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KMID : 0988720050210010015
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Journal of the Korean Academy of Stomatognathic Function and occlusion
2005 Volume.21 No. 1 p.15 ~ p.23
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An Effect of Aging and Thermocycling on the Tensile Strength of Restorative Composite Resins
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Lee Mi-Jeong
Yu Mi-Kyung
Lee Kwang-Won
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Abstract
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The purpose of this study was to evaluate effect of aging and thermocycling on the tensile strength of restorative composite resins. Eight commercially available light-cured restorative composites (Heliomolar: HM, Palfique Estelite: PE, Spectrum: ST, UniFil-F: UF, Z100: ZH, Clearfil AP-X: CA, P60: PS, and Palfique Toughwell: PT) were selected as experimental materials. Rectangular-shaped tensile test specimens were fabricated in a teflon mold giving 5 ㎜ in gauge length and 2 ㎜ in thickness. All samples were stored in distilled water at 37℃ for 100 days. Every 10 days, specimens were thermocycled for 1,000 cycles with 15 seconds of dwelling time in each 5℃ and 55℃ water baths. Tensile testing was carried out at a crosshead speed of 0.5 ㎜/min and fracture surfaces were observed with a scanning electron microscope. The results obtained were summarized as follows; 1. The strength degradation of thermocycled group was severer than that of the aged group (P<0.01). 2. The tensile strength of the CA and ST groups were significantly higher than that of other groups after thermocycling treatment (P<0.05). 3. Fracture surfaces showed that the composite resin failure developed along the matrix and the filler/resin interface region.
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KEYWORD
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Aging, Thermocycling, Tensile Strength, Composite Resins
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