Patent ID: 7494339

Claim:
A method of forming a permanent dental crown, comprising in sequence the steps of: providing a polymerizable flexible cement composition comprising a blend of urethane dimethacrylate and polyether diurethane methacrylate; applying the cement composition to a prepared tooth surface and polymerizing the composition so that it substantially hardens and forms a flexible spacer material; dispensing a composite crown-forming material into a substantially transparent plastic matrix, the composite material having a polymerization system capable of being activated by light; placing the plastic matrix in a mouth of a patient so that the composite material is molded over the tooth surface; irradiating the composite material in the plastic matrix with light so that the material polymerizes and hardens to form a crown; removing the hardened crown from the surface of the tooth; and permanently affixing the crown to the tooth using permanent dental cement.