根管治療過程對牙齒之阻尼性質影響

Effects of Endodontic Treatment on Damping Properties of Teeth

張維仁(Wei-Jen Chang) ； 彭伯宇(Bou-Yue Peng) ； 黃豪銘(Haw-Ming Huang) ； 張凱榮(Kai-Jung Chang) ； 林哲堂(Che-Tong Lin) ； 李勝揚(Sheng-Yang Lee)

《中華民國家庭牙醫學雜誌》 3卷4期 (2009/03) Pp. 31-36

https://doi.org/10.6566/JFD/2009.3(4).31

摘要

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.

關鍵字

根管治療 ； 黏彈性質 ； 阻尼比 ； 振動分析

並列摘要

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.

並列關鍵字

endodontic treatment ； viscoelastic property ； damping ratio ； vibrationalanalysis