Patent ID: 6761760
Filing Date: 2004-07-13
Classification: A61K,C03C

Abstract:
A porcelain composition for use as an opaque on dental alloys in the manufacture of a dental restoration comprising by weight percent:about 48 to about 65% SiO2; about 10 to about 15% Al2O3; about 0.5 to about 2% CaO; about 1.5 to about 3% Li2O; about 15 to about 17% K2O; about 4 to about 6% Na2O; and about 0.4 to about 1 F; wherein the porcelain possesses a coefficient of thermal expansion of about 16.9 to about 18.5 in the temperature range of 25Â° C. to 600Â° C.