Lithium silicate glass ceramic and glass with rubidium oxide content

Patent metadata

Field	Value
Publication number	US-10376343-B2
Application number	US-201414784149-A
Country	US
Kind code	B2
Filing date	Apr 8, 2014
Priority date	Apr 15, 2013
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

The invention relates to the use of lithium silicate glass ceramics and glasses with rubidium oxide content for coating an oxide ceramic, a metal or an alloy.

First claim

The invention claimed is:

1. Composite material which comprises a lithium silicate glass ceramic or a lithium silicate glass, which comprise the following components

Component
wt.-%

SiO 2
56.0 to 73.0

Li 2 O
13.0 to 19.0

Rb 2 O
3.0 to 9.0

A1 2 O 3
2.0 to 5.0

P 2 O 5
2.0 to 6.0

ZrO 2
  0 to 4.5

on a substrate selected from oxide ceramics, metals and alloys.

2. Composite material according to claim 1 , wherein the substrate is a dental restoration.

3. Process for coating a substrate selected from oxide ceramics, metals and alloys, in which a lithium silicate glass ceramic or a lithium silicate glass which comprise the following components

Component
wt.-%

SiO 2
56.0 to 73.0

Li 2 O
13.0 to 19.0

Rb 2 O
3.0 to 9.0

A1 2 O 3
2.0 to 5.0

P 2 O 5
2.0 to 6.0

ZrO 2
  0 to 4.5

is applied to the substrate.

4. Process according to claim 3 , 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
56.9 to 72.0

Li 2 O
14.2 to 18.0

Rb 2 O
3.7 to 7.7

Al 2 O 3
2.5 to 4.5

P 2 O 5
3.1 to 5.0

ZrO 2
  0 to 4.0

Transition
   0 to 7.5,

metal oxide

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.

5. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 58.0 to 72.0 wt.-% SiO 2 .

6. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 3.7 to 7.7 wt.-% Rb 2 O.

7. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise 2.5 to 4.0 wt.-% Al 2 O 3 .

8. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 2.5 wt.-% Cs 2 O.

9. Process according to claim 3 , 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.

10. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium silicate glass comprise less than 3.8 wt.-% BaO.

11. Process according to claim 3 , in which a lithium silicate glass ceramic is used which comprises lithium metasilicate as main crystal phase and has a bending strength in the range of about 180 to 300 MPa and/or a fracture toughness, measured as K IC value, of at least about 2.0 MPa·m 0.5 .

12. Process according to claim 11 , wherein the fracture toughness, measured as K IC value, is at least about 2.3 MPa·m 0.5 .

13. Process according to claim 3 , in which a lithium silicate glass ceramic is used which comprises lithium disilicate as main crystal phase and has a bending strength in the range of about 400 to 700 MPa and/or a fracture toughness, measured as K IC value, of at least about 2.0 MPa·m 0.5 .

14. Process according to claim 13 , wherein the fracture toughness, measured as K IC value, is at least about 2.3 MPa·m 0.5 .

15. Process according to claim 3 , in which a lithium silicate glass is used.

16. Process according to claim 15 , wherein the lithium silicate glass comprises nuclei which are suitable for forming lithium metasilicate and/or lithium disilicate crystals.

17. Process according to claim 3 , in which the substrate is an oxide ceramic.

18. Process according to claim 17 , in which the substrate comprises a zirconium oxide ceramic.

19. Process according to claim 3 , in which the substrate is a metal or an alloy.

20. Process according to claim 19 , wherein the alloy comprises a non-precious metal alloy.

21. Process according to claim 3 , in which the substrate is a dental restoration.

22. Process according to claim 21 , wherein the dental restoration comprises a bridge, an inlay, an onlay, a veneer, an abutment, a partial crown, a crown or a facet.

23. Process according to claim 3 , in which the lithium silicate glass ceramic or the lithium s

Assignees

• Ivoclar Vivadent Ag

Inventors

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

Classifications

• A61K6/822

  comprising rare earth metal oxides · CPC title

• A61K6/802

  comprising ceramics · CPC title

• A61K6/833

  Glass-ceramic composites · CPC title

• A61K6/816

  comprising titanium oxide · CPC title

• A61K6/78

  Pigments · CPC title