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Volume 19 , Issue 4
July/August 2006

Pages 371372

Comparison of the Retentive Characteristics of Cobalt-Chromium and Commercially Pure Titanium Clasps Using a Novel Method

Edward T. P. Tse, BDS, MDS / Leo Y. Y. Cheng, MPhil / Henry W. K. Luk, PhD / Frederick C. S. Chu, BDS, MSc, PhD / John Chai, BDS, MS, MJ, DLaw / Tak W. Chow, BDS, MSc, PhD

PMID: 16900820

This study aimed to compare the retentive forces of cast cobalt-chromium (Co-Cr) and commercially pure titanium (cpTi) clasps. A clasp assembly comprising a pair of symmetrical clasps was made to fit the opposite halves of a hardened stainless-steel sphere. This twin clasp was designed to counterbalance the tipping forces when the clasp assembly was drawn from the sphere. A total of 120 clasp assemblies were fabricated in cast Co-Cr and cpTi and placed at undercut depths of 0.25 mm, 0.50 mm, and 0.75 mm (n = 20 for each). For Co-Cr clasps, the retentive forces at these undercuts depths were 2.34 0.23 N, 4.65 0.35 N, and 7.56 0.50 N, respectively. The corresponding retentive forces for cpTi clasps were 1.24 0.13 N, 2.34 0.23 N, and 3.70 0.27 N. The retentive force of cpTi clasps was approximately half that of Co-Cr clasps for the same undercut depth. Int J Prosthodont 2006;19:371372.

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