Effect of Storage Temperature on the Mechanical Properties of Resin Composites

DOI Open Access
  • Akitomo RIKUTA
    Department of Operative Dentistry, Nihon University School of Dentistry Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry
  • Yukari OGURA
    Department of Operative Dentistry, Nihon University School of Dentistry
  • Aiko SATO
    Department of Operative Dentistry, Nihon University School of Dentistry
  • Risa TERAI
    Department of Operative Dentistry, Nihon University School of Dentistry
  • Takayuki SUZUKI
    Department of Operative Dentistry, Nihon University School of Dentistry
  • Shigeyuki MASUTANI
    Department of Operative Dentistry, Nihon University School of Dentistry Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry
  • Masashi MIYAZAKI
    Department of Operative Dentistry, Nihon University School of Dentistry Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry
  • Gaku HONJO
    Department of Operative Dentistry, Nihon University School of Dentistry Dental Care Fujisawa Clinic
  • Natsu SUMINO
    Department of Operative Dentistry, Nihon University School of Dentistry

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Other Title
  • コンポジットレジンペーストの保管温度条件がその機械的性質に及ぼす影響

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 Purpose: The effects of the storage conditions of resin pastes on their mechanical properties were investigated by measuring flexural strength, Knoop hardness and width of contraction gap.<br> Methods: Estelite Σ Quick, BeautifilⅡ, Filtek Supreme Ultra, Solare and an injectable resin composite MI Fill were used. The storage conditions employed were 5℃ (cold condition), 23℃ (room condition), or 45℃ by using a composite softener (heat condition). Flexural strength, elastic modulus, and Knoop hardness were measured. Contraction gap widths of the restorations filled into the cavities in the bovine teeth were measured.<br> Results: Flexural strength and elastic modulus were higher for the specimens stored at the room and heat conditions. Knoop hardness was higher for the specimens stored at the room and heat conditions, but different between resin pastes used. Contraction gap formations were observed for the cold condition, and the gap width decreased with higher temperature.<br> Conclusion: Mechanical properties and contraction gap formation were affected by the storage temperature of resin pastes.

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