26-07-2018 дата публикации
Номер: US20180206953A1
Dental restorations are created by preparing a hydrocolloid mold for such dental appliances as crowns and bridges. A slurry of zirconia powder and 3-O-acryloyl-D-glucose is prepared. The slurry is gelcast in the hydrocolloid mold with polymerization of the 3-O-acryloyl-D-glucose to a green body. The green body is dried and machined to the form of the dental restoration. The polymerized 3-O-acryloyl-D-glucose is then burned from the machined green body. The remaining zirconia body in the form of the dental restoration is then sintered to form the finished device. 1. A process for creating dental restorations , comprisingcreating a mold for the restoration;preparing a slurry of zirconia powder and a monosaccharide based monomer;gelcasting the slurry with polymerization of the monosaccharide based monomer to a green body in the mold of the dental restoration;sintering the green body to form the dental restoration.2. The process of claim 1 , the monosaccharide based monomer being 3-O-acryloyl-D-glucose.3. The process of claim 2 , preparing the slurry further including water claim 2 , a dispersant claim 2 , a polymerization activator and a polymerization initiator.4. The process of further comprisingspraying the mold with the initiator before gelcasting the slurry.5. The process of further comprisingproviding a barrier to oxygen on the slurry in the mold.6. The process of further comprisingdrying the green body before sintering in a climate chamber including presenting the green body to a humidity of 85% in the climate chamber and reducing the humidity in the climate chamber by 1.5% per hour to a humidity in the climate chamber of 60%.7. The process of claim 6 , drying the green body further including bringing the temperature by incremental amounts to 50° C. continuously during reduction of the humidity in the climate chamber.8. The process of claim 7 , drying the green body further including retaining the humidity in the climate chamber at 60% and the temperature at 50° ...
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