PROCESS FOR THE PREPARATION OF SHAPED TRANSLUCENT LITHIUM DISILICATE GLASS CERAMIC PRODUCTS
First Claim
1. 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
ComponentWt. %
SiO257.0 to 80.0Al2O3
(b) shaping the melt of the starting glass in the desired manner and cooling it, and (c) subjecting the shaped glass product to at least one heat treatment in the temperature range from 400 to 1100°
La2O30.1 to 6.0MgO
0 to 5.0
0 to 5.0ZnO
0 to 8.0Li2O11.0 to 19.0where
(i) Al2O3 + La2O3 accounts for 0.1 to 7.0 wt. % and(ii) MgO + ZnO accounts for 0.1 to 9.0 wt. %,
C. in order to obtain a shaped glass ceramic product in the form of a blank.
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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.
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Citations
19 Claims
- 1. 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 5.0ZnO
0 to 8.0Li2O 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 in the desired manner 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.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification