수종의 클래스프의 언더커트에 따른 인장력에 관한 연구
A STUDY OF THE TENSILE LOAD OF SEVERAL CALSPS ACCORDING TO VARIOUS UNDERCUT AREA
김봉환, 임주환, 조인호,
소속 상세정보
김봉환 ( Kim Boong-Hwan ) - 단국대학교 치과대학 치과보철학교실
임주환 ( Lim Ju-Hwan ) - 단국대학교 치과대학 치과보철학교실
조인호 ( Cho In-Ho ) - 단국대학교 치과대학 치과보철학교실
KMID : 0362419970350030470
Abstract
A fundamental principle in clasp selection for a specific abutment is the reduction of the transmission of excessive forces to the abutment tooth. Those forces include tilting, tipping, and stress on the abutment tooth. The flexibility of a clasp was believed to directly affect the reduction of such forces. Opinions have been expressed concerning the proper type of clasp to be used to prevent stress on periodontium. In order to evaluate and compare the various designs of a clasp system, it is necessary to measure these force. This study compared the average measurements of forces required to dislodge three kinds of circumferential clasps having different amount of undercuts : the first with a round retentive arm, the second with a half round retentive arm, the third with a wrought wire retentive arm under tensile load. Three commonly used undercuts( 0.01, 0.02, 0.03 inch) were created on nine cast crowns, premolars and molars. The test was run six times for a same clasp. The means of tensile load required to dislodge each of the different clasps were compared statistically using the ANOVA test and multiple range test (Duncan test) The results were as follows. 1. The amount of tensile load of the wrought wire clasp was significa-ntly different from the cast round or half round clasp(P<0.05) 2. The more amount of the undercut, the more tensile load was need-ed to dislodge the clasp. There were significant difference among them(P<0.05) 3. The molar showed higher tensile load than the premolar, and there was significant difference(P<0.05) 4. The means of tensile load according to clasp types showed signific-ant differences at the molar between wrought wire clasp and cast clasp (P<0.05), but did not at the premolar
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