Lithium silicate glass ceramics and lithium silicate glass containing cesium oxide

Patent metadata

Field	Value
Publication number	US-9757311-B2
Application number	US-201414766607-A
Country	US
Kind code	B2
Filing date	Apr 8, 2014
Priority date	Apr 15, 2013
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

The invention relates to the use of lithium silicate glass ceramics and glasses with caesium oxide content, which are suitable in particular for veneering oxide ceramic restorations and metal restorations.

First claim

The invention claimed is:

1. Process of using a lithium silicate glass ceramic or a lithium silicate glass which comprise the following components

Component
wt.-%

SiO 2
54.0 to 78.0

Li 2 O
11.0 to 19.0

Cs 2 O
4.4 to 13.0

Al 2 O 3
1.0 to 9.0

P 2 O 5
0.5 to 9.0,

for coating a substrate selected from oxide ceramics, metals and alloys.

2. Process according to claim 1 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise at least one of the following components in the given amounts

Component
wt.-%

SiO 2
55.1 to 77.1

Li 2 O
11.8 to 17.8

Cs 2 O
4.4 to 11.7

Al 2 O 3
1.7 to 8.0

P 2 O 5
1.3 to 7.5

ZrO 2
0 to 4.5

Transition metal oxide
0 to 7.5,

wherein the transition metal oxide is selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides.

3. Process according to claim 1 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise up to 70.0 wt.-% SiO 2 .

4. Process according to claim 1 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 5.0 to 10.0 wt.-% Cs 2 O.

5. Process according to claim 1 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 2.0 to 6.0 wt.-% Al 2 O 3 .

6. Process according to claim 1 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 4.0 wt.-% Na 2 O and/or K 2 O.

7. Process according to claim 1 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 2.5 wt.-% Rb 2 O.

8. Process according to claim 1 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 3.8 wt.-% BaO.

9. Process according to claim 1 , in which a lithium silicate glass ceramic is used which comprises lithium metasilicate as main crystal phase.

10. Process according to claim 1 , in which a lithium silicate glass ceramic is used which comprises lithium disilicate as main crystal phase.

11. Process of using a lithium silicate glass ceramic which comprises the following components

Component
wt.-%

SiO 2
54.0 to 78.0

Li 2 O
11.0 to 19.0

Cs 2 O
 4.0 to 13.0

Al 2 O 3
1.0 to 9.0

P 2 O 5
 0.5 to 9.0,

for coating a substrate selected from oxide ceramics, metals and alloys,
in which the lithium silicate glass ceramic comprises at least one caesium aluminosilicate crystal phase.

12. Process of using a lithium silicate glass ceramic which comprises the following components

Component
wt.-%

SiO 2
54.0 to 78.0

Li 2 O
11.0 to 19.0

Cs 2 O
 4.0 to 13.0

Al 2 O 3
1.0 to 9.0

P 2 O 5
 0.5 to 9.0,

for coating a substrate selected from oxide ceramics, metals and alloys,
in which the lithium silicate glass ceramic comprises at least one lithium aluminosilicate crystal phase.

13. Process according to claim 1 , in which a lithium silicate glass is used, wherein the lithium silicate glass comprises nuclei which are suitable for forming lithium metasilicate and/or lithium disilicate crystals.

14. Process according to claim 1 , in which the substrate is an oxide ceramic.

15. Process of using a lithium silicate glass ceramic which comprises the following components

Component
wt.-%

Assignees

• Ivoclar Vivadent Ag

Inventors

• Rampf Markus
• Dittmer Marc
• Höland Wolfram
• Bolle Urs
• Schweiger Marcel
• Rheinberger Volker
• Ritzberger Christian

Classifications

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title

• A61K6/833

  Glass-ceramic composites · CPC title

• A61K6/824

  comprising transition metal oxides · CPC title

• A61K6/802 Primary

  comprising ceramics · CPC title

• A61K6/853

  Silicates · CPC title