Lithium silicate materials

Patent metadata

Field	Value
Publication number	US-2020375707-A1
Application number	US-202016997050-A
Country	US
Kind code	A1
Filing date	Aug 19, 2020
Priority date	Aug 7, 2003
Publication date	Dec 3, 2020
Grant date	—

Abstract

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools.

First claim

1 . A lithium silicate dental glass-ceramic article for producing a dental restoration comprising: metasilicate as the main crystalline phase with 20-50 vol % lithium metasilicate crystalline phase and exhibiting a biaxial flexural strength of at least 90 MPa measured according to ISO 6872.

2 . The lithium silicate dental glass-ceramic article of claim 1 , wherein the article is a blank that is fixed to a holder.

3 . The lithium silicate dental glass-ceramic article of claim 2 , wherein the blank is millable and sinterable to a dental restoration exhibiting a final lithium disilicate phase having a biaxial flexural strength between 250-472 MPa+/−85 measured according to ISO 6872.

4 . The lithium silicate blank of claim 3 , wherein the blank is milled and sintered into an inlay, an onlay, a bridge, an abutment, a facing, a veneer, a facet, a crown, a partial crown, a framework, or a coping.

5 . A lithium silicate dental glass-ceramic article for producing a dental restoration comprising: 20-50 vol % lithium metasilicate crystalline phase, exhibiting edge strength with a fracture toughness of at least 0.8 MPam0.5 and a biaxial flexural strength of at least 90 MPa measured according to ISO 6872.

6 . The lithium silicate dental glass-ceramic article of claim 5 , wherein the article is a blank that is fixed is fixed to a holder.

7 . The lithium silicate dental glass-ceramic article of claim 6 , wherein the blank is millable and sinterable to a dental restoration exhibiting a final lithium disilicate phase having a biaxial flexural strength between 250-472 MPa+/−85 measured according to ISO 6872.

8 . The lithium silicate dental glass-ceramic article of claim 7 , whereon the blank is milled and sintered into an inlay, an onlay, a bridge, an abutment, a facing, a veneer, a facet, a crown, a partial crown, a framework, or a coping.

9 . A lithium silicate dental glass-ceramic article for producing a dental restoration comprising: an initial phase comprising metasilicate as the main crystalline phase with 20-50 vol % lithium metasilicate crystalline phase and exhibiting a biaxial flexural strength of at least 90 MPa measured according to ISO 6872, the initial phase is millable and sinterable to a dental restoration exhibiting a final lithium disilicate phase having a biaxial flexural strength between 250-472 MPa+/−85 measured according to ISO 6872.

10 . The lithium silicate dental glass-ceramic article of claim 9 , wherein the article is a blank that is fixed to a holder.

11 . The lithium silicate dental glass-ceramic article of claim 10 , wherein the blank is milled and sintered into an inlay, an onlay, a bridge, an abutment, a facing, a veneer, a facet, a crown, a partial crown, a framework, or a coping.

Assignees

• Ivoclar Vivadent Ag

Inventors

• Schweiger Marcel
• Rheinberger Volker
• Bürke Harald
• Höland Wolfram
• Signer-Apel Elke
• Ritzberger Christian
• Brodkin Dmitri

Classifications

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title

• A61C5/77

  Methods or devices for making crowns · CPC title

• A61C13/083 Primary

  Porcelain or ceramic teeth {(A61C13/081 takes precedence; preparations A61K6/80)} · CPC title

• A61K6/802

  comprising ceramics · CPC title

• C03C10/0027

  containing SiO2, Al2O3, Li2O as main constituents · CPC title