In the past researches, it was found that there exists a high failure rate of an endodontic teeth subjected to a traumatic load. Traditionally, this phenomenon was contributed to the reduction of teeth strength due to endodontic treatment. From biomaterials viewpoint, a teeth is a composite with viscoelastic mechanical property. However, the viscosity properties on the stress responses of an impacted tooth was ignored in biomechanical studies. In this study, we hypothesized that damping ratio of teeth in the different endodontic treatment stages, such as cleaning & shaping, RCF+IRM filling, RCF+ resin filling, and post& crown treatment. The mean values of the tested samples are 14.42±2.17%, 8.50±0.53%, 10.84±1.70%, 13.41±1.92%, and 7.89±1.70% for intact group, cleaning& shaping group, RCF+IRM filling group, RCF+resin filling, and post+ crown, respectively. In addition, significant differences were found among the groups (p<0.05). These results indicated that the transduction and distribution of the stress in teeth may change when altering the damping ratio values of the teeth. In conclusion, for fracture resistance analysis, teeth viscosity is an important properties for stress distribution and should not be ignored.
Original languageTraditional Chinese
Pages (from-to)31-36
Number of pages6
Issue number4
Publication statusPublished - 2009



  • endodontic treatment
  • viscoelastic property
  • damping ratio
  • vibrationalanalysis

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