Gerät zur farbbestimmung von zähnen

The invention concerns e£n down to the Farbbest “mmung a tenth in the oral cavity gine$ Pat£enTe m4t n source of text with a defined spectrum at visible light, a first light conductor for leading ües light of the source of light on the tooth which can be examined, a second light conductor, to whose end with the end d=s first Lichtlei%er= swore, for the admission of light reflected by the tooth surface, common flexible t%mhüllung both Lich%leiter and evaluation means for the analysis of the spectrum of the reflected light. During the production of artificial dentures, as for instance bridges, crowns etc., it is desirable for aesthetic reasons that the artificial tooth as naturally as possible works. To it belongs above all that the k LV llche tooth di l Auh F b h t wi di ùnch of existing own teeth of the patient, so that the artificial tooth is to be recognized for example with the smile of the prosthesis carrier not immediately as artificial. zahnersatzstficke are gcfcrtigt fiblicherweise by tooth technicians in unabhangigen laboratories, i.e. spatially practice of the treating dentist gotronnt from mV. For example if a dentist wants one by accident damaged Schneidezahn over crowns, then it is most desirable that as accurate a Inform as possible tionen “over the tooth color of the bcnachbarten Schneidezähne the outer practice of the treating dentist to the laboratory of the tooth technician is conveyed, who manufactures the crown for example from a suitable Keramikmatsrial. So far Zahnarzt1 lp tooth technician was dependent to determine the tooth colors of patients by means of a subjective method. This consisted essentially of it, differently dyed WerKstofzplattchen as urine samples in mouth-hollow e6 PatiQnton too haßtan and the Wnvhpvnhm with dAn natural tooth colors is enough to compare, to the examiners one for the natural tooth color in such a way if possible approximating Farbprobe found haS. It lies in the nature of the thing that the Ergebnlsse of such is zu£riodonstellend subjektivcn Prüfmcthode not always. The inadequacy of the human eye, disturbing Tagesoder art light, color reflections by the direct environment of the tooth as well as the psychological and physical constitution of the examiner affect the selective procedure negatively. Since a typical material pallet at ceramic(s) materials of different colouring covers for example 120 different artificial tooth far that, the subgektlve selective procedure is comparatively time-consuming over it hJnR s. Devices of the initially mentioned kind for the objective measurement of the Zanntarbe slnd by the UZ 195 34 517 AI, DE 90 12 977 U1 and WHERE 87/0347D admits. Despite the relatively large development of the evaluation procedures of the well-known devices this still substantial Hanahabungsnachteile and falsifying foreign light influences exhibit. The invention is the basis from there the task, equipment for the color regulation of a Sahnes in the Wundhöhle iù patient of the initially mentioned kind 2u erstm11Rn, carrion simply manageably is made possible and an error free measurement. For the solution of this task e£n equipment of the initially erwahnten kind is gokennzeßchnet erfindungugcmäß thereby that mm hnnahen end of the light conductors and the flexible casing a flexible seal (rubber seal], suitable for the Abschir ung the tooth of foreign light, are arranged. R i the equipment according to invention preferably consist the light conductors of optical waveguide cables, which are flexibly manageable with the common flexible casing and as flexible thin hose in O£e Mundh hle D P left ILL LL elùgeführt to become common to be able. Glasf Av abA] for the line of small achievements can exhibit a very small Quer$chnitt, so that a simple and device which can be handled precisely is made possible. The screen against foreign light effected via ale Gummimanschett their diameter preferredworth arranged at the dlsualen Znd dor casing smaller is than the width of the average human tooth. The rubber seal causes the screen the reflecting light of taking up light conductor against foreign light. On this Wciuu it becomes sichorgestellü that only light of details admitted of composition on the tooth which can be examined falls and so from the reflected laughs accurate conclusions on the objective color of the tooth which can be determined is pulled küxmun. The light, which enters by the front side 0ffnung of the second light conductor, reflected by the tooth, will by this gelei e and can beLm withdrawal outer D m Zw iLe, L left hLl iLe one wave nlÆno LV IRktivAn R1ement to be supplied, which can be a lattice or also a prism. Thereby a spectrographic analysis of the reflected light is made possible. From the spectrographic analysis the standard color proportional values leave themselves and/or. Standard