milling.5. The lithium silicate glass ceramic of claim 1 , wherein the dental restoration is an inlay claim 1 , an onlay claim 1 , a bridge claim 1 , an abutment claim 1 , a facing claim 1 , a veneer claim 1 , a facet claim 1 , a crown claim 1 , a partial crown claim 1 , a framework or a coping. This application is a continuation of U.S. application Ser. No. 16/284,563, filed on Feb. 25, 2019, which is a continuation of U.S. application Ser. No. 15/255,443, filed on Sep. 2, 2016, now U.S. Pat. No. 10,214,443, issued on Feb. 26, 2019, which is a continuation of U.S. application Ser. No. 14/567,173, filed on Dec. 11, 2014, now U.S. Pat. No. 9,434,639, issued on Sep. 6, 2016, which is a continuation of U.S. application Ser. No. 13/940,362, filed on Jul. 7, 2013, now U.S. Pat. No. 8,940,651, issued on Jan. 27, 2015, which is a continuation of U.S. application Ser. No. 13/175,370, filed on Jul. 1, 2011, now U.S. Pat. No. 8,546,280, issued on Oct. 1, 2013, which is a continuation of U.S. application Ser. No. 12/944,578, filed on Nov. 11, 2010, now U.S. ...

PRE-SINTERED BLANK FOR DENTAL PURPOSES

Pre-sintered blanks based on lithium metasilicate glass ceramic are described which are suitable in particular for the preparation of dental restorations. 1. Pre-sintered blank for dental purposes based on lithium metasilicate glass ceramic , wherein the blank has a relative density of from 66 to 90% relative to a blank of same composition that has been fully sintered to a lithium disilicate glass ceramic and wherein the pre-sintered blank has layers which differ in color or translucence.2. Pre-sintered blank according to claim 1 , wherein the relative density is from 68 to 88% claim 1 , relative to a blank of same composition that has been fully sintered to a lithium disilicate glass ceramic.3. Pre-sintered blank according to claim 1 , wherein the relative density is from 70 to 86% claim 1 , relative to a blank of same composition that has been fully sintered to a lithium disilicate glass ceramic.4. Pre-sintered blank according to claim 1 , wherein the layers comprise at least three layers.5. Pre-sintered blank according to claim 1 , wherein the layers comprise up to ten layers.6. Pre-sintered blank according to claim 1 , wherein the layers have a color gradient to ensure continuous color transition.7. Pre-sintered blank according to claim 1 , which consists substantially of lithium metasilicate glass ceramic.8. Pre-sintered blank according to claim 1 , wherein the glass ceramic includes lithium metasilicate as main crystal phase and contains more than 20 vol.-% lithium metasilicate crystals.9. Pre-sintered blank according to claim 8 , wherein the glass ceramic contains more than 25 vol.-% lithium metasilicate crystals.10. Pre-sintered blank according to claim 8 , wherein the glass ceramic contains more than 30 vol.-% lithium metasilicate128. Pre-sintered blank according to claim 1 , which has a holder for a processing device.13. Pre-sintered blank according to claim 1 , which has an interface in the form of a recess claim 1 , for connection to a dental implant.14. ...

Low temperature-sintering apatite glass ceramic

A low-temperature-sintering apatite glass ceramic is described which is characterized by a high chemical stability, a low coefficient of expansion as well as high translucency and which is particularly suitable on its own or together with glasses or other glass ceramics as coating or veneering material for ceramic dental restorations.

Abutment for a dental implant

Abutment for a dental implant (50), with an apical end (4) and with a coronal end (6) arranged opposite the apical end in the longitudinal direction. In the area of the apical end (4), the abutment has an insert portion (8) which is designed to be received by an opening of the dental implant and which has an anti-rotation segment (10) with at least one anti-rotation element (27) which is designed to cooperate with a corresponding mating anti-rotation element (53) of the dental implant (50). The anti-rotation element (27) has a groove (18, 18) which, from the edge of the anti-rotation segment (10) directed toward the apical end (4), extends in the coronal longitudinal direction along a groove portion (14) with a substantially constant groove width. The groove (18, 18) is continuously widened in a transition portion (20) adjoining the groove portion (14), in order to merge into a bevel (24, 24) in a bevel portion (22) adjoining the transition portion (20).

Method of controlling an oven

A method of controlling an oven for producing tooth replacement components. An electric motor moves a piston that acts upon a moldable restoration material. The restoration material is introduced into a muffle oven having an oven hood that can be removed from the muffle. The compactibility curve is established as a function of the type of dental material utilized. Immediately after conclusion of the mold time, the motor is turned off and the oven hood is removed.

Pre-sintered blank for dental purposes

Pre-sintered blanks based on lithium metasilicate glass ceramic are described which are suitable in particular for the preparation of dental restorations.

Machining of Ceramic Materials

Milling strategies for machining dental ceramic materials are provided that reduce milling time while maintaining strength, accuracy and marginal integrity. 1. A block for machining a dental article comprisinga block comprising a first pre-drilled hole on a first surface and second pre-drilled hole on a second surface, the second surface opposing the first surface;wherein the first and second pre-drilled holes provide space for insertion of a drill tool;wherein the first hole is deeper than the second hole;wherein the first hole allows the insertion of a drill into greater than half an entire depth of the block.2. A block for machining a dental article as claimed in wherein the first hole provides access to an interior of the block for drilling the undersurface of a dental article.3. A block for machining a dental article as claimed in wherein the second hole provides access to an interior of the block for drilling the exterior surface of a dental article.4. A block for machining a dental article as claimed in wherein the exterior surface of a dental article comprises the occlusal area of a dental article.5. A block for machining a dental article as claimed in wherein the dental article comprises an inlay claim 1 , an onlay claim 1 , a bridge claim 1 , an abutment claim 1 , a facing claim 1 , a veneer claim 1 , a facet claim 1 , a crown claim 1 , a partial crown claim 1 , a framework or a coping.6. A method for machining a dental article comprisingproviding a block comprising a first pre-drilled hole on a first surface and second pre-drilled hole on a second surface, the second surface opposing the first surface, wherein the first and second pre-drilled holes provide space for insertion of a drill tool, wherein the first hole is deeper than the second hole, wherein the first hole allows the insertion of a drill into greater than half an entire depth of the block,inserting a drill through the first pre-drilled hole;drilling a first side of a dental article through ...

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools.

Lithium Silicate-Low Quartz Glass Ceramic

Lithium silicate-low quartz glass ceramics are described which are characterized by a combination of very good mechanical and optical properties and can therefore be used in particular as restoration material in dentistry.

Low-temperature-sintering potassium-zinc-silicate glass

Potassium-zinc-silicate glasses are described which because of their high chemical stability as well as their optical properties and favorable working properties are suitable in particular as coating or veneering materials for ceramic dental suprastructures and thus for the preparation of all-ceramic dental restorations, such as crowns or bridges.

