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시효와 열순환 처리가 수복용 복합레진의 인장강도에 미치는 영향

An Effect of Aging and Thermocycling on the Tensile Strength of Restorative Composite Resins

유미경|이광원|이미정
대한턱관절교합학회 (Korean academy of stomatognathic function and occlusion)|2005.06|구강회복응용과학지 (Journal of Dental Rehabilitation and Applied Science)|제21권 제1호|pp. 15-23

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참고문헌

주제분류치의학

초록

Abstract

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.

참고문헌 (17)

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