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Published on: September 23, 2018
Fatigue resistance and retentive force of cast clasps treated by shot peening
Ai Tokue1, Tohru Hayakawa, Chikahiro Ohkubo
1Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine, Japan. tokue-ai@tsurumi-u.ac.jp
Purpose:
The fatigue failure of denture clasps has often been observed in removable partial denture rehabilitation. To increase their fatigue strength, shot peening was evaluated as a surface treatment. In this study, we evaluated the fatigue resistance and retention of cast clasps by using a shot peening treatment.
Methods:
A cobalt-chromium (Co-Cr) alloy, commercial pure titanium (CP Ti), silver-palladium-gold (Ag-Pd-Au), and a gold-platinum (Au-Pt) alloy were cast and then treated with shot peening. The retentive forces of the clasps were measured up to a repetition of 10,000insertion/removal cycles in distilled water at 37°C. A fatigue test was also performed using a 15-mm cantilever. Specimens were loaded with a constant deflection of 2.0mm with 20Hz. A shot peening treatment indicated a better stability of retentive forces than that without shot peening. The retentive force of Co-Cr clasps without shot peening was remarkably decreased at 500 cycles of insertion/removal repetition.
Results:
The clasps with a shot peening treatment provided approximately 1.4-3.6 times higher fatigue strengths than those without a shot peening treatment.
Conclusion:
To prevent the fatigue failure of the denture clasps and use the dentures for long term, a shot peening treatment would be recommended.
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