METHOD FOR THE PREPARATION OF LITHIUM SILICATE GLASSES AND LITHIUM SILICATE GLASS CERAMICS

The invention relates to a method for the preparation of a lithium silicate glass or a lithium silicate glass ceramic which comprise cerium ions and are suitable in particular for the preparation of dental restorations, the fluorescence properties of which largely correspond to those of natural teeth. 1. Method for the preparation of a lithium silicate glass , a lithium silicate glass with nuclei which are suitable for forming lithium metasilicate and/or lithium disilicate crystals , or a lithium silicate glass ceramic , which comprises a step in which a melt of a starting glass which comprises cerium ions is reacted with at least one reducing gas.2. Method according to claim 1 , wherein the gas comprises hydrogen or comprises hydrogen and nitrogen.3. Method according to claim 1 , in which the starting glass comprises up to 5.0 wt.-% alkaline earth metal oxide.4. Method according to claim 3 , wherein the alkaline earth metal oxide is CaO claim 3 , BaO claim 3 , MaO claim 3 , SrOor a mixture thereof.7. Method according to claim 1 , in which the starting glass furthermore comprises terbium ions.8. Method according to for the preparation of a lithium silicate glass with nuclei which are suitable for forming lithium metasilicate and/or lithium disilicate crystals.9. Method according to for the preparation of a lithium silicate glass ceramic which comprises lithium metasilicate as main crystal phase and/or comprises more than 10 vol.-% lithium metasilicate crystals.10. Method according to claim 9 , wherein the lithium metasilicate glass ceramic comprises more than 20 vol.-% lithium metasilicate crystals.11. Method according to for the preparation of a lithium silicate glass ceramic which comprises lithium disilicate as main crystal phase and/or comprises more than 10 vol.-% lithium disilicate crystals.12. Method according to claim 11 , wherein the lithium silicate glass ceramic comprises more than 20 vol.-% lithium disilicate crystals.13. Method according to claim 1 , in ...

Lithium Silicate Glass Ceramic And Glass With Transition Metal Oxide

The invention relates to a lithium silicate glass ceramic, which contains at least 8.5 wt.-% transition metal oxide selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides. The invention also relates to a corresponding lithium silicate glass, a process for the preparation of the glass ceramic and of the glass as well as their use. 1. Lithium silicate glass ceramic , which comprises at least 8.5 wt.-% transition metal oxide selected from the group consisting of oxides of yttrium , oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides.2. Glass ceramic according to claim 1 , which comprises more than 5 vol. % of lithium metasilicate or lithium disilicate crystals.3. Glass ceramic according to claim 1 , which comprises at least 8.5 wt.-% transition metal oxide selected from the group consisting of oxides of Y claim 1 , Nb claim 1 , La claim 1 , Ta claim 1 , W and mixtures of these oxides.4. Glass ceramic according to claim 1 , which comprises 54.0 to 80.0 wt.-% SiO.5. Glass ceramic according to claim 1 , which comprises 11.0 to 19.0 wt.-% LiO.6. Glass ceramic according to claim 1 , which comprises 0.5 to 12.0 wt.-% nucleating agent claim 1 , wherein the nucleating agent is selected from PO claim 1 , TiO claim 1 , and/or metals.7. Glass ceramic according to claim 1 , which comprises further alkali metal oxide in an amount of from 0.5 to 13.5 wt.-% claim 1 , wherein the further alkali metal oxide is KO claim 1 , CsO and/or RbO.8. Glass ceramic according to claim 1 , which comprises up to 6.0 wt.-% alkaline earth metal oxide claim 1 , wherein the alkaline earth metal oxide is CaO claim 1 , BaO claim 1 , MgO and/or SrO claim 1 , and/or comprises up to 6.0 wt.-% ZnO.9. Glass ceramic according to claim 1 , which comprises 0.2 to 8.0 wt.-% oxide of trivalent elements claim 1 , wherein the oxide of trivalent elements is AlOand/or BiO.10. Glass ...

Method for the preparation of lithium silicate glasses and lithium silicate glass ceramics

The invention relates to a method for the preparation of a lithium silicate glass or a lithium silicate glass ceramic which comprise cerium ions and are suitable in particular for the preparation of dental restorations, the fluorescence properties of which largely correspond to those of natural teeth. The invention also relates to a lithium silicate glass and a lithium silicate glass ceramic which can be obtained using the method according to the invention, the use thereof as dental material and in particular for the preparation of dental restorations, as well as a glass-forming composition which is suitable for use in the method according to the invention.

Process for the preparation of dental restorations

The invention relates to a process for preparing dental restorations, wherein a lithium silicate glass ceramic or a lithium silicate glass is used which contains at least 8.5 wt.-% transition metal oxide selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides.

Lithium silicate glass ceramic and glass with ZrO2 content

Lithium silicate glass ceramics and glasses are described which can advantageously be applied to zirconium oxide ceramics in particular by pressing-on in the viscous state and form a solid bond with these.

MACHINING OF CERAMIC MATERIALS

Milling strategies for machining dental ceramic materials are provided that reduce milling time while maintaining strength, accuracy and marginal integrity. 1. A block for machining a dental article comprisinga block comprising a first pre-drilled hole on a first surface and second pre-drilled hole on a second surface, the second surface opposing the first surface;wherein the first and second pre-drilled holes provide space for insertion of a drill tool;wherein the first hole is deeper than the second hole;wherein the first hole allows the insertion of a drill into greater than half an entire depth of the block.2. A block for machining a dental article as claimed in wherein the first hole provides access to an interior of the block for drilling the undersurface of a dental article.3. A block for machining a dental article as claimed in wherein the second hole provides access to an interior of the block for drilling the exterior surface of a dental article.4. A block for machining a dental article as claimed in wherein the exterior surface of a dental article comprises the occlusal area of a dental article.5. A block for machining a dental article as claimed in wherein the dental article comprises an inlay claim 1 , an onlay claim 1 , a bridge claim 1 , an abutment claim 1 , a facing claim 1 , a veneer claim 1 , a facet claim 1 , a crown claim 1 , a partial crown claim 1 , a framework or a coping. This application is a continuation application of U.S. patent application Ser. No. 13/467,260, filed May 9, 2012, which is a continuation-in-part of U.S. patent application Ser. No. 13/096,367, filed Apr. 28, 2011, which is a continuation of U.S. patent application Ser. No. 12/562,348, filed Sep. 18, 2009, now U.S. Pat. No. 7,955,159, which is a continuation in part of U.S. patent application Ser. No. 11/935,203, filed Nov. 5, 2007, now U.S. Pat. No. 8,042,358, which is of division of U.S. patent application Ser. No. 10/913,095, filed Aug. 6, 2004, now U.S. Pat. No. 7,316, ...

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools.

Multi-Colored Shaped Body

The present invention relates to a multi-colored shaped body having layers arranged on top of one another for producing dental restorations, a process for its production and its use for the manufacture of dental restorations.

Method For The Preparation Of Lithium Silicate Glasses And Lithium Silicate Glass Ceramics

The invention relates to a method for the preparation of a lithium silicate glass or a lithium silicate glass ceramic which comprise cerium ions and are suitable in particular for the preparation of dental restorations, the fluorescence properties of which largely correspond to those of natural teeth. 1. Method for the preparation of a lithium silicate glass or a lithium silicate glass ceramic , which comprises a step in which a melt of a starting glass which comprises cerium ions is exposed to reducing conditions.2. Method according to claim 1 , in which the melt of the starting glass is reacted with at least one reducing agent.3. Method according to claim 2 , in which the melt of the starting glass is formed from a glass-forming composition which comprises SiO claim 2 , LiO claim 2 , nucleating agent claim 2 , a cerium compound and at least one reducing agent.4. Method according to claim 3 , in which the at least one reducing agent is a compound which comprises at least one oxidizable carbon atom and is selected from the group consisting of organic salts claim 3 , carbohydrates and cereal flours.5. Method according to claim 4 , in which the at least one reducing agent is an acetylacetonate.6. Method according to claim 2 , in which the at least one reducing agent is a reducing gas claim 2 , wherein the gas comprises hydrogen or hydrogen and nitrogen.7. Method according to claim 6 , in which the starting glass comprises up to 5.0 wt.-% alkaline earth metal oxide claim 6 , wherein the alkaline earth metal oxide comprises CaO claim 6 , BaO claim 6 , MgO claim 6 , SrO or a mixture thereof.9. Method according to claim 8 , in which the starting glass furthermore comprises terbium ions.10. Method according to for the preparation of a lithium silicate glass with nuclei which are suitable for forming lithium metasilicate and/or lithium disilicate crystals.11. Method according to for the preparation of a lithium silicate glass ceramic which comprises lithium metasilicate as ...

