抄録
The standard dental gold alloy is a 20-carat alloy, but lower carat alloys are also used. In Japan, 14-carat gold alloy3 are still used often in actual practice but from the point of not only resistance to tarnish and corrosion but also from the point of the mechanical properties these have been recognized generally not being sufficient as a dental alloy. Consequently, the question naturally arises as to whether there is a good dental alloy which has a gold content intermediate of the two alloys mentioned above. However, contrary to our expectation there are few studies on this problem. Therefore studies were made on the composition and the significant properties of the Au-Ag-Cu-Zn system 16-carat dental gold alloys and on the practical use of these alloys. In addition, studies were made on the effect of heat treatment. As a result, it was found that the composition of the 16-carat alloys is 66.7% of Au, 18-10% of Ag, 5-2 % of Zn and Cu composing the rest, having on the average a fairly good property.
