Lithium Silicate-Low Quartz Glass Ceramic

Patent metadata

Field	Value
Publication number	US-2022227663-A1
Application number	US-202217714385-A
Country	US
Kind code	A1
Filing date	Apr 6, 2022
Priority date	Aug 25, 2015
Publication date	Jul 21, 2022
Grant date	—

Abstract

Lithium silicate-low quartz glass ceramics are described which are characterized by a combination of very good mechanical and optical properties and can therefore be used in particular as restoration material in dentistry.

First claim

1 . Lithium silicate-low quartz glass ceramic, which comprises lithium silicate as main crystal phase and low quartz as further crystal phase.

2 . Glass ceramic according to claim 1 , which comprises 59.0 to 79.0 wt.-% SiO 2 .

3 . Glass ceramic according to claim 1 , which comprises 8.0 to 15.0 wt.-% Li 2 O.

4 . Glass ceramic according to claim 1 , which comprises 0 to 9.0 wt.-% P 2 O 5 .

5 . Glass ceramic according to claim 1 , which comprises 1.0 to 8.0 wt.-% oxide of monovalent elements Me I 2 O selected from the group of K 2 O, Na 2 O, Rb 2 O, Cs 2 O and mixtures thereof.

6 . Glass ceramic according to claim 1 , which comprises 1.0 to 9.0 wt.-% oxide of divalent elements Me II O selected from the group of CaO, MgO, SrO, ZnO and mixtures thereof.

7 . Glass ceramic according to claim 1 , which comprises 1.0 to 6.0 wt.-% MgO.

8 . Glass ceramic according to claim 1 , which comprises 0 to 8.0 wt.-% oxide of trivalent elements Me III 2 O 3 selected from the group of Al 2 O 3 , B 2 O 3 , Y 2 O 3 , La 2 O 3 , Ga 2 O 3 , In 2 O 3 and mixtures thereof.

9 . Glass ceramic according to claim 1 , which comprises 1.0 to 6.0 wt.-% Al 2 O 3 .

10 . Glass ceramic according to claim 1 , which comprises at least one of the following components in the amounts specified:

Component
wt.-%

SiO 2
59.0 to 79.0

Li 2 O
8.0 to 15.0

P 2 O 5
0 to 9.0

MeI 2 O
1.0 to 8.0

MeIIO
1.0 to 9.0

MeIII 2 O 3
0 to 8.0

MeIVO 2
0 to 10.0

MeV 2 O 5
0 to 8.0

MeVIO 3
0 to 5.0

fluorine
0 to 1.0,

wherein
Me I 2 O is selected from the group of K 2 O, Na 2 O, Rb 2 O, Cs 2 O and mixtures thereof,
Me II O is selected from the group of CaO, MgO, SrO, ZnO and mixtures thereof,
Me III 2 O 3 is selected from the group of Al 2 O 3 , B 2 O 3 , Y 2 O 3 , La 2 O 3 , Ga 2 O 3 , In 2 O 3 and mixtures thereof,
Me IV O 2 is selected from the group of ZrO 2 , TiO 2 , SnO 2 , CeO 2 , GeO 2 and mixtures thereof,
Me V 2 O 5 is selected from the group of V 2 O 5 , Ta 2 O 5 , Nb 2 O 5 and mixtures thereof, and
Me VI O 3 is selected from the group of WO 3 , MoO 3 and mixtures thereof.

11 . Glass ceramic according to claim 1 , which comprises at least one of the following components in the amounts specified:

Component
wt.-%

SiO 2
59.0 to 79.0

Li 2 O
8.0 to 15.0

P 2 O 5
0 to 9.0

K 2 O
0 to 5.0

Na 2 O
0 to 2.0

Rb 2 O
0 to 8.0

Cs 2 O
0 to 7.0

CaO
0 to 3.0

MgO
0 to 6.0

SrO
0 to 4.0

ZnO
0 to 9.0

Al 2 O 3
1.0 to 6.0

B 2 O 3
0 to 4.0

Y 2 O 3
0 to 5.0

La 2 O 3
0 to 5.0

Ga 2 O 3
0 to 3.0

In 2 O 3
0 to 5.0

ZrO 2
0 to 3.0

TiO 2
0 to 4.0

SnO 2
0 to 3.0

GeO 2
0 to 9.0

CeO 2
0 to 4.0

V 2 O 5
0 to 2.0

Ta 2 O 5
0 to 5.0

Nb 2 O 5
0 to 5.0

WO 3
0 to 3.0

MoO 3
0 to 3.0

fluorine
0 to 1.0.

12 . Glass ceramic according to claim 1 , which comprises SiO 2 and Li 2 O in a molar ratio in the range of from 2.2 to 4.1.

13 . Glass ceramic according to claim 1 , which co

Assignees

• Ivoclar Vivadent Ag

Inventors

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

Classifications

• C03C10/0045

  containing SiO2, Al2O3 and MgO as main constituents · CPC title

• C03B19/066

  for the production of quartz or fused silica articles (other processes specially adapted for the production of quartz or fused silica articles C03B20/00) · CPC title

• A61C13/0006

  Production methods · CPC title

• A61C13/0004

  Computer-assisted sizing or machining of dental prostheses · CPC title

• C03C10/0027 Primary

  containing SiO2, Al2O3, Li2O as main constituents · CPC title