[Heat treatment of gold alloy to get adhesion with resin (author's transl)].

Combination of gold alloy and resin is common to prepare prostheses and restorations in dentistry. However, durable adhesion between gold alloy and resin has not been achieved, and mechanical retention which possesses many disadvantages is indispensable to fix them with each other. In our previous report, we had prepared a 4-META adhesive opaque resin and made sure of its excellent adhesiveness to dental non-precious alloy. Here, we developed a new method to change gold alloy surface adhesive and studied the adhesion between 4-META opaque resin and the modified alloy surface. The treatment is consisted of heat treatment and acid pickling. 4-META opaque resin could adhere strongly to treated gold alloys and the adhesive bond strength was 250 Kg/cm2. Moreover, durability of the adhesion is excellent and the value did not decreased even after subjected to 2000 cycle of thermal cycling (4 degrees C and 60 degrees C) or long immersion in water at 37 degrees C.