valences determine. However that in AD angigkeit of the Spck%ralanalyee from a abgospoicher%en Tahe]] e the next coming color is preferential is selected. An alphanumeric characteristic value is assigned to all colors, which stands again for the color a certain of a material. The dentist or its aid can thus within seconds determine an objective value, which can be conveyed as alphanumeric code into the Dental laboratory, the appropriate Zahnprouhese h “rutullL. D L the order implementing tooth technicians w i due to the indicated code exactly, which color that must exhibit ceramic which can be used or other Werksto£f. Further preferential execution forms of the invention ind in the Unteransprüchen described. The invention is more near described in the following on the basis several in the Zezchnung of represented Auuführungsbeißpiele. In the designation show: Figure i - a schematic representation of the substantial construction units erfindungsgemMBem C-erät@ figure 2 - a descriptive representation of a flexible light conductor in accordance with a preferential execution form of the invention, figure 3 - an increased detail representation in accordance with figure 2, figure 4 - a schematic representation of the Anfh in principle LV Rinns 8rf ndungsgmmäßon C guesses/advises to be used s using a source of light with a defined spectrum at defined light, figure erfindungsgemaßea equipment in accordance with figure 4, whereby one farbemp£in Œ lichen CCD Aufx employs, =) m “three monochromatic phntndntAktoren, and figure 6 - an alternative Ausführungstorm, with which in place of a source of light with oinQm defined spectrum at visible light three monochromatic sources of light are used. Figure i z i L D n mch maulm=h n structure D r most important Bautcilo of equipment according to invention. A source of light i0 threw light on a tooth 12, whose tooth (arhe to determine is. From the tooth reflected light is transmitted one-wavelengthselective LiChtde ekEcr to 14 and D u1 a outer one worth means industrial union. Nswn] 16 indicates as a function of the distribution of the three basic colours red, green and blue and/or the determined standard valences, an alphanumeric value, the one of for example 12U Werkstot/arDen vtmmitte assigned fsr. Figure 2 shows a structure in accordance with figure 1 in a made concrete execution form. Figure 3 shows a Detaildazstellung. A flexible casing 18 is so flexible and exhibits a so thin Durchmcuucr that its end of 19 in D r oral cavity of the patient problem-free on talk arbitrary Zann 12 which can be examined be touched down can. As figure 3 shows, the flexible casing 18 contains a first light conductor 20, by which the Li=h D r source of light 10 is led and the Sahn 12 which can be examined hits. It prevents a rubber seal 22 arranged at the distal end of 19 of the flexible casing 18 that foreign light, for example of the high performance dentist's lamp of the Zahnarzues, on which too untgrsu=h itd n ten 12 falls and which result of measurement falsifies. The light reflected by the tooth 12 is returned by e n second G1asfaserkabel 24 and supplied to a wavelengthselective element. This can be a lattice or a prism. uie e after wavelength differently diverted light radiation are assigned to a Ancrdnung 28 RKs 002,459 UI by photosensitive diodes. The intensity of the individual wavelength portions can be bestemmt in such a way. £n Ausw Lemittel of 30, beispiel=wci C in FoEm oinoß laptop computers generates an alphanumeric characteristic value, which is assigned for example to a Werkstoffarben different of 120. A Normprub 32 can be used for calibrating the Gerätc= figure 4 shows the schematic structure of a device in accordance with a further AusfUhrungsbelspiel. There vun de Lichtquelle on the light thrown to examiners A ½ n 12 is reflected and arrived at an photo-sensitive CCD chip 33. Lenses 34 can be intended, around laugh of the source of light i0 on the tooth which can be examined 12 to lead Dzw. the reflected Lich on dia. CCD unit 33 to o n r n. The values - for example tensions -, generated by the CCD unit 33, can be evaluated and be =bgelegt in a buffer J6. The buffer 36 can be connected then with an evaluation means 38, which hears the building regulation to one of 120 Farbwerten. Figure 5 shows mine alLeL'iLaLiv execution form with the three photodetectors 38 monochromatic in place of the CCD chip 33 to be used. Figure 6 shows a conceivable further alternative outer one guidance fuL, ù, with which in place of a T.ichtqù R m t a defined spectrum at visible light three monochromatic sources of light 42 are used. These radiate for example with defined wellenl ngen in red, green u blue. The intensity of the reflected portions mittel8 of a PhotodetQktors 44 can be armittQlt, whereby again in an indicator means 38 an alphanumeric announcement can be produced.