Fatigue resistance and retentive force of cast clasps treated by shot peening.

Abstract

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.

• Authors: Ai Tokue, Tohru Hayakawa, Chikahiro Ohkubo
• Journal: Journal of prosthodontic research (J Prosthodont Res) Vol. 57 Issue 3 Pg. 186-94 (Jul 2013) ISSN: 2212-4632 [Electronic] Japan
• PMID: 23809297 (Publication Type: Journal Article)
• Copyright: Copyright © 2013 Japan Prosthodontic Society. Published by Elsevier Ltd. All rights reserved.

Chemical References

• Dental Alloys

Topics

• Dental Alloys
• Dental Casting Technique
• Dental Clasps
• Dental Polishing (methods)
• Dental Stress Analysis
• Denture Retention
• Denture, Partial, Removable
• Materials Testing
• Stress, Mechanical
• Surface Properties