Lithium disilicate glass-ceramic, method for production thereof and use thereof
AssigneesFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Vita Zahnfabrik H. Rauter GmbH & Co. KG, Degudent GmbH
InventorsBernhard DURSCHANG, Jörn PROBST, Norbert THIEL, Joachim BIBUS, Markus VOLLMANN, Udo SCHUSSER
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Abstract
The invention relates to glass-ceramics based on the lithium silicate system which can be mechanically machined easily in an intermediate step of crystallization and, after complete crystallisation, represent a very strong, highly-translucent and chemically-stable glass-ceramic Likewise, the invention relates to a method for the production of these glass-ceramics. The glass-ceramics according to the invention are used as dental material.
Claims2
(canceled)
A method of producing a shaped lithium disilicate dental product, comprising:
- a) producing an initial glass, wherein the amount of SiO2 is 55 to 70 weight percent, the amount of Li2O is 10 to 15 weight percent, the amount of K2O is 0.1 to 5 weight percent, the amount of A1203 is 0.1 to 5 weight percent, the amount of P2O5 is 2 to 5 weight percent, and the amount of ZrO2 is at least 10.0 weight percent, wherein the total weight percent is 100 weight percent;
- b) subjecting the initial glass to a first heat treatment in order to produce a glass-ceramic which has lithium metasilicate as the main crystal phase;
- c) forming a shaped dental product out of the glass-ceramic;
- and
- d) forming a shaped lithium disilicate dental product by subjecting the shaped dental product to a second heat treatment in which the lithium metasilicate is converted with SiO2 from the glass phase into lithium disilicate and subsequently lithium disilicate is present as the main crystal phase.
Dependencies are inferred from the claim text.