Abstract

Three commercial palladium alloys (PdCuGa, PdCoGa, and PdAgSn) were melted and cast in graphite and ceramic crucibles in order to introduce small, but different levels of carbon impurities in the alloys. The solubility of carbon is known to become smaller with decreasing temperature, and in the present alloys small amounts of carbon were found to cause a substantial reduction in ductility as measured by the elongation in a tensile test.

The shape of the clasps on removable partial dentures often has to be adjusted by bending. Occasionally they fracture during the small plastic deformation that takes place during the adjustment. The tendency to brittle failure of three Co-Cr-Mo alloys for prosthetic use with different carbon and chromium contents was investigated by tensile testing

A silver-palladium type of dental alloy for fixed restorations has been investigated with regard to the ability of the material to be plastically deformed in uniaxial tensile testing after two different age-hardening treatments. A certain degree of ductility is required for the burnishing of the margins.