Lithium silicate materials

Patent metadata

Field	Value
Publication number	US-2022323185-A1
Application number	US-202217809225-A
Country	US
Kind code	A1
Filing date	Jun 27, 2022
Priority date	Aug 7, 2003
Publication date	Oct 13, 2022
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

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title

• C03B19/02

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

• C03C2217/92

  Coating of crystal glass · CPC title

• C03C10/0009

  containing silica as main constituent · CPC title

• C03B32/02

  Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles {(C03B27/012 takes precedence)} · CPC title