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

시효와 열순환 처리가 수복용 복합레진의 인장강도에 미치는 영향

  • Lee, Mi-Jeong (Department of Conservative Dentistry & Institute for Oral Bioscience, School of Dentistry, Chonbuk National University) ;
  • Yu, Mi-Kyung (Department of Conservative Dentistry & Institute for Oral Bioscience, School of Dentistry, Chonbuk National University) ;
  • Lee, Kwang-Won (Department of Conservative Dentistry & Institute for Oral Bioscience, School of Dentistry, Chonbuk National University)
  • 이미정 (전북대학교 치과대학 치과보존학교실 및 구강생체과학연구소) ;
  • 유미경 (전북대학교 치과대학 치과보존학교실 및 구강생체과학연구소) ;
  • 이광원 (전북대학교 치과대학 치과보존학교실 및 구강생체과학연구소)
  • Published : 2005.06.30


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 mm in gauge length and 2 mm in thickness. All samples were stored in distilled water at $37^{\circ}C$ for 100 days. Every 10 days, specimens were thermocycled for 1,000 cycles with 15 seconds of dwelling time in each $5^{\circ}C$ and $55^{\circ}C$ water baths. Tensile testing was carried out at a crosshead speed of 0.5 mm/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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