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

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 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.

References

  1. Soderholm KJ. Degradation of glass filler in experimental composites. J Dent Res 60:1867-1875, 1981 https://doi.org/10.1177/00220345810600110701
  2. Indrani DJ, Cook WD, Televantos F, Tyas MJ, Harcout JK. Fracture toughness of water-aged composite restorative materials. Dent Mater 11:201-207, 1995 https://doi.org/10.1016/0109-5641(95)80019-0
  3. Bae TS, Kim TJ, Kim HS. Effect of Immersion in water and thermal cycling on the mechanical properties of light-cured composite resins. J KOSOMBE 17:327-335, 1996
  4. Arikawa H, Kuwahata H, Seki H, Kanie T, FujiiK, Inoue K. Deterioration of Mechanical properties of composite resins. Dent Mater J 14:78-83, 1995 https://doi.org/10.4012/dmj.14.78
  5. Yamamoto M, Takahashi. Tensile fatigue strength of light cure composite resins for posterior teeth. Dent Mater J 14:175-184, 1995 https://doi.org/10.4012/dmj.14.175
  6. Asmussen E, JOrgensen KD. Fatigue strength of some resinous materials. J Dent Res 90:76-79, 1982
  7. Roulet JF. Degradation of dental polymers: 1st ed New York: Karger, pp60-160, 1987
  8. Drummond JL. Cyclic fatigue of composite restorative materials. J Oral Rehabil 16:509-520, 1989 https://doi.org/10.1111/j.1365-2842.1989.tb01372.x
  9. Miyazaki T, Fujisima A, Suzuki E, Miyaji T. Tensile strength of posterior restorative composite resins. J J Dent Mater J 5:685-693, 1986
  10. Fujisima A, Miyazaki T, Kuneshita H, Suzuki E, Miyaji T. The direct tensile test of composite resins using the small specimen -Effect of the preparation of specimen, the size of specimen and the testing condition on the tensile properties- J J Dent Mater 9:728-733, 1990
  11. Ban S, Haserawa J, Anusavice KJ. Effect of loading conditions on bi-axial flexure strength of dental cements. Dent Mater 8:100-104, 1992 https://doi.org/10.1016/0109-5641(92)90063-I
  12. Chen TM, Brauer GM. Solvent effects on bonding organosilane to silica surfaces. J Dent Res 61:1439-1443, 1982 https://doi.org/10.1177/00220345820610121301
  13. Kamel IL, Neri GA. Radiation modified filler for dental restorative composities. J Math Phys Chem 14:603-611, 1979
  14. Mair LH, Vowel R. The effect of thermal cycling on the fracture toughness of seven composite restorative materials. Dent Mater 5:23-26, 1989 https://doi.org/10.1016/0109-5641(89)90087-0
  15. Troung VT, Tyas MJ. Prediction of in vivo wear in posterior composite resins : A fracture mechanics approach. Dent Mater 4:318-327, 1988 https://doi.org/10.1016/S0109-5641(88)80044-7
  16. Bascom WD. The surface chemistry of moisture induced composite failure. In : Interface chemistry in polymer Matrix Composites. vol 6(ed Pluddenmann EP), Academic Press, New York 79, 1974