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KMID : 0362419920300040498
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Journal of Korean Academy of Prosthodontics
1992 Volume.30 No. 4 p.498 ~ p.507
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THE EXPERIMENTAL STUDY ON THE EFFECT OF THE INSERTION-WITHDRAWAL COUNT TO THE RETENTIVE CAPACITIES OF SEVERAL Cr-Co ALLOY CLASPS
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Bae Jung-Soo
Lee Ho-Yong
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Abstract
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This study was to investigate the retentive force changes according to repeated insertion and withdrawal of Cr-Co alloy clasps, commonly used in this country, and the differences in retentive capacities between Aker’s clasp and I-bar clasp. The author selected 4 kinds of Cr0Co alloys and Type Ⅳ gold alloy, and measured the retentive force changes of each clasp type in undercut depth of 0.25mm and analyzed statistically. The following results were obtained. 1. In both Aker’s and I-bar clasps, there were no statistically significant differencies in retentive forces among 4 Cr-Co alloys. 2. Cr-Co alloys exerted greater retentive forces than those of gold alloy, 2 times greater in Aker’s clasps and 2.5 times in I-bar clasps. 3. In all test specimens, I-bar clasps exerted greater retentive forces than Aker’s clasps. 4. In all test specimens, there were trends of second order relationships in retentive force changes.
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KEYWORD
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