![]() ![]() The fusion temperature of the ceramic (usually lower than 100° C) 1 is lower than the metal casting temperature, which prevents the cast metal substructure from melting during porcelain application. 1, 4, 5 Ceramic and metal alloys must have properties that allow for both physical and chemical compatibility. If this is not the case, an error in fabrication technique usually is to blame. Fracture usually occurs within the body of the porcelain. The strength of the porcelain-to-metal bond is close to the tensile strength of the opaquing porcelain. Ceramometal dental restorations, however, offer both strength and acceptable appearance. 2 Full cast restorations offer sufficient strength but lack the esthetic appearance required in today’s society. 1 Newer porcelain materials are stronger but still cannot be used to create multiple-unit fixed prostheses. ![]() The conventional all-ceramic and acrylic resin full and partial coverage restorations, although esthetically pleasing, may fail under heavy occlusal stress because of low tensile and shear strengths.
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