Abstract
R e s t o r a t i v e materials for fixed prosthodontics must be capable of withstanding masticatory forces. The mechanical properties of the high-fusing gold alloys differ from those of type III and type IV dental casting alloys. '-'~ The microstructure and mechanical properties of the noble dental alloys are dependent on the composition of the alloy.' There is a systematic relationship between the proportional limit, tensile strength, and hardness of noble alloys for porcelain veneering. :~-~ Chemical composition and microstructure of a high-fusing gold alloy varies depending on the location within the metal, s 'n The purpose of this study was to determine the microhardness of three high-fusing alloys at the metal/porcelain interface and centrally in the fused specimen during different stages of alloy preparations.
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