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KMID : 0354619960080010103
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Journal Dankook Dental Research Institute
1996 Volume.8 No. 1 p.103 ~ p.120
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A Study on the Tensile Bond Strength between Impression Material and Individual Tray according to Various Impression Materials and drying time of Adhesives
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Abstract
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A fundamental princlple 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 forces.
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).
@EN The results were as follows .
@EN 1. The amount of tensile load of the wrought wire clasp was significantly different from the cast round or half round clasp(p<0.05).
2. The more amount of the undercut, the more tensile load was needed to dislodge the clasps. There wer significant differences 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 significant differences at the molar between wrought wire clasp and cast clasp(p<0.05), but did not at the premolar.
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KEYWORD
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