Patent ID: 7279238
Filing Date: 2007-10-09
Classification: A61K,C03C

Abstract:
1. A dental ceramic comprising: a glass frit; a glass-ceramic frit comprising leucite; and a refractory filler having a thermal expansion lower than the thermal expansion of the frits and a refractive index within ±0.2 of the refractive index of the frits; wherein leucite is present in the dental ceramic in an amount less than about 35% by weight; wherein the thermal expansion of the dental ceramic is in the range of about 12.5×10 −6 /° C. to about 14.5×10 −6 /° C. measured from room temperature to 500° C.; wherein the dental ceramic is pressable from about 980 to about 1030° C.; and wherein the dental ceramic can withstand firing of a porcelain onto the dental ceramic without distortion of the dental ceramic at a range from about 830° C. to about 900° C.