Machining of Ceramic Materials

Milling strategies for machining dental ceramic materials are provided that reduce milling time while maintaining strength, accuracy and marginal integrity.

CeO2-Stabilized ZrO2 Ceramics For Dental Applications

The present invention is directed to a porous pre-densified CeO-stabilized ZrOceramic having a density of 50.0 to 95.0%, relative to the theoretical density of zirconia, and an open porosity of 5 to 50% as well as to a densified CeO-stabilized ZrOceramic having a density of 97.0 to 100.0%, relative to the theoretical density of zirconia, and wherein the grains of the ceramic have an average grain size of 50 to 1000 nm, methods for the preparation of the pre-densified and densified ceramics and their use for the manufacture of dental restorations. 1. Densified CeO-stabilized ZrOceramic having a density of 97.0 to 100.0% , relative to the theoretical density of zirconia , and wherein the grains of the ceramic have an average grain size of 50 to 1000 nm.2. Densified ceramic according to having a density of 98.0 to 100.0%.3. Densified ceramic according to claim 1 , wherein the grains of the ceramic have an average grain size of 100 to 800 nm.4. Densified ceramic according to comprising tetragonal ZrOin an amount of 90 to 100 vol.-% based on the total volume of crystals of the densified ceramic.5. Densified ceramic according to claim 1 , wherein the pores of the ceramic have a mean pore diameter of less than 150 nm.6. Densified ceramic according to having an open porosity of less than 1% and/or a closed porosity of less than 1%.7. Densified ceramic according to having a density of 99.5 to 100.0%.8. Densified ceramic according to having a density of about 100.0%.9. Densified ceramic according to claim 3 , wherein the grains of the ceramic have an average grain size of 400 to 700 nm.10. Densified ceramic according to comprising tetragonal ZrOin an amount of 95 to 100 vol.-% claim 4 , based on the total volume of crystals of the densified ceramic.11. Densified ceramic according to comprising tetragonal ZrOin an amount of about 100 vol.-% claim 4 , based on the total volume of crystals of the densified ceramic.12. Densified ceramic according to claim 5 , wherein the pores of ...

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Machining of ceramic materials

Milling strategies for machining dental ceramic materials are provided that reduce milling time while maintaining strength, accuracy and marginal integrity.

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools.

Lithium Silicate Materails

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Process for the Preparation of Dental Restorations

The invention relates to a process for preparing dental restorations, wherein a lithium silicate glass ceramic or a lithium silicate glass is used which contains at least 8.5 wt.-% transition metal oxide selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides.

Lithium Silicate Materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools. 1. A process for manufacturing a lithium silicate dental glass-ceramic article comprising:preparing a lithium silicate blank comprising lithium metasilicate as the main crystalline phase and exhibiting a flexural strength of greater than 180 MPa; andmachining the lithium silicate blank into a dental article.2. The process of further comprising coating the machined dental article.3. The process of further comprising heat treating the machined dental article.4. The process of claim 1 , wherein the step of preparing the lithium silicate blank comprises:{'sub': 2', '2', '2', '5, 'melting a starting glass containing the initial components SiO, LiO and POor other nucleating agent, as the main components;'}forming the molten glass into shaped blanks;subjecting the glass blanks to one or more heat treatments to convert the glass blanks into machinable glass-ceramic blanks comprising lithium metasilicate as the main crystalline phase.5. The process of wherein the starting glass is melted at a temperature within the range of about 1300° C. to about 1600° C.6. The process of wherein the one or more heat treatments to convert the glass blanks into machinable glass-ceramic blanks is/are in the temperature range of from about 450° C. to about 830° C.7. The process of wherein further heat treating the machined dental article is in the temperature range of from about 350° C. to about 850° C.8. The process of wherein the flexural strength is in the range of about 190 to about 400 MPa.9. The process of wherein the lithium silicate blank exhibits a fracture toughness of less than about 2.0 MPam.10. The process of wherein the fracture toughness is less than about 1.5 MPam.11. The process of wherein the machinable phase comprises lamellar or platelet crystals.12. The process of wherein the machinable lithium silicate dental glass-ceramic article further ...

Lithium Silicate Materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength. 1. A lithium silicate glass ceramic for dental restorations which comprises:an intermediate phase having a main crystalline phase comprising lithium metasilicate, and wherein the lithium metasilicate comprises lamellar or platelet crystals; anda final phase having a biaxial strength greater than 400 MPa.2. The lithium silicate glass ceramic of claim 1 , wherein the lithium metasilicate forms more than 50 and up to 80 vol.-% of the lithium silicate glass ceramic.3. The lithium silicate glass ceramic of claim 1 , wherein the glass ceramic is in form of a blank or a dental restoration.4. The lithium silicate glass ceramic of claim 3 , wherein the blank is shaped into a dental restoration by machining or pressing.5. The lithium silicate glass ceramic of claim 4 , wherein machining comprises grinding claim 4 , trimming or milling.6. The lithium silicate glass ceramic of claim 4 , wherein the dental restoration is an inlay claim 4 , an onlay claim 4 , a bridge claim 4 , an abutment claim 4 , a facing claim 4 , a veneer claim 4 , a facet claim 4 , a crown claim 4 , a partial crown claim 4 , a framework or a coping.7. The lithium silicate glass ceramic of claim 1 , wherein the biaxial strength of the final phase is in a range of greater than 400 MPa to about 900 MPa.8. The lithium silicate glass ceramic of claim 1 , wherein the final phase comprises lithium disilicate.9. The lithium silicate glass ceramic of claim 1 , comprising SiO claim 1 , LiO and a nucleating agent. This application is a continuation of U.S. application Ser. No. 13/175,370, filed on Jul. 1, 2011, which is a continuation of U.S. application Ser. No. 12/944,578, filed Nov. 11, 2010, now U.S. Pat. No. 7,993,137, which is a continuation of U.S. patent application Ser. No. 12/253,437 ...

Lithium disilicate-apatite glass-ceramic

Lithium disilicate apatite glass-ceramics are described which are characterized by a high chemical stability and can therefore be used in particular as restoration material in dentistry.

LITHIUM SILICATE MATERIALS

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools. 1. A lithium silicate dental glass-ceramic article comprising a machinable phase comprising lithium metasilicate as the main crystalline phase and exhibiting a flexural strength of greater than 180 MPa.2. The lithium silicate dental glass-ceramic article of wherein flexural strength comprises biaxial claim 1 , 3-point bend or 4-point bend strength.3. A process for manufacturing a lithium silicate dental glass-ceramic article comprising:preparing a lithium silicate blank comprising a machinable phase comprising lithium metasilicate as the main crystalline phase and exhibiting a flexural strength of greater than 180 MPa; andmachining the lithium silicate blank into a dental article.4. The process of wherein flexural strength comprises biaxial claim 3 , 3-point bend or 4-point bend strength. This application is a continuation of U.S. patent application Ser. No. 14/984,490, filed on Dec. 30, 2015, which is a continuation of U.S. patent application Ser. No. 13/834,526, filed Mar. 15, 2013, now U.S. Pat. No. 9,248,078, filed Mar. 15, 2013, which is a divisional application of U.S. patent application Ser. No. 12/833,721, filed Jul. 9, 2010, now U.S. Pat. No. 8,444,756, which is a continuation-in-part application of U.S. patent application Ser. No. 12/509,959, filed Jul. 27, 2009, now U.S. Pat. No. 7,816,291 which is a continuation of U.S. patent application Ser. No. 11/935,203, filed Nov. 5, 2007, now U.S. Pat. No. 8,047,021 which is a division of U.S. patent application Ser. No. 10/913,095, filed Aug. 6, 2004, now U.S. Pat. No. 7,316,740, which claims priority to German Patent Application No. 103 36 913, filed Aug. 7, 2003, and U.S. patent application Ser. No. 12/833,721, filed Jul. 9, 2010, now U.S. Pat. No. 8,444,756 is also a continuation-in-part application of U.S. patent application Ser. No. 12/253,437, filed Oct. 17, 2008, now U.S. ...

