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US 6,420,288 B2Granted
Process for the preparation of shaped translucent lithium disilicate glass ceramic products
AssigneeIvoclar AG
InventorsMarcel Schweiger, Sascha Cramer von Clausbruch, Wolfram Höland, Volker Rheinberger
Life of this patent
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Abstract
A process is described for the preparation of shaped translucent lithium disilicate glass ceramic products which are characterized by high strength and good chemical stability and may be processed by pressing in the plastic state or milling to finished glass ceramic products which may be used in particular as dental restorations.
Claims20
A process for the preparation of shaped translucent lithium disilicate glass ceramic products, which comprises
- (a) producing a melt of a starting glass containing 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 Li2O 11.0 to 19.0 where (i) Al2O3 + La2O3 accounts for 0.1 to 7.0 wt. % and (ii) MgO + ZnO accounts for 0.1 o 9.0 wt. %,
- (b) shaping the melt of the starting glass and cooling it, and
- (c) subjecting the shaped glass product to at least one heat treatment in the temperature range from 400 to 1100° C. in order to obtain a shaped glass ceramic product in the form of a blank.
1 more element
A process for the preparation of shaped translucent lithium disilicate glass ceramic products, which comprises
- (a) producing a melt of a starting glass containing the following components
- Component Wt. % SiO2 57.0 to 80.0 Al2O3 0 to 5.0 La2O3 0.1 to 6.0 ZnO 0 to 8.0 Li2O 11.0 to 19.0 where (i) Al2O3 + La2O3 accounts for 0.1 to 7.0 wt. % and (ii) MgO + ZnO accounts for 0.1 to 9.0 wt. %,
- (b) shaping the melt of the starting glass and cooling it,
- (c) subjecting the shaped glass product to at least one heat treatment in the temperature range from 400 to 1100° C. in order to obtain a shaped glass ceramic product in the form of a blank, and
- (d2) processing the glass ceramic product in the form of a blank by machining to a glass ceramic product of the desired geometry.
2 more elements
Dependencies are inferred from the claim text.