Application of New Adhesive Precious Metal Alloys to Prosthodontic and Restorative Dentistry, and Study on Adhesion Mechanism

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The purpose in the present project is to develop a new precious metal alloy for dental adhesive resin bonding. Three base metals, Sn, In, and Zn, were separately added to four metals, Au, Pd, Ag, and Cu, in order to obtain the binary alloys having superior durability for water at the adhesion interface.Indium addition of 15 wt% in the gold was effective to improve adhesion with 4-META resin. The alloy surface was analyzed to clarify the reasons by ESCA in the present study.Indium contents at the surface were higher than the bulk concentration of indium with increasing of indium addition. According to analysis of O ls spectrum, m both amounts of oxygen formed oxide and oxygen due to physisorbed water on the oxide were increased with increasing of indium addition. It is considered as the reason why indium addition leads to excellent adhesive ability.