LITHIUM SILICATE GLASS CERAMIC AND GLASS WITH ZrO2 CONTENT

Patent metadata

Field	Value
Publication number	US-2020156989-A1
Application number	US-202016748143-A
Country	US
Kind code	A1
Filing date	Jan 21, 2020
Priority date	Apr 16, 2010
Publication date	May 21, 2020
Grant date	—

Abstract

Lithium silicate glass ceramics and glasses are described which can advantageously be applied to zirconium oxide ceramics in particular by pressing-on in the viscous state and form a solid bond with these.

First claim

What is claimed is:

1 ) A method comprising:
hot pressing i) a monolithic blank comprising lithium disilicate as the main crystalline phase, ii) a monolithic blank comprising lithium metasilicate as the main crystalline phase, or iii) or a monolithic blank with nuclei for lithium metasilicate and/or lithium disilicate formation, wherein a monolithic dental restoration is formed.

2 ) The method of claim 1 , further comprising
forming a monolithic blank with nuclei for lithium metasilicate and/or lithium disilicate formation; and heating the monolithic blank with nuclei for lithium metasilicate and/or lithium disilicate formation to form the monolithic blank comprising lithium disilicate.

3 ) The method of claim 2 , wherein the forming comprises:
mixing oxide and/or carbonate precursors and, optionally, at least one coloring pigment; heating the mixture of oxide and/or carbonate precursors to form a first glass melt; contacting the first glass melt with water to form glass granules; melting the glass granules to form a second glass melt; forming a monolithic blank from the second glass melt; and heating the monolithic blank to form a monolithic blank with nuclei for lithium metasilicate and/or lithium disilicate formation.

4 ) The method of claim 1 , further comprising:
prior to hot pressing, heating the monolithic blank with nuclei for lithium metasilicate and/or lithium disilicate formation at 650 to 750 ° C. at a heating rate of 15° C./minute to form a monolithic blank comprising lithium metasilicate as the main crystalline phase.

5 ) The method of claim 4 , further comprising:
heating the monolithic blank comprising lithium metasilicate as the main crystalline phase at 840 to 880° C. for 5 to 30 minutes to form a monolithic blank comprising lithium disilicate as the main crystalline phase.

6 ) The method of claim 1 , wherein the hot pressing is carried out at a temperature of 900 to 950° C.

7 ) The method of claim 1 , wherein the dental restoration is an inlay, onlay, crown, or abutment.

8 ) The method of claim 1 , wherein the monolithic blank comprising lithium disilicate as the main crystalline phase comprises lithium disilicate glass ceramic with 55 to 71 weight percent SiO 2 , 9 to 17 weight percent Li 2 O, and at least 6.1 weight percent ZrO 2 based on a mass of the lithium disilicate glass ceramic.

9 ) The method of claim 8 , wherein the lithium disilicate glass ceramic has a SiO 2 /Li 2 O molar ratio of 1.8 to 3.

10 ) The method of claim 9 , wherein the lithium disilicate glass ceramic has a SiO 2 /Li 2 O molar ratio of 2.1 to 2.6.

11 ) The method of claim 8 , wherein the lithium disilicate glass ceramic comprises 6.1 to 16 weight percent ZrO 2 based on the mass of the lithium disilicate glass ceramic.

12 ) The method of claim 11 , wherein the lithium disilicate glass ceramic comprises 6.1 to 12 weight percent ZrO 2 based on the mass of the lithium disilicate glass ceramic.

13 ) The method of claim 8 , wherein the lithium disilicate glass ceramic further comprises Y 2 O 3 , and wherein the lithium disilicate glass ceramic includes a combined amount of ZrO 2 and Y 2 O 3 of greater than 6.1 to 16 weight percent based on the mass of the lithium disilicate glass ceramic.

14 ) The method of claim 13 , wherein the lithium disilicate glass ceramic includes a combined amount of ZrO 2 and Y 2 O 3 of greater than 6.1 to 12 weight percent based on the mass of the lithium disilicate glass ceramic.

15 ) The method of claim 1 , wherein the lithium disilicate glass ceramic further comprises an oxide of pentavalent elements, wherein the oxide of the pentavalent elements is Bi 2 O 5 .

16 ) The method of claim 1 , wherein the lithium disilicate glass ceramic further comprises an oxide of hexavalent elements selected from WO 3 or MoO 3 .

17 ) The method of claim 1 , wherein no Na 2 O oxide is present in the lithium disilicate glass ceramic.

18 ) The method of claim 1 , wherein the lithium disilicate glass ceramic further comprises at least 0.2 weight percent to less than 5.0 weight percent Al 2 O 3 .

19 ) The method of claim 1 , wherein the lithium disilicate glass ceramic has a biaxial strength of from 200 to 500 MPa.

20 ) The method of claim 1 , wherein the lithium disilicate glass ceramic includes lithium silicate crystals with a small-plate shaped crystal form.

Assignees

• Ivoclar Vivadent Ag

Inventors

• Ritzberger Christian
• Dellagiacomo Ricardo
• Schweiger Marcel
• Bürke Harald
• Höland Wolfram
• Rheinberger Volker

Classifications

• A61C13/082

  Cosmetic aspects, e.g. inlays; Determination of the colour (A61C19/10 takes precedence) · CPC title

• C04B37/042

  in a direct manner · CPC title

• A61K6/813

  comprising iron oxide · CPC title

• A61K6/818

  comprising zirconium oxide · CPC title

• A61K6/822

  comprising rare earth metal oxides · CPC title