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KMID : 0358920010280030464
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Journal of the Korean Academy of Pedodontics
2001 Volume.28 No. 3 p.464 ~ p.470
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AN EXPERIMENTAL STUDY ON THE TENSILE STRENGTH OF POSTERIOR RESIN-BASED COMPOSITES
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Kim Jae-Gon
Lee Yong-Hee
Yang Cheol-Hee
Baik Byeong-Ju
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Abstract
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The purpose of this study was to evaluate the tensile strength of light-cured restorative posterior resin-based composites. Five commercially available light-cured composites(Denfil : DF, P60 : PS, Unifil S : US, Z100 : ZH, Z250 : ZT) were used. Rectangular tension test specimens were fabricated in a teflon mold giving 5mm in gauge length and 2mm in thickness. Specimens were subjected to the 5,000 thermal cycles between and and the immersion time in each bath was 15 second per cycle. Tensile testing was carried out with Instron at a crosshead speed of 0.5mm/min and fractured surface were observed with scanning electron microscope. The obtained results were summarized as follows; 1. The tensile strength of PS was highest. PS was significantly higher than DF, US and ZH(p<0.05) but in the case of ZT was similar to PS(p>0.05). 2. The tensile strength DF was lowest. DF was significantly lower than PS, US, ZH and ZT(p<0.05). 3. The tensile strength of US and ZH were significantly lower than PS and ZT(p<0.05). but were significantly higher than DF(p<0.05). The tensile strength of US and ZH were similar(p>0.05).
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KEYWORD
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Composite resin, Tensile strength, Posterior teeth
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