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J Prosthodont Res. 2013 Jul;57(3):186-94. doi: 10.1016/j.jpor.2013.01.006. Epub 2013 Jun 25.

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

Author information

1
Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine, Japan. tokue-ai@tsurumi-u.ac.jp

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.

KEYWORDS:

Clasp; Fatigue strength; Shot peening; Surface modification; Titanium

PMID:
23809297
DOI:
10.1016/j.jpor.2013.01.006
[Indexed for MEDLINE]
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