Ceramic dental restoration

Details Ceramic dental restoration Ceramic dental restoration

A - Human Necessities

61

K

A61K 6/02 (2006.01) A61K 6/06 (2006.01)

Patent

CA 2289820

The invention relates to a ceramic dental restoration based on a leucitic glass-ceramic, which is characterised in that the glass-ceramic contains by way of components 40 - 95 ~wt.-% ~~SiO2 - 25 ~~wt.-% ~~Al2O3 5 - 25 ~~wt.-% ~~K2O 0 - 25 ~~wt.-% ~~Na2O 0 - 20 ~~wt.-% ~~CaO 0 - 8 ~~wt.-% ~~B2O3 0 - 0.5 ~~wt.-% ~~P2O5 0 - 3 ~~wt.-% ~~F, in that it contains, as sole crystalline phase, leucite in a total proportion from 20 to 45 wt.-%, at least 80 % of the theoretically producible quantity of leucite being present, and in that it exhibits a linear coefficient of thermal expansion .alpha.(20-500°C) from 12.5 .cndot. 10-6 to 15.5 .cndot. 10-6 K-1. This glass-ceramic is particularly suitable for processing as pressed ceramic and can be advantageously faced with dental ceramic that exhibits a linear coefficient of thermal expansion .alpha.(20-500°C) from 13.5 .cndot. 10-6 to 17.0 .cndot. 10-6 K-1.

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