[Chromatic studies of porcelain veneered crown. Application of ceramco opaque porcelain]

Chromatic characteristics were compared between the porcelain fused metal substructures using a gold alloy and a nickel-chromium alloy with or without superficially sprayed with gold alloy. From the stand point of the hiding efficiency for the metallic color of the substructure by opaque porcelain fusing, the gold alloy and the sprayed nickel-chromium alloy were superior to the nickel-chromium one as a metal for the porcelain-fused-to-metal crown. The likeness in color of the gold alloy and the sprayed one was also shown. As the conclusion, the application of wire explosion spraying technique which combines the advantages of the gold alloy and the nickel-chromium one appears to be quite useful for providing an excellent substructure for porcelain-fused crowns.