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KMID : 0362419920300010065
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Journal of Korean Academy of Prosthodontics
1992 Volume.30 No. 1 p.65 ~ p.72
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FLEXURE STRENGTH OF ACRYLIC RESIN TEMPORARY BRIDGE BY PONTIC DESIGN
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Oh Sang-Chun
Jin Tai-Ho
Dong Jin-Keun
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Abstract
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The purpose of this study was to evaluate the flexure stregth of posterior 4-unit acrylic resin bridge with differnet pontic designs : 1) Conventional pontic, 2) Hygienic pontic, and 3) Modified hygienic pontic, All specimens were made of self -
curing acrylic resin for provisional restorations. Self - curing acrylic resin was filled in a silicone mold by the drop - on technique ; and was polymerized in a pressure spot under 20 psi pressure. The test specimens which were simply shaped posterior 4 - unit bridge were 38mm long, 4mm wide, and 8.5mm thick(connector 3mm thick). Each specimen was subjected to an increasing load of Instron machine with its tip centered on the specimen at 90 - degree angle, and the machine was operated with its load cell of 50kg and its crosshead speed, 2mm/minute ; and then and load values at the moment of the fracture of them were recorded. This study was also performed to analyze their stress distributions by the finite element method. @ES The obtained results were as follows : @EN 1. Flexure strength of the hygienic pontic(9.78kg) and the modified hygienic pontic(10.17kg) was higher than that of conventional pontic(6.9kg). But no significant difference was found between the hygienci pontic and the modified hygienic pontic. The above statistic values were appraised by ANOVA and Duncan’s multiple range test. 2. Stress was concentrated on the middle portion in every group ; and the stress of conventional pontic was found the greatest of all pontic designs.
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