The purpose of this experimental study is to investigate the relationship between the retentive capacity of clasp and the different undercuts. The author measured the retentive power of Aker's clasp and I-bar clasp of chromium cobalt alloy and gold alloy, varying the undercut depth of 0.125mm, 0.25mm and 0.5mm, and then analyzed statistically. The results were followings. 1. The retentive capacity of chromium cobalt alloy clasps were almost twice as much of gold alloy in each undercut. 2. The retention power of I-bar clasp were higher than Aker's clasp in each undercuts. 3. Increasing the depth of undercut in 0.125mm, 0.25mm and 0.5mm, the clasps did not always exert the multiple amount of the retentive power.
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