A study on the fracture resistance of composite crowns to cyclic impact

DOI
  • KAJIHARA Yutaro
    Fixed Prosthetic Clinic, Kagoshima University Medical and Dental Hospital
  • MINEMOTO Satoko
    Fixed Prosthetic Clinic, Kagoshima University Medical and Dental Hospital
  • SAKOGUCHI Kenji
    Department of Fixed Prosthetic Dentistry, Graduate School of Medical and Dental Sciences
  • MURAHARA Sadaaki
    Department of Fixed Prosthetic Dentistry, Graduate School of Medical and Dental Sciences
  • TANAKA Takuo
    Department of Fixed Prosthetic Dentistry, Graduate School of Medical and Dental Sciences
  • MINAMI Hiroyuki
    Department of Fixed Prosthetic Dentistry, Graduate School of Medical and Dental Sciences

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Other Title
  • コンポジットジャケットクラウンの繰り返し衝撃に対する破折抵抗性に関する研究

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Description

The purpose of this study was to evaluate the effect of opaque materials, abutment materials and luting materials on the fracture resistance of composite crowns for premolars. Abutment teeth were fabricated with either dental alloy (ME) or composite resin (CR). Composite crowns were fabricated with one of two opaque materials, namely a conventional material (Metacolor Prime Art Top Opaque: TO) and a fiber-premixed material (Metacolor Prime Art Jacket Opaque: JMO) at the internal layer. Two different luting materials, namely composite resin cement (Panavia F2.0: PA) and PMMA resin cement (Super-Bond C&B: SB) were used. A total of 48 specimens for eight groups (n=6) were subjected to 280-N cyclic impact loading at 1.0 Hz. The number of cycles which caused the composite crowns to fracture was defined as its fracture resistance. As a result of three-way ANOVA, a significant difference was observed in opaque materials (p<0.001, TO<JMO) and abutment materials (p<0.001, ME<CR), but no significant difference was observed in cement (p=0.92). Also, the JMO/CR group showed the highest resistance (PA group: an average of 1,174,625 times, SB group: an average of 1,067,541 times) in each luting material.

Journal

  • Adhesive Dentistry

    Adhesive Dentistry 33 (1), 24-31, 2015

    Japan Society for Adhesive Dentistry

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