# US 10,765,496 B2 · Lithium disilicate glass-ceramic, method for production thereof and use thereof

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- Number: US 10,765,496 B2
- Document ID: US10765496B2
- Status: Granted
- Kind: B2
- Application number: 16/227,429
- Filed: 2018-12-20
- Published: 2019-05-16
- Granted: 2020-09-08
- Earliest claimed: 2009-12-23
- Assignees: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.; Vita Zahnfabrik H. Rauter GmbH & Co. KG; Degundent GmbH
- Applicants: FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V.; VITA Zahnfabrik H. Rauter GmbH & Co. KG; DeguDent GmbH
- Inventors: Bernhard Durschang; Jörn Probst; Norbert Thiel; Joachim Bibus; Markus Vollmann; Udo Schusser
- Web page: https://patentgrep.com/patent/US10765496B2

## CPC

- A61K 6/818: comprising zirconium oxide
- G01J 1/44: Electric circuits {(for command of an exposure part G03B7/02)}
- A61C 5/35: Pins; Mounting tools or dispensers therefor
- A61C 5/70: Tooth crowns; Making thereof
- A61C 5/77: Methods or devices for making crowns
- A61C 13/0006: {Production methods}
- A61C 13/01: Palates or other bases or supports for the artificial teeth; Making same
- A61C 13/083: Porcelain or ceramic teeth {(A61C13/081 takes precedence; preparations A61K6/80)}
- A61K 6/78: Pigments
- A61K 6/816: comprising titanium oxide
- A61K 6/82: comprising hafnium oxide
- A61K 6/822: comprising rare earth metal oxides
- A61K 6/824: comprising transition metal oxides
- A61K 6/833: Glass-ceramic composites
- C03B 32/02: Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles {(C03B27/012 takes precedence)}
- C03C 3/097: containing phosphorus, niobium or tantalum
- C03C 4/0021: {for dental use}
- C03C 10/0027: {containing SiO2, Al2O3, Li2O as main constituents}
- 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)
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- 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)
- C03B: MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- 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

## Abstract

The invention relates to glass-ceramics based on the lithium silicate system which can be mechanically machined easily in an intermediate step of crystallisation and, after complete crystallisation, represent a very strong, highly-translucent and chemically-stable glass-ceramic. Likewise, the invention relates to a method for the production of these glass-ceramics. The glass-ceramics according to the invention are used as dental material.

## Claims

### Claim 1

A lithium silicate glass ceramic that includes at least 10 wt % ZrO2, from 55 to 70 wt % SiO2, and from 10 to 15 wt % LiO2 and having a main crystal phase consisting of lithium disilicate crystal.

### Claim 2 (depends on 1)

Lithium silicate glass ceramic of claim 1, which is in the form of a dental restoration.