AN EXPERIMENTAL STUDY ON THE TENSILE STRENGTH OF POSTERIOR RESIN-BASED COMPOSITES

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Journal of the Korean Academy of Pediatric Dentistry 2001;28(3):464-470.
Published online August 31, 2001.

AN EXPERIMENTAL STUDY ON THE TENSILE STRENGTH OF POSTERIOR RESIN-BASED COMPOSITES

구치부 복합레진의 인장강도에 관한 실험적 연구

김재곤, 이용희, 양철희, 백병주

전북대학교 치과대학 소아치과학교실

Abstract

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 5℃ and 55^℃ 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).

Key Words: Composite resin, Tensile strength, Posterior teeth