Dental glass ceramics
AssigneeIvoclar Vivadent AG
InventorsWolfram Holand, Christian Ritzberger, Volker Rheinberger, Elke Apel
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Abstract
The invention relates to dental glass-ceramics and a process for producing them and their use, with these comprising at least one crystal phase containing xenotime or monazite or mixtures thereof.
Claims27
A dental glass-ceramic, wherein it comprises at least one crystal phase containing xenotime or monazite or mixtures thereof.
A process for producing a dental glass-ceramic comprising at least one crystal phase containing xenotime or monazite or mixtures thereof wherein
- (a) the components required for producing the glass-ceramic are mixed and melted to form a glass,
- (b) the glass melt from step (a) is converted by fritting into glass granules,
- (c) if appropriate, the glass granules are comminuted to give a powder having an average particle size of from 1 to 500 μm (based on the number of particles) and
- (d) the glass granules from step (b) or the glass powder from step (c) are/is subsequently subjected to a single-stage or multistage thermal treatment in the temperature range from 700° C. to 1200° C. for a period of from about 30 minutes to about 6 hours.
A use of dental glass-ceramics comprising at least one crystal phase containing xenotime or monazite or mixtures thereof, or a mixed glass-ceramic as opacifying component, dental material, for producing a dental material or a dental restoration.
Dependencies are inferred from the claim text.