Lithium silicate diopside glass ceramics

Patent metadata

Field	Value
Publication number	US-10457589-B2
Application number	US-201615546455-A
Country	US
Kind code	B2
Filing date	Jan 21, 2016
Priority date	Jan 30, 2015
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

Lithium silicate-diopside glass ceramics are described which are characterized by a controllable translucence and can be satisfactorily processed mechanically and therefore can be used in particular as restoration material in dentistry.

First claim

The invention claimed is:

1. Lithium silicate-diopside glass ceramic which comprises 2.0 to 8.0 wt.-% P 2 O 5 and comprises lithium silicate as main crystal phase and diopside as further crystal phase.

2. Glass ceramic according to claim 1 , which comprises 53.0 to 75.0 wt.-% SiO 2 .

3. Glass ceramic according to claim 1 , which comprises 10.0 to 23.0 wt.-% Li 2 O.

4. Glass ceramic according to claim 1 , which comprises 1.0 to 13.0 wt.-% CaO and/or 1.0 to 12.0 wt.-% MgO.

5. Glass ceramic according to claim 4 , wherein the molar ratio of CaO to MgO is 0.5 to 2.0.

6. Glass ceramic according to claim 1 , which comprises 0 to 10.0 wt.-% further alkali metal oxide Me I 2 O, wherein Me I 2 O is selected from Na 2 O, K 2 O, Rb 2 O and/or Cs 2 O.

7. Glass ceramic according to claim 1 , which comprises 0 to 10.0 wt.-% oxide of trivalent elements Me III 2 O 3 , wherein Me III 2 O 3 is selected from Al 2 O 3 , B 2 O 3 , Y 2 O 3 , La 2 O 3 , Ga 2 O 3 and/or In 2 O 3 .

8. Glass ceramic according to claim 1 , which comprises the following components:

Component
wt.-%

SiO 2
53.0 to 75.0

Li 2 O
10.0 to 23.0

CaO
1.0 to 13.0

MgO
1.0 to 12.0

P 2 O 5
2.0 to 8.0

Me I 2 O
  0 to 10.0

Me II O
  0 to 10.0

Me III 2 O 3
  0 to 10.0

Me IV O 2
  0 to 15.0

Me V 2 O 5
  0 to 4.0

Me VI O 3
  0 to 5.0

fluorine
  0 to 3.0,

wherein
Me I 2 O is selected from Na 2 O, K 2 O, Rb 2 O and/or Cs 2 O,
Me II O is selected from SrO and/or ZnO,
Me III 2 O 3 is selected from Al 2 O 3 , B 2 O 3 , Y 2 O 3 , La 2 O 3 , Ga 2 O 3 and/or In 2 O 3 ,
Me IV O 2 is selected from ZrO 2 , GeO 2 , CeO 2 , TiO 2 and/or SnO 2 ,
Me V 2 O 5 is selected from V 2 O 5 , Ta 2 O 5 and/or Nb 2 Os, and
Me VI O 3 is WO 3 and/or MoO 3 .

9. Glass ceramic according to claim 1 , which comprises lithium silicate in the form of lithium disilicate and/or lithium metasilicate.

10. Glass ceramic according to claim 1 , which is present in the form of a blank or a dental restoration.

11. Glass ceramic according to claim 1 , which comprises 3.0 to 6.0 wt.-% P 2 O 5 .

12. Starting glass which comprises the following components:

Component
wt.-%

SiO 2
53.0 to
75.0

Li 2 O
10.0 to
23.0

CaO
1.0 to
13.0

MgO
1.0 to
12.0

Al 2 O 3
0.1 to
8.0

P 2 O 5
0 to
8.0

Me I 2 O
0 to
10.0

Me II O
0 to
10.0

Me III 2 O 3
0.1 to
10.0

Me IV O 2
0 to
15.0

Me V 2 O 5
0 to
4.0

Me VI O 3
0 to
5.0

fluorine
0 to
3.0,

wherein
Me I 2 O is selected from Na 2 O, K 2 O, Rb 2 O and/or Cs 2 O,
Me II O is selected from SrO and/or ZnO,
Me III 2 O 3 is selected from Al 2 O 3 , B 2 O 3 , Y 2 O 3 , La 2 O 3 , Ga 2 O 3 and/or In 2 O 3 ,
Me IV O 2 is selected from ZrO 2 , GeO 2 , CeO 2 , TiO 2 and/or SnO 2 ,
Me V 2 O 5 is selected from V 2 O 5 , Ta 2 O 5 and/or Nb 2 Os, and
Me V O 3 is WO 3 and/or MoO 3 , and
comprises nuclei for the crystallization of lithium metasilicate or lithium disilicate as main crystal phase and diopside as further crystal phase.

13. Starting glass according to claim 12 , which is present in the form of a ground powder or a compact made of ground powder.

14. Process for the preparation of a lithium silicate-diopside glass ceramic which comprises lithium silicate as main crystal phase and diopside as further crystal phase, wherein
(a) a starting glass is ground,
(b) the ground starting glass is optionally pressed to form a powder green compact and
(c) the ground starting glass or the powder green compact is subjected to at least one heat treatment at a temperature in the range of from 500° to 1000° C. for a period of from 5 to 120 min.

15. Lithium silicate-diopside glass ceramic, which comprises 53.0 to 70.0 wt.-%

Assignees

• Ivoclar Vivadent Ag

Inventors

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

Classifications

• A61K6/833

  Glass-ceramic composites · CPC title

• C03C3/112

  containing fluorine · CPC title

• C03C3/078 Primary

  containing an oxide of a divalent metal, e.g. an oxide of zinc · CPC title

• C03C8/06 Primary

  containing halogen · CPC title

• C03C3/097

  containing phosphorus, niobium or tantalum · CPC title