CONTROLLING OF SINTERING KINETICS OF OXIDE CERAMICS

The invention relates to multi-layer oxide ceramic bodies and in particular to presintered multi-layer oxide ceramic blanks and oxide ceramic green bodies suitable for dental applications. These bodies can be thermally densified by further sintering without distortion and are thus particularly suitable for the manufacture of dental restorations. The invention also relates to a process for the manufacture of such multi-layer oxide ceramic bodies as well as to a process for the manufacture of dental restorations using the multi-layer oxide ceramic bodies. 1. Process for the manufacture of a multi-layer oxide ceramic body having at least two different layers which body can be sintered without distortion , wherein the process comprises aligning a sintering behavior of the different layers.2. Process according to claim 1 , wherein the body is suitable for the manufacture of a multi-unit dental restoration comprising two or more units.3. Process according to claim 1 , wherein the at least two different layers differ in terms of chemical composition.4. Process according to claim 1 , wherein the at least two different layers have different colors and wherein the colors are in the range of the colors of natural teeth.5. Process according to claim 1 , wherein the sintering behavior is the relative linear shrinkage upon sintering at a temperature in the range of 850 to 1350° C.6. Process according to claim 1 , which process comprises(a) providing at least a first oxide ceramic material and a second oxide ceramic material, wherein the first oxide ceramic material and the second oxide ceramic material differ in terms of a sintering behavior; and(b) adapting at least one of the oxide ceramic materials to align the sintering behavior of the first oxide ceramic material to the sintering behavior of the second oxide ceramic material.7. Process according to claim 6 , wherein in step (a) the sintering behavior of the first oxide ceramic material and the sintering behavior of the ...

PRE-SINTERED BLANK FOR DENTAL PURPOSES

Pre-sintered blanks based on lithium disilicate glass ceramic are described which are suitable in particular for the preparation of dental restorations. 1. Pre-sintered blank for dental purposes based on lithium disilicate glass ceramic , wherein the blank has a relative density of from 60 to 90% , relative to the true density of the glass ceramic.2. Pre-sintered blank according to claim 1 , which consists substantially of lithium disilicate glass ceramic.3. Pre-sintered blank according to claim 1 , wherein the glass ceramic includes lithium disilicate as main crystal phase and contains more than 10 vol. % lithium disilicate crystals.5. Pre-sintered blank according to claim 1 , which has at least two areas which differ by their coloration or translucence.6. Pre-sintered blank according to claim 1 , which has a holder for a processing device.7. Pre-sintered blank according to claim 1 , which has an interface claim 1 , in particular in the form of a recess claim 1 , for connection to a dental implant.8. Pre-sintered blank according to claim 1 , which is obtainable by the process in which(a) lithium silicate glass in powder or granulate form is pressed to form a glass blank, (i) is at least 500° C., and', '(ii) lies in a range which extends over at least 30K, and in which the relative density varies by less than 2.5%., '(b) the glass blank is heat-treated in order to prepare a pre-sintered blank based on lithium disilicate glass ceramic, wherein the temperature of the heat treatment'}9. Pre-sintered blank according to claim 1 , which has a relative density which results when(a) powder of a corresponding starting glass with an average particle size of <100 μm, relative to the number of particles, is uniaxially or isostatically pressed at a pressure of from 20 MPa to 200 MPa, preferably 40 to 120 MPa and particularly preferably 50 to 100 MPa and (i) is at least 500° C., in particular at least 540° C. and preferably at least 580° C., and', '(ii) lies in a range which ...

PRE-SINTERED BLANK FOR DENTAL PURPOSES

Pre-sintered blanks based on lithium metasilicate glass ceramic are described which are suitable in particular for the preparation of dental restorations. 1. Pre-sintered blank for dental purposes based on lithium metasilicate glass ceramic , wherein the blank has a relative density of from 66 to 90% relative to the true density of the corresponding dense-sintered lithium disilicate glass ceramic.2. Pre-sintered blank according to claim 1 , which consists substantially of lithium disilicate glass ceramic.3. Pre-sintered blank according to claim 1 , wherein the glass ceramic includes lithium metasilicate as main crystal phase and contains more than 20 vol.-% lithium disilicate crystals.5. Pre-sintered blank according to claim 1 , which has at least two areas which differ by their coloration or translucence.6. Pre-sintered blank according to claim 1 , which has a holder for a processing device.7. Pre-sintered blank according to claim 1 , which has an interface in the form of a recess claim 1 , for connection to a dental implant.8. Pre-sintered blank according to claim 1 , which is obtainable by the process in which(a) lithium silicate glass in powder or granulate form is pressed to form a glass blank, (i) is at least 500° C., and', '(ii) lies in a range which extends over at least 30K, and in which the relative density varies by less than 2.5%., '(b) the glass blank is heat-treated in order to prepare a pre-sintered blank based on lithium metasilicate glass ceramic, wherein the temperature of the heat treatment'}9. Pre-sintered blank according to claim 1 , which has a relative density which results when(a) powder of a corresponding starting glass with an average particle size of <50 μm, relative to the number of particles, is uniaxially or isostatically pressed at a pressure of from 20 MPa to 200 MPa and (i) is at least 500° C., and', '(ii) lies in a range which extends over at least 30K and in which the relative density varies by less than 2.5%., '(b) the obtained ...

Controlling Of Sintering Kinetics Of Oxide Ceramics

The invention relates to multi-layer oxide ceramic bodies and in particular to presintered multi-layer oxide ceramic blanks and oxide ceramic green bodies suitable for dental applications. These bodies can be thermally densified by further sintering without distortion and are thus particularly suitable for the manufacture of dental restorations. The invention also relates to a process for the manufacture of such multi-layer oxide ceramic bodies as well as to a process for the manufacture of dental restorations using the multi-layer oxide ceramic bodies. 2. Blank according to which is suitable for the manufacture of a multi-unit dental restoration.3. Blank according to claim 1 , wherein the at least two different layers differ in terms of chemical composition.4. Blank according to claim 1 , wherein the oxide ceramic is based on zirconia.5. Blank according to claim 1 , wherein the coefficient of distortion is calculated on the basis of measurements of HVat measuring points which are distributed at a constant distance along a first line intercepting the different layers on an outer surface of the blank.6. Blank according to claim 35 , wherein the constant distance between the measuring points along the first and second lines is not more than 5 mm.8. Multi-layer oxide ceramic body for the manufacture of dental restorations comprising at least two different layers claim 35 , wherein a sintering behavior of the at least two different layers is aligned to allow the ceramic body to be sintered without distortion.9. Process for the manufacture of a multi-layer oxide ceramic body having at least two different layers which body can be sintered without distortion claim 35 , wherein the process comprises aligning a sintering behavior of the different layers.10. Process according to claim 9 , wherein the body is suitable for the manufacture of a multi-unit dental restoration.11. Process according to claim 9 , wherein the at least two different layers differ in terms of chemical ...

