With the surface section and deep part with the dentistry clasp and its production methodological null mass percentage which have quarter-phase structure where

摘要

PROBLEM TO BE SOLVED: To produce a gold-silver-palladium alloy which is hard to be broken, and also has maintenance force and high hardness so as to satisfy a wide demand required, e.g. in a clasp for dental treatment, and which has improved fatigue resistance and discoloration resistance in an operation process in a short time so as to be used for dental materials at the same time.;SOLUTION: The gold-silver-palladium alloy to be hardened by YAG(yttrium- aluminum-garnet) laser irradiation contains about 14 to 18% gold, about 18 to 22% palladium, 8 to 42% silver, about 18 to 22% copper and about 2 to 6% zinc. The alloy has two phase structure different in mechanical properties between the surface layer and the deep part, so that the gold-silver-palladium alloy which is hard to be broken, has maintenance force, and is particularly suitable for a clasp in dental use can be produced.;COPYRIGHT: (C)2002,JPO