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KMID : 0362220130400020153
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Journal of The Korean Research Society for Dental Materials
2013 Volume.40 No. 2 p.153 ~ p.160
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The effect of thermal cycling on abrasive wear behavior and tensile strength of composite resin
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Kim Min-Jeong
Song Yong-Beom
Park Il-Song
Yu Mi-Kyung
Lee Min-Ho
Bae Tae-Sung
Lee Kwang-Won
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Abstract
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The objective of this paper was to evaluate the abrasive wear behavior of restorative composite resin after thermal cycling. The test materials used in this study are Synergy(SG), Filtek™ Z350 XT(Z3), GRADIA® DIRECT anterior(GD), Filtek™ Z250(Z2), CLEARFILL AF-X(CL), Heliomolar®(HM), Metafil CX(MF). Among these composite resin materials, one group was immersed in distilled water for 10 days at 37℃ while the other was subjected to thermal cycling at 5℃ and 55℃ in a water bath for 10,000 cycles. Subsequently, they were subjected to toothbrush abrasion test using a wear testing machine for 100,000 brushings under an applied normal load of 1.5 N. The surface roughness of the composite resin materials before and after abrasion testing was measured using a surface profilometer and their morphological features were assessed using scanning electron microscope (SEM). The tensile strength of the composite resin materials immersed in deionized water and those subjected to thermal cycling were evaluated using a universal testing machine.
The mean surface roughness (Ra) of the composite resin materials immersed in deionized water for 10 days at 37℃ is lesser than 0.1 ㎛ whereas SG, HM, MF subjected to thermal cycling showed Ra values higher than 0.1 ㎛ and their Ra values in comparison with other materials in the same group had a significant difference (p＜0.05). The abrasive wear behavior is obvious in the matrix of all the composite resins tested and the shape of fillers is clearly evident for those subjected to thermal cycling. The loss of filler material and the formation of cracks on the matrix as well as at the interface between the filler and the matrix are also observed for the composite resin samples subjected to thermal cycling. The tensile strength of CL is 74.6 ㎫, which is the highest value while that of Z3 and MF are 36.2 ㎫ and 37.5 ㎫, respectively, which is the lowest among all the composite resin materials immersed in deionized water. Among the composite resin materials subjected to thermal cycling, CL exhibits a higher tensile strength of 65.5 ㎫ whereas the MF offers a very low tensile strength of 16.1 ㎫, which is more than half of the value obtained for the same sample immersed in deionized water.
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KEYWORD
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Composite resin, thermal cycling, abrasive wear, tensile strength
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