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US 6,121,175 AGranted
Alkali silicate glass
AssigneeIvoclar AG
InventorsHelga Drescher, Frank Martin, Volker Rheinberger, Wolfram Holand
Life of this patent
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Abstract
Alkali silicate glasses are described which, in view of their good chemical stability and their optical properties and processing properties, are particularly suitable as a coating or veneering material for ceramic dental frameworks and hence for the production of all-ceramic dental restorations such as crowns or bridges.
Claims7
A dental material comprising an apatite glass ceramic and an alkali silicate glass, the alkali silicate glass comprising:
- ______________________________________ Component Wt. % ______________________________________ SiO.sub.2 55.0 to 71.0 Al.sub.2 O.sub.3 5.0 to 16.0 B.sub.2 O.sub.3 0.2 to 10.0 K.sub.2 O 4.5 to 10.0 Na.sub.2 O 3.0 to 14.0. ______________________________________
A method of coating a substrate comprising:
- providing a substrate comprising a lithium disilicate glass ceramic and
- coating the substrate with a dental material comprising an alkali silicate glass which comprises the following components:
- ______________________________________ Component Wt. % ______________________________________ SiO.sub.2 55.0 to 71.0 Al.sub.2 O.sub.3 5.0 to 16.0 B.sub.2 O.sub.3 0.2 to 10.0 K.sub.2 O 4.5 to 10.0 Na.sub.2 O 3.0 to 14.0. ______________________________________
Dependencies are inferred from the claim text.