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.degree. to about 1050.degree.C. and a coefficient of thermal expansion of from about 4.0 to about 13 (room temperature to 500.degree. C.) parts per million per .degree. C. comprising: Component Amount (Wt. %) SiO2 69 - 75 Al2O3 4.0 - 9.5 Na2O 5 - 10 K2O 0 - 4 CaO 0 - 1.5 MgO 0 - 6 B2O3 6 - 15 F 0-3