Lithium silicate materials

Patent metadata

Field	Value
Publication number	US-11369460-B2
Application number	US-202016997050-A
Country	US
Kind code	B2
Filing date	Aug 19, 2020
Priority date	Aug 7, 2003
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

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

First claim

The invention claimed is:

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 to a dental restoration having a biaxial flexural strength from 250 to 472 MPa measured according to ISO 6872 and exhibiting a final lithium disilicate phase.

4. A dental restoration milled from the lithium silicate dental glass-ceramic article of claim 3 , wherein the dental restoration is 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 MPam 0.5 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 to a dental restoration having a biaxial flexural strength from 250-472 MPa measured according to ISO 6872 and exhibiting a final lithium disilicate phase.

8. A dental restoration milled from the lithium silicate dental glass-ceramic article of claim 7 , wherein the dental restoration is 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 to a dental restoration having a biaxial flexural strength between 250-472 MPa measured according to ISO 6872 and exhibiting a final lithium disilicate phase.

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

11. A dental restoration milled from 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

• A61C5/77

  Methods or devices for making crowns · CPC title

• A61K6/802

  comprising ceramics · CPC title

• C03C4/0021

  for dental use · CPC title

• A61C13/0022

  Blanks or green, unfinished dental restoration parts · CPC title

• C03B19/02

  by casting {molten glass, e.g. injection moulding} · CPC title