Color analysis of oxidized Pd-free Au-Pt-based high noble dental alloys for porcelain veneering

Abstract

The effects of oxide-forming elements, In, Fe, Sn, Zn, on color variations of the oxidized Pd-free Au-Pt-based high noble dental alloys for porcelain veneering were investigated by means of spectrophotometric colorimetry and thin-film X-ray diffraction technique. Activity of high temperature oxidation was strongly dependent on the base metal elements included. The most active oxide-forming element was Zn, followed by Sn, In, and Fe. From the viewpoint of color stability of the oxidized Au-Pt-based high noble dental alloys for porcelain veneering, the inclusion of a small amount of In was found to be advantageous.