Lithium disilicate apatite glass-ceramic

Patent metadata

Field	Value
Publication number	US-2016257607-A1
Application number	US-201615156385-A
Country	US
Kind code	A1
Filing date	May 17, 2016
Priority date	May 4, 2012
Publication date	Sep 8, 2016
Grant date	—

Abstract

Lithium disilicate apatite glass-ceramics are described which are characterized by a high chemical stability and can therefore be used in particular as restoration material in dentistry.

First claim

1 . Lithium disilicate apatite glass-ceramic, which comprises lithium disilicate as main crystal phase and apatite as further crystal phase and which comprises 3.0 to 7.0 wt.-% K 2 O.

2 . Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 60.0 to 74.0 wt.-% SiO 2 .

3 . Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 10.0 to 20.0 wt.-% Li 2 O.

4 . Lithium disilicate apatite glass-ceramic according to claim 1 , which contains 3.0 to 7.0 wt.-% P 2 O 5 .

5 . Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 0 to 5.0 wt.-% CaO and 0 to 4.0 wt.-% SrO, wherein the combined amount of CaO and SrO is 1.5 to 5.5 wt.-%.

6 . Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 0.1 to 1.0 wt.-% F.

7 . Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 2.0 to 7.0 wt.-% oxide of trivalent elements and/or further oxide of tetravalent elements.

8 . Lithium disilicate apatite glass-ceramic according to claim 7 , wherein the oxide of trivalent elements is selected from the group of Al 2 O 3 , Y 2 O 3 , La 2 O 3 and mixtures thereof.

9 . Lithium disilicate apatite glass-ceramic according to claim 7 , wherein the further oxide of tetravalent elements is selected from the group of ZrO 2 , TiO 2 , GeO 2 and mixtures thereof.

10 . Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises at least one of the following components:

Component
wt.-%

SiO 2
60.0 to 74.0

Li 2 O
10.0 to 20.0

P 2 O 5
3.0 to 7.0

K 2 O
3.0 to 7.0

CaO
0 to 5.0

SrO
0 to 4.0

F
0.1 to 1.0

Oxide of trivalent elements and/or further
2.0 to 7.0

oxide of tetravalent elements

wherein

CaO + SrO is
1.5 to 5.5.

11 . Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises fluoroapatite as apatite.

12 . Lithium disilicate apatite glass ceramic which comprises lithium disilicate as main crystal phase and apatite as further crystal phase, which comprises 3.0 to 7.0 wt.-% K 2 O, and which comprises more than 20 vol.-% lithium disilicate crystals.

13 . Starting glass, which comprises the components of the glass-ceramic according to claim 1 .

14 . Starting glass according to claim 13 , which comprises nuclei for the crystallization of lithium metasilicate, lithium disilicate and/or apatite.

15 . Lithium metasilicate glass-ceramic, which comprises lithium metasilicate as main crystal phase and apatite as further crystal phase and which comprises 3.0 to 7.0 wt.-% K 2 O.

16 . Glass-ceramic according to claim 1 , wherein the glass-ceramic is present in the form of a powder, a granulate, a blank or a dental restoration.

17 . Process for the preparation of the glass-ceramic according to claim 1 , wherein a starting glass or a lithium metasilicate glass-ceramic is subjected to at least one heat treatment in the range of from 430° to 1000° C.

18 . Process according to claim 17 , wherein
(a) the starting glass is subjected to a heat treatment at a temperature of from 430 to 550° C. in order to form starting glass with nuclei, and (b) the starting glass with nuclei is subjected to a heat treatment at a temperature of from 750 to 950° C. in order to form the lithium disilicate apatite glass-ceramic.

19 . Process of using the glass-ceramic according to claim 1 , as dental material comprising coating dental restorations and preparing dental restorations.

20 . Process of using the glass-ceramic according to claim 19 , wherein the process comprises pressing or machining, the shape of the desired dental restoration, bridge, inlay, onlay, veneer, abutment, partial crown, crown or shell.

21 . Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 3.5 to 6.0 wt.-% K 2 O.

22 . Lithium disilicate apatite glass-ceramic according to claim 2 , which comprises 63.0 to 71.0 wt.-% SiO 2 .

23 . Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 11.0 to 19.0 wt.-% Li 2 O.

24 . Lithium disilicate apatite glass-ceramic according to claim 1 , which contains 4.0 to 6.0 wt.-% P 2 O 5 .

25 . Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 0 to 4.5 wt.-% CaO and 0 to 3.5 wt.-% SrO, wherein the combined amount of CaO and SrO is 1.5 to 5.5 wt.-%.

26 . Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 0.2 to 0.5 wt.-% F.

27 . Lithium disilicate apatite glass-ceramic according to claim 1 , which comprises 3.0 to 6.0 wt.-% oxide of trivalent elements and/or further oxide of tetravalent elements.

28 . Lithium disilicate apatite glass-ceramic according to claim 7 , wherein the oxide of trivalent elements is selected from the group of Al 2 O 3 , Y 2 O 3 , La 2 O 3 and mixtures thereof.

29 . Lithium disilicate apatite glass ceramic according to claim 1 , which comprises more than 25 vol.-% lithium disilicate crystals.

30 . Lithium disilicate apatite glass ceramic according to claim 1 , which comprises more than 30 vol.-% lithium disilicate crystals.

31 . Starting glass according to claim 13 , wherein the starting glass is present in the form of a powder, a granulate, a blank or a dental restoration.

32 . Lithium metasilicate glass-ceramic according to claim 15 , wherein the lithium metasilicate glass-ceramic is present in the form of a powder, a granulate, a blank or a dental restoration.

33 . Process of using the starting glass according to claim 13 as dental material comprising coating dental restorations and preparing dental restorations.

34 . Process of using the lithium metasilicate glass-ceramic according to claim 15 as dental material comprising coating dental re

Assignees

• Ivoclar Vivadent Ag

Inventors

• Ritzberger Christian
• Holand Wolfram
• Schweiger Marcel
• Rheinberger Volker

Classifications

• C03C4/0007

  for biologically-compatible glass · CPC title

• C03C10/0009 Primary

  containing silica as main constituent · CPC title

• C03C3/097

  containing phosphorus, niobium or tantalum · CPC title

• C03C2205/06

  for dental use · CPC title

• C03C4/0021

  for dental use · CPC title