Patent ID: 9206077
Filing Date: 2015-12-08
Classification: A61K,C03B,C03C

Abstract:
1. A method for producing a dental restoration comprising a lithium silicate glass ceramic, wherein a) an amorphous glass having the following composition: 55 to 70 wt-% SiO 15 to 22 wt-% Li 8 to 20 wt-% of a stabiliser selected from the group consisting of ZrO 0 to 10 wt-% Al 0 to 10 wt-% K 0 to 8 wt-% P 0 to 20 wt-% additives, is subjected to at least one heat treatment with temperatures from 450 to 1100° C. resulting in a translucent and tooth coloured and glass ceramic with a strength of at least 250 MPa (measured according to DIN ISO 6872) and with the colour of tooth, wherein during the at least one heat treatment at least a partial crystallisation occurs due to the increased temperatures, and b) the glass ceramic is formed into a dental restoration for immediate dental application and with a strength of at least 200 MPa (measured according to DIN ISO 6872) by a material removing process.