Porcelain coating compositions for low expansion porcelain cores and the resulting all-ceramic dental restorations

摘要

An all-ceramic dental restoration comprising a ceramic core over and at least one coating thereon of a porcelain composition having a maturing temperature of from about 850 to about 1050 C. and a coefficient of thermal expansion of from about 4.0 to about 13 (room temperature to 500 C.) parts per million per C. comprising: PP______________________________________ PP Component Amount (Wt. %) PP ______________________________________ PPSiO.sub.2 69-75 PPAl.sub.2 O.sub.3 PP 4.0-9.5 P PNa.sub.2 O 5-10 PPK.sub.2 O 0-4 P PCaO 0-1.5 PPMgO 0-6 PPB.sub.2 O.sub. 3 PP 6-15 PPF 0-3 PP ______________________________________ PP