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US 6,606,884 B2Granted
Sinterable lithium disilicate glass ceramic
AssigneeIvoclar AG
InventorsMarcel Schweiger, Martin Frank, Volker Rheinberger, Wolfram Hoeland
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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.
Claims29
A process for making a lithium disilicate glass ceramic comprising the following components:
- Component Wt. % SiO2 57.0 to 80.0 Al2O3 0 to 5.0 La2O3 0.1 to 6.0 MgO 0 to 5.0 ZnO 0 to 8.0 K2O 0 to 13.5 Li2O 11.0 to 19.0 P2O5 0 to 11.0 Color components 0 to 8.0 Additional components 0 to 6.0
- wherein
- Al2O3+La2O3 equals 0.1 to 7.0 wt. % and
- MgO+ZnO equals 0.1 to 9.0 wt. % comprising:
- fusing starting glass components to form a glass melt;
- forming glass granules from the glass melt;
- comminuting the glass granules to form a powder;
- compacting the powder to form a glass blank;
- and
- subjecting the glass blank to a first heat treatment step to produce a glass ceramic blank.
7 more elements
Dependencies are inferred from the claim text.