Abstract:

Objective The purpose of this study was to introduce cryotreat technique into prosthetic dentistry by investigating the wear resistance changes of SDA-Ⅱ medium melting-point castable alloy before and after cryotreat.Methods 15 samples were divided into three groups, i.e. control group, cryotreat group, cryotreated plus post-cryogenic treat group. Weight loss measurement was used to examine the wear resistance.Results For SDA-Ⅱ medium melting-point castable alloy, cryotreat effectively improved its wearing resistance; so far as the wear resistance was concerned, the post-cryogenic treatment was unnecessary. Conclusion The results obtained above suggest that cryotreat was an effective method in enhancing the wear resistance of SDA-Ⅱ medium melting-point castable alloy.

Key words: cryotreat, SDA-Ⅱ medium melting-point castable alloy, wear resistance