CeO2-STABILIZED ZrO2 CERAMICS FOR DENTAL APPLICATIONS

The present invention is directed to a porous pre-densified CeOstabilized ZrOceramic having a density of 50.0 to 95.0%, relative to the theoretical density of zirconia, and an open porosity of 5 to 50% as well as to a densified CeOstabilized ZrOceramic having a density of 97.0 to 100.0%, relative to the theoretical density of zirconia, and wherein the grains of the ceramic have an average grain size of 50 to 1000 nm, methods for the preparation of the pre-densified and densified ceramics and their use for the manufacture of dental restorations. 1. Porous CeO-stabilized ZrOceramic having a density of 50.0 to 95.0% , relative to the theoretical density of zirconia , and an open porosity of 5 to 50%.2. Porous ceramic according to having a density of 60.0 to 90.0%.3. Porous ceramic according to having an open porosity of 10 to 30%.4. Porous ceramic according to having a closed porosity of less than 5%.5. Porous ceramic according to claim 1 , wherein the pores of the ceramic have a mean pore diameter of 10 to 500 nm.6. Porous ceramic according to claim 1 , wherein the grains of the ceramic have an average grain size of 10 to 500 nm.7. Porous ceramic according to comprising tetragonal ZrOin an amount of 50 to 100 vol.-% claim 1 , based on the total volume of crystals of the ceramic.8. Method for preparing a porous CeO-stabilized ZrOceramic according to comprising{'sub': 2', '2, '(a) pre-densifying a CeO-containing ZrOstarting material to provide the porous ceramic.'}9. Method according to claim 8 , wherein pre-densifying in step (a) is performed by spark plasma sintering which includes heating the CeO-containing ZrOstarting material to a sintering temperature of about 950 to 1350° C. and/or heating the CeO-containing ZrOstarting material at a heating rate of 1 to 400° C./min.10. Method according to claim 1 , comprising(b) re-oxidizing the porous ceramic obtained in step (a).11. Densified CeO-stabilized ZrOceramic having a density of 97.0 to 100.0% claim 1 , relative to ...

LITHIUM DISILICATE-APATITE GLASS CERAMIC WITH TRANSITION METAL OXIDE

Lithium disilicate-apatite glass ceramics comprising transition metal oxide are described which are characterized by a high chemical stability, and the translucence of which can be adjusted as desired, and which can therefore be used in particular as restoration material in dentistry. 1. Lithium disilicate-apatite glass ceramic , which comprises lithium disilicate as main crystal phase and apatite as further crystal phase , and which comprises divalent oxide selected from the group of CaO , SrO and mixtures thereof and transition metal oxide selected from the group of oxides of transition metals with an atomic number from 39 to 79 and mixtures thereof , wherein the molar ratio of divalent oxide to transition metal oxide is in the range of from 1.0 to 20.0.2. Glass ceramic according to claim 1 , which comprises 52.0 to 75.0 wt.-% SiO.3. Glass ceramic according to claim 1 , which comprises 10.0 to 20.0 wt.-% LiO.4. Glass ceramic according to claim 1 , which comprises 4.0 to 8.0 wt.-% PO.5. Glass ceramic according to claim 1 , which comprises 2.0 to 9.0 wt.-% divalent oxide.6. Glass ceramic according to claim 1 , which comprises 2.5 to 8.5 wt.-% CaO.7. Glass ceramic according to claim 1 , which comprises 1.0 to 6.5 wt.-% SrO.8. Glass ceramic according to claim 1 , which comprises 0.1 to 1.5 wt.-% F.9. Glass ceramic according to claim 1 , which comprises 0 to 4.0 wt.-% AlO.10. Glass ceramic according to claim 1 , which comprises 0.5 to 8.5 wt.-% transition metal oxide.11. Glass ceramic according to claim 1 , in which the transition metal oxide is selected from the group of LaO claim 1 , YO claim 1 , ErO claim 1 , ZrO claim 1 , CeO claim 1 , TbO claim 1 , VO claim 1 , TaO claim 1 , NbOand mixtures thereof.12. Glass ceramic according to claim 1 , in which the transition metal oxide is present{'sub': 2', '3, 'according to the formula MeOin an amount of from 0 to 5.0 wt.-%.'}{'sub': '2', 'according to the formula MeOin an amount of from 0 to 6.5 wt.-%.'}{'sub': 4', '7, ' ...

Lithium Silicate- Low Quartz Glass Ceramic

Lithium silicate-low quartz glass ceramics are described which are characterized by a combination of very good mechanical and optical properties and can therefore be used in particular as restoration material in dentistry. 1. Lithium silicate-low quartz glass ceramic , which comprises lithium silicate as main crystal phase and low quartz as further crystal phase.2. Glass ceramic according to claim 1 , which comprises 59.0 to 79.0.3. Glass ceramic according to claim 1 , which comprises 8.0 to 15.0 wt.-% LiO.4. Glass ceramic according to claim 1 , which comprises 0 to 9.0 wt.-% PO.5. Glass ceramic according to claim 1 , which comprises 1.0 to 8.0 wt.-% oxide of monovalent elements MeO selected from the group of KO claim 1 , NaO claim 1 , RbO claim 1 , CsO and mixtures thereof.6. Glass ceramic according to claim 1 , which comprises 0 to 5.0 wt.-% KO.7. Glass ceramic according to claim 1 , which comprises 1.0 to 9.0 wt.-% oxide of divalent elements MeO selected from the group of CaO claim 1 , MgO claim 1 , SrO claim 1 , ZnO and mixtures thereof.8. Glass ceramic according to claim 1 , which comprises 1.0 to 6.0 wt.-% MgO.9. Glass ceramic according to claim 1 , which comprises 0 to 8.0 wt.-% oxide of trivalent elements MeOselected from the group of AlO claim 1 , BO claim 1 , YO claim 1 , LaO claim 1 , GaO claim 1 , InOand mixtures thereof.10. Glass ceramic according to claim 1 , which comprises 1.0 to 6.0 wt.-% AlO.11. Glass ceramic according to claim 1 , which comprises SiOand LiO in a molar ratio in the range of from 2.2 to 4.1.12. Glass ceramic according to claim 1 , which comprises lithium disilicate or lithium metasilicate as main crystal phase.13. Glass ceramic according to claim 1 , which has at least 20 wt.-% lithium disilicate crystals.14. Glass ceramic according to claim 1 , which has 0.2 to 28 wt.-% low quartz crystals.15. Starting glass claim 1 , which comprises the components of the glass ceramic according to .16. Starting glass according to claim 15 , which ...

LITHIUM DISILICATE APATITE GLASS-CERAMIC

Lithium disilicate apatite glass-ceramics are described which are characterized by a high chemical stability and can therefore be used in particular as restoration material in dentistry. 1. Lithium disilicate apatite glass-ceramic , which comprises lithium disilicate as main crystal phase and apatite as further crystal phase and which comprises 3.0 to 7.0 wt.-% KO.2. Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 60.0 to 74.0 wt.-% SiO.3. Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 10.0 to 20.0 wt.-% LiO.4. Lithium disilicate apatite glass-ceramic according to claim 1 , which contains 3.0 to 7.0 wt.-% PO.5. Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 0 to 5.0 wt.-% CaO and 0 to 4.0 wt.-% SrO claim 1 , wherein the combined amount of CaO and SrO is 1.5 to 5.5 wt.-%.6. Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 0.1 to 1.0 wt.-% F.7. Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 2.0 to 7.0 wt.-% oxide of trivalent elements and/or further oxide of tetravalent elements.8. Lithium disilicate apatite glass-ceramic according to claim 7 , wherein the oxide of trivalent elements is selected from the group of AlO claim 7 , YO claim 7 , LaOand mixtures thereof.9. Lithium disilicate apatite glass-ceramic according to claim 7 , wherein the further oxide of tetravalent elements is selected from the group of ZrO claim 7 , TiO claim 7 , GeOand mixtures thereof.11. Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises fluoroapatite as apatite.12. Lithium disilicate apatite glass ceramic which comprises lithium disilicate as main crystal phase and apatite as further crystal phase claim 1 , which comprises 3.0 to 7.0 wt.-% KO claim 1 , and which comprises more than 20 vol.-% lithium disilicate crystals.13. Starting glass claim 1 , which comprises the components of the glass-ceramic ...

