# US 12,109,083 B2 · Method for manufacturing a glazed dental prosthesis > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,109,083 B2 - Document ID: US12109083B2 - Status: Granted - Kind: B2 - Application number: 17/914,859 - Filed: 2021-03-29 - Published: 2023-03-02 - Granted: 2024-10-08 - Earliest claimed: 2020-03-30 - Assignees: Institut Straumann AG - Applicants: Institut Straumann AG - Inventors: Andreas Van Ophuysen; Michael Graf - Web page: https://patentgrep.com/patent/US12109083B2 ## CPC - A61C 13/09: {Composite teeth, e.g. front and back section (A61C13/0835, A61C13/1023 take precedence)}; Multilayer teeth - A61C 13/0003: {Making bridge-work, inlays, implants or the like} - A61C 13/0006: {Production methods} - A61C 13/082: {Cosmetic aspects, e.g. inlays; Determination of the colour (A61C19/10 takes precedence)} - A61C 13/083: Porcelain or ceramic teeth {(A61C13/081 takes precedence; preparations A61K6/80)} - A61K 6/20: Protective coatings for natural or artificial teeth, e.g. sealings, dye coatings or varnish - A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00) - A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D) ## Abstract In one aspect, a method for manufacturing a glazed dental prosthesis includes at least the steps of: a) providing a dental prosthesis body; b) position sensitive application of a predetermined amount of a glaze composition to at least a part of the dental prosthesis body surface, wherein the glaze comprises a heat sensitive coloring indicator and wherein this step is performed one or more times; c) controlling the applied glaze amount at least at one position of the glazed dental prosthesis body surface by assessing the color intensity at that position; and d) subjecting the coated dental body to a heat treatment to form the glazed dental prosthesis, wherein the temperature in the heat treatment is larger or equal to the de-composition temperature of the heat sensitive color indicator, wherein at least 90 mol-% of the coloring indicator are transformed into the colorless leuko-form. ## Claims ### Claim 1 A method for manufacturing a glazed dental prosthesis, the method comprising at least the steps of: a) providing a dental prosthesis body; b) position sensitive application of a predetermined amount of a glaze composition to at least a part of the dental prosthesis body surface, wherein the glaze composition comprises a heat sensitive coloring indicator and wherein this step is performed one or more times; c) controlling the applied glaze composition amount at least at one position of the glazed dental prosthesis body surface by assessing the color intensity at that position; and d) subjecting the coated dental prothesis body to a heat treatment to form the glazed dental prosthesis, wherein the temperature in the heat treatment is larger or equal to the de-composition temperature of the heat sensitive coloring indicator, wherein at least 90 mol-% of the heat sensitive coloring indicator are transformed into a colorless form. ### Claim 2 (depends on 1) The method according to claim 1, wherein the heat sensitive coloring indicator is a dye. ### Claim 3 (depends on 1) The method according to claim 1, wherein the heat sensitive coloring indicator is an alizarin derivative. ### Claim 4 (depends on 1) The method according to claim 1, wherein the heat sensitive coloring indicator is a diketopyrrolopyrrole-derivative. ### Claim 5 (depends on 1) The method according to claim 1, wherein the dental prosthesis body surface is a sintered ceramic. ### Claim 6 (depends on 1) The method according to claim 1, wherein the glaze composition applied in step b) comprises a mixture of inorganic particles comprising a SiO2 and B2O3 content of larger or equal to 50 weight-% and smaller or equal to 90 weight-%. ### Claim 7 (depends on 1) The method according to claim 1, wherein the glaze composition applied in step b) comprises a mixture of inorganic particles at least comprising SiO2, B2O3, Al2O3, Na2O particles. ### Claim 8 (depends on 1) The method according to claim 1, wherein the glaze composition applied in step b) comprises a mixture of inorganic particles at least comprising SiO2, B2O3, Al2O3, Na2O, CaO, K2O, SnO2, BaO, MgO, ZnO, ZrO2 and P2O5 particles. ### Claim 9 (depends on 1) The method according to claim 1, wherein the glaze composition applied in step b) comprises a solvent selected from the group consisting of glycol ethers or mixtures thereof. ### Claim 10 (depends on 9) The method according to claim 9, wherein the solvent is selected from the group consisting of di(propylene glycol) methyl ether, 1-methoxy-2-propanol or mixtures thereof. ### Claim 11 (depends on 1) The method according to claim 1, wherein the concentration of the heat sensitive coloring indicator in the glaze composition is larger or equal to 0.01 weight-% and smaller or equal to 1.5 weight-%. ### Claim 12 (depends on 1) The method according to claim 1, wherein color assessment in step c) is performed by a camera. ### Claim 13 (depends on 6) The method according to claim 6, wherein the weight ratio of the inorganic particles and the solvent in the glaze composition applied in step b) is larger or equal to 0.5 and smaller or equal to 4. ### Claim 14 (depends on 1) The method according to claim 1, wherein the heat treatment in step d) is at least partially performed at a temperature of above or equal to 500° C. and below or equal to 1000° C. ### Claim 15 (depends on 1) The method according to claim 1, wherein method step b) is repeated in cases, wherein in method step c) the assessment reveals that the applied heat sensitive coloring indicator amount is lower or equal to 90 mol % of the predetermined heat sensitive coloring indicator amount.