# US 11,440,834 B2 · Fluorescent glass ceramics and glasses with europium content > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,440,834 B2 - Document ID: US11440834B2 - Status: Granted - Kind: B2 - Application number: 16/784,824 - Filed: 2020-02-07 - Published: 2020-08-20 - Granted: 2022-09-13 - Earliest claimed: 2019-02-14 - Assignees: Ivoclar Vivadent AG - Applicants: Ivoclar Vivadent AG - Inventors: Marc Dittmer; Ronny Hengst; Christian Ritzberger - Web page: https://patentgrep.com/patent/US11440834B2 ## CPC - C03C 3/085: containing an oxide of a divalent metal - C03C 3/095: containing rare earths - 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 6/822: comprising rare earth metal oxides - A61K 6/833: Glass-ceramic composites - A61K 6/836: Glass - C03C 3/062: with less than 40% silica by weight - C03C 3/087: containing calcium oxide, e.g. common sheet or container glass - C03C 4/0021: {for dental use} - C03C 4/12: for luminescent glass; for fluorescent glass - C03C 10/0036: {containing SiO2, Al2O3 and a divalent metal oxide as main constituents} - C03C 2201/36: containing rare earth metals and aluminium, e.g. Er-Al co-doped - C03C 2205/06: for dental use - C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS - 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 The invention relates to glass ceramics and glasses with a europium content, containing the following components: Component wt.-% SiO2 30.0 to 75.0 Al2O3 10.0 to 45.0 Europium, calculated as Eu2O3 0.05 to 5.0 and which are suitable in particular for the production of restorations, the fluorescence properties of which largely correspond to those of natural teeth. ## Claims ### Claim 1 Process for the preparation of a dental restoration, which process comprises giving a glass ceramic with europium content or a glass ceramic comprising the glass ceramic with europium content the shape of the desired dental restoration by pressing, sintering or machining, wherein the glass ceramic with europium content comprises the following components: Component wt.-% SiO2 30.0 to 75.0 Al2O3 15.0 to 45.0 Europium, calculated as Eu2O3 0.05 to 5.0. ### Claim 2 (depends on 1) Process according to claim 1 wherein the glass ceramic comprises 32.0 to 72.0 wt.-% SiO2. ### Claim 3 (depends on 1) Process according to claim 1 wherein the glass ceramic comprises 15.0 to 40.0 wt.-% Al2O3. ### Claim 4 (depends on 1) Process according to claim 1 wherein the glass ceramic comprises 0.1 to 4.0 wt.-% europium, calculated as Eu2O3. ### Claim 5 (depends on 1) Process according to claim 1 wherein the glass ceramic comprises 8.0 to 30.0 wt.-% MeIIO, wherein MeIIO is selected from MgO, CaO, SrO and ZnO. ### Claim 6 (depends on 1) Process according to claim 1 wherein the glass ceramic comprises 8.0 to 30.0 wt.-% oxide selected from CaO and SrO. ### Claim 7 (depends on 1) Process according to claim 1 wherein the glass ceramic comprises at least one of the following components in the specified amounts: Component wt.-% MgO 0 to 13.0 CaO 0 to 22.0 SrO 0 to 28.0 ZnO 0 to 5.0. ### Claim 8 (depends on 1) Process according to claim 1 wherein the glass ceramic comprises 0 to 10.0 wt.-% BaO. ### Claim 9 (depends on 1) Process according to claim 1 wherein the glass ceramic comprises 0 to 2.0 wt.-% tin, calculated as SnO. ### Claim 10 (depends on 1) Process according to claim 1 wherein the glass ceramic comprises 0 to 5.0 wt.-% cerium, calculated as CeO2. ### Claim 11 (depends on 1) Process according to claim 1 wherein the glass ceramic comprises 0 to 3.0 wt.-% B2O3. ### Claim 12 (depends on 1) Process according to claim 1 wherein the glass ceramic comprises at least one of the following components in the specified amounts: Component wt.-% SiO2 32.0 to 72.0 Al2O3 15.0 to 40.0 Europium, calculated as Eu2O3 0.1 to 4.0 Cerium, calculated as CeO2 0 to 5.0 Tin, calculated as SnO 0 to 2.0 MeI2O 0 to 15.0 MeIIO 0 to 30.0 MeIII2O3 0 to 10.0 MeIVO2 0 to 15.0 MeV2O5 0 to 6.0 MeVIO3 0 to 6.0 Fluorine 0 to 5.0, wherein MeI2O is selected from Li2O, Na2O, K2O, Rb2O and Cs2O, MeIIO is selected from MgO, CaO, SrO and ZnO, MeIII2O3 is selected from Y2O3, La2O3, Ga2O3 and In2O3, MeIVO2 is selected from ZrO2 and GeO2, MeV2O5 is selected from P2O5, V2O5, Ta2O5 and Nb2O5 and MeVIO3 is selected from WO3 and MoO3. ### Claim 13 (depends on 1) Process according to claim 1 wherein the glass ceramic comprises at least one aluminosilicate as crystal phase. ### Claim 14 (depends on 1) Process according to claim 1 wherein the glass ceramic comprises at least 5 wt.-% aluminosilicate as crystal phase. ### Claim 15 (depends on 1) Process according to claim 1 further comprising a step in which a glass comprising the following components: Component wt.-% SiO2 30.0 to 75.0 Al2O3 10.0 to 45.0 Europium, calculated as Eu2O3 0.05 to 5.0. is subjected to at least one heat treatment at a temperature of from 1000 to 1500° C. ### Claim 16 (depends on 1) Process according to claim 1 wherein the glass ceramic is present in the form of a powder, a granulate or a blank. ### Claim 17 (depends on 1) Process according to claim 1 wherein the glass ceramic exhibit fluorescence at an excitation wavelength in the range of from 250 nm to 430 nm. ### Claim 18 (depends on 15) Process according to claim 15 wherein the glass comprises nuclei for the crystallization of an aluminosilicate. ### Claim 19 (depends on 15) Process according to claim 15, in which (a) powder of the glass, optionally after the addition of further components, is pressed to form a powder compact, and (b) the powder compact is subjected to a heat treatment at a temperature of from 1000 to 1500° C. ### Claim 20 (depends on 1) Process according to claim 1 comprising using the glass ceramic as blending component for setting the fluorescence of a glass or of a glass ceramic. ### Claim 21 (depends on 1) Process according to claim 1, wherein the dental restoration comprises an inlay, onlay, crown, partial crown, bridge, veneer, facet or abutment.