Process For The Preparation Of Dental Restorations

The invention relates to a process for preparing dental restorations, wherein a lithium silicate glass ceramic or a lithium silicate glass is used which contains at least 8.5 wt.-% transition metal oxide selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides. 1. Process for the preparation of dental restorations , wherein a lithium silicate glass ceramic is shaped to the dental restoration by(i) pressing or(ii) machining,wherein the glass ceramic and the glass comprises at least 8.5 wt.-% transition metal oxide selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides, and further comprises more than 5 vol.-% of lithium metasilicate crystals and/or more than 5 vol.-% of lithium disilicate crystals, relative to the total glass ceramic.2. Process according to claim 1 , wherein the dental restorations are selected from inlays claim 1 , onlays claim 1 , crowns claim 1 , veneers claim 1 , facets and abutments.3. Process according to claim 1 , wherein the pressing is conducted at a temperature of 700 to 1200° C.4. Process according to claim 1 , wherein the pressing is conducted at a pressure of 2 to 10 bar.5. Process according to claim 1 , wherein the machining is effected in a CAD/CAM process.6. Process according to claim 1 , wherein the glass ceramic comprises more than 10 vol.-% of lithium metasilicate crystals and/or more than 10 vol.-% of lithium disilicate crystals claim 1 , relative to the total glass ceramic.7. Process according to claim 1 , wherein the glass ceramic comprises more than 15 vol.-% of lithium metasilicate crystals and/or more than 15 vol.-% of lithium disilicate crystals claim 1 , relative to the total glass ceramic.8. Process according to claim 1 , wherein the glass ceramic comprises at least 8.5 wt.-% transition metal oxide selected from the group consisting of ...

BLANK FOR DENTAL PURPOSES

Blanks for dental purposes are described which have at least two layers, bonded to one another, of lithium silicate glasses and glass ceramics, wherein the layers differ in colour and the layers are monolithic. 1. Blank for dental purposes which has at least 2 layers , bonded to one another , oflithium silicate glass,lithium silicate glass with nuclei orlithium metasilicate glass ceramic,wherein the layers differ in colour and the layers are monolithic.2. Blank according to which has layers of lithium silicate glass with nuclei or layers of lithium metasilicate glass ceramic.3. Blank according to claim 1 , in which the lithium metasilicate glass ceramic comprises lithium metasilicate as main crystal phase and comprises more than 5 vol. % lithium metasilicate crystals.4. Blank for dental purposes which has at least 2 layers claim 1 , bonded to one another claim 1 , oflithium disilicate glass ceramic,wherein the layers differ in colour and the layers are monolithic.5. Blank according to claim 4 , in which the lithium disilicate glass ceramic comprises lithium disilicate as main crystal phase and comprises more than 30 vol.-% lithium disilicate crystals.8. Blank according to claim 1 , which has a holding means for a processing device claim 1 , wherein the holding means consists of metal or plastic.9. Process for producing the blank with layers of lithium silicate glass claim 1 , lithium silicate glass with nuclei or lithium metasilicate glass ceramic according to claim 1 , in which(i) monolithic layers of lithium silicate glass, lithium silicate glass with nuclei or lithium metasilicate glass ceramic are arranged on top of one another and(ii) the layers are bonded to one another.10. Process according to claim 9 , in which layers of lithium silicate glass or lithium silicate glass with nuclei are converted to layers of lithium silicate glass with nuclei or lithium metasilicate glass ceramic and are converted by at least one heat treatment.11. Process according to claim ...

LITHIUM SILICATE GLASS CERAMICS AND LITHIUM SILICATE GLASS CONTAINING CESIUM OXIDE

The invention relates to the use of lithium silicate glass ceramics and glasses with caesium oxide content, which are suitable in particular for veneering oxide ceramic restorations and metal restorations. 3. Process according to claim 1 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise up to 70.0 wt.-% SiO.4. Process according to claim 1 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 5.0 to 10.0 wt.-%.5. Process according to claim 1 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 2.0 to 6.0 wt.-% AlO.6. Process according to claim 1 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 4.0 wt.-% NaO and/or KO.7. Process according to claim 1 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 2.5 wt.-% RbO.8. Process according to claim 1 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 3.8 wt.-%.9. Process according to claim 1 , in which a lithium silicate glass ceramic is used which comprises lithium metasilicate as main crystal phase and has a bending strength in the range of about 180 to 300 MPa and/or a fracture toughness claim 1 , measured as Kvalue claim 1 , of at least about 2.0 MPa·m.10. Process according to claim 1 , in which a lithium silicate glass ceramic is used which comprises lithium disilicate as main crystal phase and has a bending strength in the range of about 400 to 700 MPa and/or a fracture toughness claim 1 , measured as Kvalue claim 1 , of at least about 2.0 MPa·m.11. Process according to claim 1 , in which a lithium silicate glass ceramic is used which comprises at least one caesium aluminosilicate crystal phase claim 1 , wherein the caesium aluminosilicate has the formula CsAlSiO claim 1 , wherein x is 0.70 to 0.90.12. Process according to claim 1 , in which a lithium silicate glass ceramic is used which ...

Ceramic tooth replacement and method for the production thereof

The invention relates to a tooth replacement, particularly a composite crown or composite bridge, comprising two independent components, i.e. an inner frame structure (1) and an outer facing cover (3), which are joined together by means of a connector material (2). Also disclosed is a method for producing said tooth replacement.

Sinterable lithium disilicate glass-ceramics

Polymerizable composite material and its use

Polymerisierbares Kompositmaterial, dadurch gekennzeichnet, daß es (a) mindestens ein polymerisierbares Monomer und (b) mindestens ein transparentes Glas mit hoher Calcium- und Fluorionenabgabe aufweist, welches die folgenden Komponenten enthält: Komponente Gew.-% SiO 2 24,0 bis 56,0 CaO 26,0 bis 57,0 F 4,0 bis 14,0 Al 2 O 3 0 bis 5,0 und mindestens eine der Komponenten Na 2 O 1,0 bis 9,0 B 2 O 3 1,0 bis 14,0 Polymerizable composite material, characterized in that it (a) at least one polymerizable monomer and (b) has at least one transparent glass with high calcium and fluorine ion release, which contains the following components: component Wt .-% SiO 2 24.0 to 56.0 CaO 26.0 to 57.0 F 4.0 to 14.0 Al 2 O 3 0 to 5.0 and at least one of the components Na 2 O 1.0 to 9.0 B 2 O 3 1.0 to 14.0

Lithium silicate glass ceramic

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Lithium silicate glass ceramic and glass with rubidium oxide content

The invention relates to the use of lithium silicate glass ceramics and glasses with rubidium oxide content for coating an oxide ceramic, a metal or an alloy.

