The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
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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

삽입철거 회수가 수종의 Cr-Co 합금 Clasp 유지력에 미치는 영향에 관한 실험적 연구

  • Bae Jung-Soo (Dept. of Prosthodontics, School of Dentistry, Yonsei University) ;
  • Lee Ho-Yong (Dept. of Prosthodontics, School of Dentistry, Yonsei University)
  • 배정수 (연세대학교 치과대학 보철학교실) ;
  • 이호용 (연세대학교 치과대학 보철학교실)
  • Published : 1992.12.01
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Abstract

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 Cr-Co 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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