Patent ID: 6923420

Claim:
A kit used for the preparation of a, ceramic artificial crown, which comprises: a 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 with which a wax pattern is to be secured; a ring that engages with the cylinder with bottom of said crucible former; a backing member fitted to the inner surface of the ring; an investment material filled between the crucible former and the ring; a plunger for pushing a ceramic member filled in a portion corresponding to the pole member of the crucible former of a mold that is formed by curing the investment material, removing the crucible former and burning the wax pattern; and a container for suspension to apply a solid lubricant onto the wax pattern or onto a portion of the plunger that comes into contact with said ceramic member.