Abstract:

Objective To investigate the cyclic fatigue of casting clasps in cobalt chromium alloy, titanium alloy and high cobalt chromium molybdenum alloy. Methods The cyclic fatigue of three kinds of casting clasps in alloy materials of cobalt chromium alloy, titanium alloy and high cobalt chromium molybdenum alloy on the butments with two pour concave depth (0.25 mm and 0.50 mm) for simulation of clinical use for five years was examined, and the enclasp force before and after cyclic fatigue was tested. Results The statistical analysis of enclasp force test before and after cyclic fatigue of three kinds of casting clasps revealed that with the same pour concave depth, the enclasp force of casting clasps in titanium alloy was the lowest, that in high cobalt chromium molybdenum alloy was the highest, and there were significant differences among three kinds of casting clasps (P<0.05). With the same alloy materials, the enclasp force of pour concave depth of 0.50 mm was significantly higher than that of pour concave depth of 0.25 mm (P<0.05). Conclusion The fatigue restraint ability of high cobalt chromium molybdenum alloy is superior to titanium alloy and cobalt chromium alloy, and the fatigue restraint ability of titanium alloy is the lowest.

Key words: cobalt chromium alloy, titanium alloy, high cobalt chromium molybdenum alloy, enclasp force, cyclic fatigue