Sinterable lithium disilicate glass ceramic

• US 5,968,856 A
• Filed: 09/05/1997
• Issued: 10/19/1999
• Est. Priority Date: 09/05/1996
• Status: Expired due to Term

• Current Assignee: Ivoclar AG
• Original Assignee: Ivoclar AG
• Inventors: Rheinberger, Volker, Schweiger, Marcel, Frank, Martin, Hoeland, Wolfram
• Primary Examiner(s): Silverman, Stanley S.
• Assistant Examiner(s): Ruller, Jacqueline A.
• Application Number:
  US08/924,232
• Time in Patent Office: 774 Days
• Field of Search: 264/16, 106/35, 501/1, 501/7, 501/64, 501/152, 65/33.1, 65/33.8
• US Class Current: 501/7
• CPC Class Codes: A61K 6/17 Particle size
• CPC Class Codes: A61K 6/78 Pigments
• CPC Class Codes: A61K 6/807 comprising magnesium oxide
• CPC Class Codes: A61K 6/818 comprising zirconium oxide
• CPC Class Codes: A61K 6/824 comprising transition metal oxides
• CPC Class Codes: A61K 6/833 Glass-ceramic composites
• CPC Class Codes: C03C 10/0009 containing silica as main constituent
• CPC Class Codes: C03C 10/0027 containing SiO2, Al2O3, Li2O as main constituents

Abstract

High-strength sinterable lithium disilicate glass ceramics are described which can be further processed in particular by pressing in the viscous state to shaped dental products.

Claims

1. A lithium disilicate glass ceramic, which comprises the following components:

space="preserve" listing-type="tabular">______________________________________ Component Wt. % ______________________________________ SiO.sub.2 57.0 to 80.0 Al.sub.2 O.sub.3 0 to 5.0 La.sub.2 O.sub.3 0.1 to 6.0 MgO 0 to 5.0 ZnO 0 to 8.0 K.sub.2 O 0 to 13.5 Li.sub.2 O 11.0 to 19.0 P.sub.2 O.sub.5 0 to 11.0 Color components 0 to 8.0 Additional components 0 to 6.0 ______________________________________

wherein

Al₂ O₃ +La₂ O₃ equals 0.1 to 7.0 wt. % and

MgO+ZnO equals 0.1 to 9.0 wt. %.

2. The lithium disilicate glass ceramic according to claim 1, wherein the color components are formed from glass-colored oxides, coloring bodies, or mixtures thereof in the following quantities:

glass-coloring oxides 0 to 5.0 wt. % and

coloring bodies 0 to 5.0 wt. %.

3. The lithium disilicate glass ceramic according to claim 1, which essentially consists of the components specified.

4. The lithium disilicate glass ceramic according to claim 1, wherein TiO₂, CeO₂, Fe₂ O₃, or mixtures thereof are present as glass-coloring oxides.

5. The lithium disilicate glass ceramic according to claim 1, which contains doped spinels, doped ZrO₂, or mixtures thereof as coloring bodies.

6. The lithium disilicate glass ceramic according to claim 1, wherein the additional components are B₂ O₃, F, Na₂ O, ZrO₂, BaO, SrO, or mixtures thereof.

7. The lithium disilicate glass ceramic according to claim 1, wherein the quantities of the components, independently of one another, are as follows:

space="preserve" listing-type="tabular">______________________________________ Component Wt. % ______________________________________ SiO.sub.2 57.0 to 75.0 Al.sub.2 O.sub.3 0 to 2.5 La.sub.2 O.sub.3 0.1 to 4.0 MgO 0.1 to 4.0 ZnO 0 to 6.0 K.sub.2 O 0 to 9.0 Li.sub.2 O 13.0 to 19.0 P.sub.2 O.sub.5 0 to 8.0 Color components 0.05 to 6.0 Additional components 0 to 3.0. ______________________________________

8. The lithium disilicate glass ceramic according to claim 7, wherein the composition includes:

space="preserve" listing-type="tabular">______________________________________ Component Wt. % ______________________________________ ZnO .1 to 5.0 K.sub.2 O .5 to 7.0 P.sub.2 O.sub.5 .5 to 8.0 ______________________________________