Lithium silicate materials

Patent metadata

Field	Value
Publication number	US-2024099819-A1
Application number	US-202318457268-A
Country	US
Kind code	A1
Filing date	Aug 28, 2023
Priority date	Aug 7, 2003
Publication date	Mar 28, 2024
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.

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 between 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

• A61C13/083 Primary

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

• A61C5/77

  Methods or devices for making crowns · CPC title

• A61C13/0006

  Production methods · CPC title

• A61C13/0022

  Blanks or green, unfinished dental restoration parts · CPC title

• A61C13/09

  {Composite teeth, e.g. front and back section (A61C13/0835, A61C13/1023 take precedence)}; Multilayer teeth · CPC title