Polymerizable composite material

(57)【要約】 【課題】 カルシウムイオンの高い放出に加えて、水と の接触に際して高いフッ素イオンの放出を示し、深い層 においてでさえ光により完全に硬化し、そして美的を要 求する歯科修復のための材料としてのそれらの使用を可 能にする高い半透明性を示す重合可能な複合材料を提供 すること。 【解決手段】 重合可能な複合材料であって、（ａ）少 なくとも１つの重合可能なモノマー、および（ｂ）カル シウムイオンおよびフッ素イオンの高度の放出を有する 少なくとも１つの透明ガラスであって、以下の成分： 成分 重量％ ＳｉＯ 2 ２４．０から５６．０ ＣａＯ ２６．０から５７．０ Ｆ ４．０から１４．０ を含む透明ガラス、を含む、重合可能な複合材料。

Lithium silicate diopside glass ceramic

Es werden Lithiumsilikat-Diopsid-Glaskeramiken beschrieben, die sich durch eine steuerbare Transluzenz auszeichnen und gut maschinell verarbeitet werden können und daher insbesondere als Restaurationsmaterial in der Zahnheilkunde eingesetzt werden können. It describes lithium silicate-diopside glass-ceramics, which are characterized by a controllable translucency and can be easily processed by machine and therefore can be used in particular as a restorative material in dentistry.

Lithium disilicate-apatite glass ceramic with transition metal oxide

The invention relates to lithium disilicate-apatite glass-ceramics containing a transition metal oxide. Said glass-ceramics are characterised by high chemical resistance and their translucency can be adjusted as required. Therefore, they can be used, in particular, as restoration materials in dentistry.

Leucite-Containing Phosphosilicate Glass-Ceramic

A leucite-containing phosphosilicate glass-ceramic is described which, in addition to a leucite crystalline phase and at leat one further crystalline phase, also contains one or more glass phases. The glass-ceramic comprises the following components: SiO2 49.0 -57.5 % by wt. Al2O3 11.4 -21.0 % by wt. P2O5 0.5 -5.5 % by wt. CaO 2.5 -11.5 % by wt. K2O 9.0 -22.5 % by wt. Na2O 1.0 -9.5 % by wt. Li2O 0 -2.5 % by wt. B2O3 0 -2.0 % by wt. TiO2 0 -3.0 % by wt. ZrO2 0.8 -8.5 % by wt. CeO2 0 -3.0 % by wt. F 0.25 -2.5 % by wt. La2O3 0 -3.0 % by wt. ZnO 0 -3.0 % by wt. BaO 0 -3.0 % by wt. MgO 0 -3.0 % by wt. SrO 0 -3.0 % by wt. Such glass-ceramics are suitable for use in dentistry, for example, to make crowns, bridges and inlays.

Lithium silicate glass ceramic and glass with ZrO2 content

Lithium silicate glass ceramic

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Pre-sintered blank for dental purposes.

Se describen blancos pre-sinterizados con base en vidrio cerámico de metasilicato de litio los cuales son adecuados en particular para la preparación de restauraciones dentales.

Use of glass-ceramic with alpha quartz as the main crystalline phase of a dental material

La invención se refiere a vitrocerámicas con SiO2 como fase cristalina principal y sus precursores, caracterizadas por tener muy buenas propiedades mecánicas y ópticas, y ser utilizables, en particular, como materiales de restauración en odontología. (Traducción automática con Google Translate, sin valor legal) The invention relates to glass-ceramics with SiO2 as the main crystalline phase and its precursors, characterized by having very good mechanical and optical properties, and being usable, in particular, as restorative materials in dentistry. (Automatic translation with Google Translate, without legal value)

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Method for producing dental restorations

Lithium silicate glass ceramic

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Use of a lithium silicate blank for fabrication of a dental restoration and procedure for preparing a dental restoration

Utilización de una pieza en bruto de silicato de litio con metasilicato de litio como fase cristalina principal para la fabricación de una restauración dental. Use of a lithium silicate blank with lithium metasilicate as the main crystalline phase for the fabrication of a dental restoration.

Method for producing lithium silicate glasses and lithium silicate glass ceramics

The invention relates to a method for producing a lithium silicate glass or a lithium silicate glass ceramic containing cerium ions and which is particularly suitable for the production of dental restorations having fluorescence properties largely corresponding to those of natural teeth. The invention further relates to a lithium silicate glass and a lithium silicate glass ceramic obtainable according to the invention which are suitable for use as dental material and particularly for the production of dental restorations, and a glass-forming composition which is suitable for use in the method according to the invention.

Lithium silicate glass ceramic and glass with ZrO2 content

Use of a lithium silicate material

Verwendung eines Lithiumsilicatmaterials in Form eines Lithiumsilicatrohlings, der Lithiummetasilicat als Hauptkristallphase enthält zur Herstellung einer dentalen Restauration, wobei der Lithiumsilicatrohling mit Lithiummetasilicat als Hauptkristallphase durch maschinelle Verarbeitung oder durch Heißpressen zu einer gewünschten Geometrie geformt wird, um eine dentale Restauration zu bilden, und wobei der Lithiumsilicatrohling nach einem Verfahren herstellbar ist, bei dem:(a) eine Schmelze eines Ausgangsglases gebildet wird, die die Anfangskomponenten SiO, LiO, KO, AlOund POals Hauptkomponenten, aber kein LaOenthält,(b) die Schmelze des Ausgangsglases in eine Form gegossen wird, um einen Ausgangsglasrohling zu bilden, und der Glasrohling auf Raumtemperatur abgekühlt wird,(c) der Ausgangsglasrohling einer ersten Wärmebehandlung bei einer ersten Temperatur unterworfen wird, um ein Glasprodukt zu ergeben, welches Keime enthält, die für die Bildung von Lithiummetasilicatkristallen geeignet sind, und(d) das Glasprodukt aus Stufe (c) einer zweiten Wärmebehandlung bei einer zweiten Temperatur unterworfen wird, die höher als die erste Temperatur ist, um den Lithiumsilicatrohling mit Lithiummetasilicatkristallen als Hauptkristallphase zu erhalten. Use of a lithium silicate material in the form of a lithium silicate blank containing lithium metasilicate as the main crystal phase for preparing a dental restoration, wherein the lithium silicate blank having lithium metasilicate as the main crystal phase is formed into a desired geometry by machining or hot pressing to form a dental restoration, and wherein the lithium silicate blank can be prepared by a process comprising: (a) forming a melt of a starting glass containing the initial components SiO, LiO, KO, AlO and PO as main components but no LaO; (b) casting the melt of the starting glass into a mold (c) the starting glass blank is subjected to a first heat treatment at a first temperature to yield a glass product containing ...

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Lithium silicate low quartz glass ceramics

The invention relates to lithium silicate low quartz glass-ceramics which are characterised by a combination of very good mechanical and optical properties and therefore, in particular, can be used as restoration material in dentistry.

Sinterable lithium disilicate glass ceramic

Leucite-containing phosphosilicate glass-ceramic

A leucite-containing phosphosilicate glass-ceramic is described which, in addition to a leucite crystalline phase and at least one further crystalline phase, also contains one or more glass phases.

Process for the manufacture of a multi-layer oxide ceramic body which can be sintered without distortion

The invention relates to multi-layer oxide ceramic bodies and in particular to presintered multi-layer oxide ceramic blanks and oxide ceramic green bodies suitable for dental applications. These bodies can be thermally densified by further sintering without distortion and are thus particularly suitable for the manufacture of dental restorations. The invention also relates to a process for the manufacture of such multi-layer oxide ceramic bodies as well as to a process for the manufacture of dental restorations using the multi-layer oxide ceramic bodies.

Pre-sintered blank for dental purposes

Disclosed are pre-sintered blanks on the basis of a lithium disilicate glass-ceramic which are particularly suitable for the production of dental restorations.

Lithium disilicate apatite glass-ceramic

Lithium disilicate apatite glass-ceramics are described which are characterized by a high chemical stability and can therefore be used in particular as restoration material in dentistry.

Lithium silicate glass ceramic and glass with transition metal oxide

Lithium silicate-glass ceramic (I) comprises at least 8.5 wt.% of transition metal oxide comprising oxides of yttrium and/or oxides of transition metals having an atomic number of 41-79. Independent claims are included for: (1) a lithium silicate-glass comprising components of (I); and (2) producing (I), comprising subjecting a base glass with components of (I) or the glass to at least a heat treatment of 450-950[deg] C.

