Patent ID: 6740267
Filing Date: 2004-05-25
Classification: A61C,A61K,C03C

Abstract:
A method of preparing a ceramic artificial crown comprising steps of:molding a ceramic material heated and softened to a ceramic core by putting the ceramiic material into a mold with the application of a pressure; applying at least one kind of dental porcelain selected from a the group consisting of a body porcelain, an incisal porcelain and a translucent porcelain onto the surface of the ceramic core; and firing the dental porcelain; and wherein, said mold for moldg the ceramic material is formed by burning a wax pattern after having removed a crucible former from an assembly which comprises: said crucible former having a pole member formed on the central portion of a cylinder with bottom, said pole member having a recessed fitting portion at a central portion in the upper surface thereof; said wax pattern secured to said recessed fitting portion and applied with a solid lubricant on the surface thereof; a ring with a backing layer that engages with said cylinder with bottom; and an investment material filled and cured between said ring and, a tooth-shaped model; and wherein the ceramic core is molded by filing the ceramic material to a portion, which corresponds to the pole member, in the mold and then pushing the ceramic material by a plunger.