Glass Ceramic Having A Quartz Solid Solution Phase

Patent metadata

Field	Value
Publication number	US-2019365515-A1
Application number	US-201916524297-A
Country	US
Kind code	A1
Filing date	Jul 29, 2019
Priority date	Apr 7, 2014
Publication date	Dec 5, 2019
Grant date	—

Abstract

Quartz solid solution glass ceramics and precursors thereof are described, which are characterized by very good mechanical and optical properties and in particular can be used as restoration material in dentistry.

First claim

1 . Process for preparing a dental restoration comprising forming a glass ceramic, which comprises a quartz solid solution phase and comprises the following components

Component
wt.-%

SiO 2
37.0 to 50.0

Al 2 O 3
25.0 to 39.0

MgO
5.0 to 15.0

ZrO 2
13.5 to 19.0,

into a dental restoration.

2 . Process according to claim 1 , wherein the glass ceramic comprises 38.0 to 49.0 wt.-% SiO 2 .

3 . Process according to claim 1 , wherein the glass ceramic comprises 26.0 to 38.0 wt.-% Al 2 O 3 .

4 . Process according to claim 1 , wherein the glass ceramic comprises 6.0 to 14.0 wt.-% MgO.

5 . Process according to claim 1 , wherein the glass ceramic comprises 14.0 to 18.0 wt.-% ZrO 2 .

6 . Process according to claim 1 , wherein the glass ceramic comprises at least one of the additional following components:

Component
wt.-%

Li 2 O
0 to 1.0

Na 2 O
0 to 1.0

K 2 O
0 to 1.0

CaO
0 to 2.5

SrO
0 to 4.0

ZnO
0 to 15.0

B 2 O 3
0 to 1.0.

7 . Process according to claim 1 , wherein the glass ceramic comprises the quartz solid solution phase as main crystal phase.

8 . Process according to claim 1 , wherein the glass ceramic comprises a high-quartz solid solution phase, a low-quartz solid solution phase or a mixture thereof.

9 . Process according to claim 8 , wherein the glass ceramic comprises the high-quartz solid solution phase in a higher amount than the low-quartz solid solution phase.

10 . Process according to claim 8 , wherein the glass ceramic comprises the high-quartz solid solution phase as main crystal phase.

11 . Process according to claim 8 , wherein the glass ceramic comprises the low-quartz solid solution phase in a higher amount than the high-quartz solid solution phase.

12 . Process according to claim 8 , wherein the glass ceramic comprises the low-quartz solid solution phase as main crystal phase.

13 . Process according to claim 1 , which comprises zirconium oxide as a crystal phase.

14 . Process according to claim 1 , wherein the glass ceramic is present in the form of a powder or a blank.

15 . Process according to claim 1 , wherein the glass ceramic is given, by machining, the shape of the desired dental restoration.

16 . Process according to claim 1 , wherein the dental restoration is a bridge, inlay, onlay, veneer, abutment, partial crown, crown or facet.

16 . Process according to claim 9 , wherein the glass ceramic with a higher amount of high-quartz solid solution phase is given the shape of the desired dental restoration by machining.

17 . Process for preparing a dental restoration comprising forming a starting glass, which comprises the following components

Component
wt.-%

SiO 2
37.0 to 50.0

Al 2 O 3
25.0 to 39.0

MgO
5.0 to 15.0

ZrO 2
13.5 to 19.0,

into a dental restoration.

18 . Process according to claim 17 , wherein the starting glass comprises nuclei for the crystallization of a quartz solid solution phase.

19 . Process according to claim 17 , wherein the starting glass is given, by machining, the shape of the desired dental restoration.

20 . Process according to claim 17 , wherein the dental restoration is a bridge, inlay, onlay, veneer, abutment, partial crown, crown or facet.

Assignees

• Ivoclar Vivadent Ag

Inventors

• Dittmer Marc
• Höland Wolfram
• Schweiger Marcel
• Rüssel Christian
• Seidel Sabrina

Classifications

• C03C10/0009 Primary

  containing silica as main constituent · CPC title

• C03B32/02 Primary

  Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles {(C03B27/012 takes precedence)} · CPC title

• C03C3/068

  containing rare earths · CPC title

• C03C3/064

  containing boron · CPC title

• C03C3/085

  containing an oxide of a divalent metal · CPC title