Lithium silicate glass ceramic with alpha quartz

Es werden Lithiumsilikat-Tiefquarz-Glaskeramiken beschrieben, die sich durch eine Kombination von sehr guten mechanischen und optischen Eigenschaften auszeichnen und daher insbesondere als Restaurationsmaterial in der Zahnheilkunde eingesetzt werden können. It describes lithium silicate deep quartz glass ceramics, which are characterized by a combination of very good mechanical and optical properties and therefore can be used in particular as a restorative material in dentistry.

LITHIUM SILICATE GLASS CERAMIC AND GLASS WITH ZrO2 CONTENT

【課題】粘性状態でプレスすることによって、プロセスが実質的に亀裂も傷も含まないコーティングを形成するプロセスで、酸化ジルコニウムセラミックにコーティングされ得るガラスセラミックを提供すること。 【解決手段】特に粘性状態でプレスすることによって、酸化ジルコニウムセラミックに有利に塗布され得、そしてこの酸化ジルコニウムセラミックとしっかりした結合を形成し得る、ケイ酸リチウムガラスセラミックおよびガラスが提供される。 【選択図】なし

Procedure for manufacturing dental restorations

Procedimiento para la fabricación de restauraciones dentales a base de una cerámica de vidrio de disilicato de litio, en el que una cerámica de vidrio de silicato de litio o un vidrio de silicato de litio está conformada por (i) prensado o (ii) mecanizado para formar una restauración dental y en el que la cerámica de vidrio y el vidrio contienen entre un 54,0 y un 80,0% en peso de SiO2 y por lo menos un 8,5% en peso de un óxido de un metal de transición seleccionado de entre el grupo constituido por óxidos de ytrio, óxidos de metales de transición con un número atómico comprendido entre 41 y 79 y mezclas de dichos óxidos.

Procedure for manufacturing glasses and glass-ceramics with SiO2 as the main crystalline phase

Procedimiento de fabricación de una vitrocerámica con SiO2 como fase cristalina principal o de un vidrio que contiene núcleos para la cristalización de SiO2, que comprende una etapa en la que una masa fundida de un vidrio de partida que comprende iones cerio se somete a condiciones reductoras. Process for manufacturing a glass-ceramic with SiO2 as the main crystalline phase or a glass containing nuclei for the crystallization of SiO2, comprising a stage in which a melt of a starting glass comprising cerium ions is subjected to reducing conditions.

Low sintering apatite glass ceramics

Lithium silicate materials

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength. <IMAGE>

Method for the preparation of lithium silicate glasses and lithium silicate glass ceramics

The invention relates to a method for producing a lithium silicate glass or a lithium silicate glass ceramic containing cerium ions and which is particularly suitable for the production of dental restorations having fluorescence properties largely corresponding to those of natural teeth. The invention further relates to a lithium silicate glass and a lithium silicate glass ceramic obtainable according to the invention which are suitable for use as dental material and particularly for the production of dental restorations, and a glass-forming composition which is suitable for use in the method according to the invention.

Phosphosilicate glass ceramics containing leucite

A phosphosilicate glass-ceramic has a leucite crystal phase, at least one other crystal phase, and one or more glass phases, and contains 49.0-57.5 wt.% SiO2, 11.4-21.0% Al2O3, 0.5-5.5% P2O5, 2.5-11.5% CaO, 9.0-22.5% K2O, 1.0-9.5% Na2O, 0-2.5% Li2O, 0-2.0% B2O3, 0-3.0% TiO2, 0.8-8.5% ZrO2, 0-3.0% CeO2, 0.25-2.5% F, 0-3.0% La2O3, 0-3.0% ZnO, 0-3.0% BaO, 0-3.0% MgO and 0-3.0% SrO.

Glass ceramic having a quartz solid solution phase

The invention relates to quartz-mix crystal glass ceramics and to precursors thereof which are characterised by excellent mechanical and optical characteristics and which can be used, in particular, as restoration material in dentistry.

Lithium silicate glass ceramic and glass with transition metal oxide

Lithium silicate glass ceramic

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Lithium silicate diopside glass ceramics

Es werden Lithiumsilikat-Diopsid-Glaskeramiken beschrieben, die sich durch eine steuerbare Transluzenz auszeichnen und gut maschinell verarbeitet werden können und daher insbesondere als Restaurationsmaterial in der Zahnheilkunde eingesetzt werden können.

Lithium silicate glass ceramic and glass with ZrO2 content

Es werden Lithiumsilikat-Glaskeramiken und -Gläser beschrieben, die sich in vorteilhafter Weise auf Zirkonoxidkeramiken insbesondere durch Aufpressen im viskosen Zustand aufbringen lassen und mit diesen einen festen Verbund bilden.

Potassium-zinc-silicate glass sintering at low temperature

Potassium-zinc silicate glass contains (in wt.%): 60.0-72.0 silica, 1.0-5.0 lithium oxide, 10.0-23.0 potassium oxide and 8.5-20.0 zinc oxide. Preferred Features: The glass additionally contains (in wt.%): 0-4.0 sodium oxide (Na2O), 0-4.0 magnesium oxide (MgO), 0-3.6 calcium oxide (CaO), 0-3.0 strontium oxide (SrO), 0-8.0 aluminum oxide (Al2O3), 0-3.3 boron oxide (B2O), 0-3.0 lanthanum oxide (La2O3), 0-6.0 zirconia (ZrO2), 0-2.5 titania (TiO2), 0-2.0 cerium oxide (CeO2), 0-5.0 tin oxide (SnO2), 0-1.0 phosphorus oxide (P2O5), 0-1.8 terbium oxide (Tb4O7), and 0-1.1 fluorine (F). The glass does not crystallize during thermal treatment in the region of 600-800 degrees C for 1 minute to 1 hour. The glass has a sintering temperature of less than 800, especially 760 degrees C or less, and has a linear thermal expansion coefficient of less than 12.3 x 10<-6> K<-1> measured in the region of 100-400 degrees C. The glass additionally contains an apatite glass ceramic containing (in wt.%): 56.0-65.0 silica (SiO2), 1.8-5.3 lithium oxide (Li2O), 9.0-16.0 zinc oxide (ZnO), 3.5-10.5 calcium oxide (CaO), 2.0-6.0 P2O5 and 0.5-1.0 F.

Lithium silicate glass ceramic material

Procedimiento para preparar una restauración dental, en el que se utiliza un material vitrocerámico de silicato de litio que comprende los siguientes componentes: Componente % en peso SiO2 64,0 - 75,0, preferentemente 64,0 - 73,0 Li2O 13,0 - 17,0 K2O 2,0 - 5,0 Al2O3 0,5 - 5,0 Agente de nucleación 2,0 - 5,0 Me(II)O 0 - 3,0 y que comprende menos del 0,1% en peso de ZnO, siendo el Me(II)O seleccionado de entre al menos uno de entre CaO, BaO, MgO y SrO, y que comprende metasilicato de litio como fase cristalina principal. Procedure for preparing a dental restoration, in which a lithium silicate glass ceramic material is used comprising the following components: Component% by weight SiO2 64.0-75.0, preferably 64.0-73.0 Li2O 13.0 - 17.0 K2O 2.0 - 5.0 Al2O3 0.5 - 5.0 Nucleating agent 2.0 - 5.0 Me (II) O 0 - 3.0 and comprising less than 0.1% in ZnO weight, the Me (II) O being selected from at least one of CaO, BaO, MgO and SrO, and comprising lithium metasilicate as the main crystalline phase.