Effect of internal stress on cyclic fatigue failure in .06 taper ProFile

Restorative Dentistry and Endodontics Pub Date : 2012-05-01 DOI:10.5395/RDE.2012.37.2.79

H. Jung, Jin-Woo Kim, Kyung-Mo Cho, Se-Hee Park

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Abstract

Objectives: The purpose of this study was to evaluate the relation between intentionally induced internal stress and cyclic fatigue failure of .06 taper ProFile. Materials and Methods: Length 25 mm, .06 taper ProFile (Dentsply Maillefer), and size 20, 25, 30, 35 and 40 were used in this study. To give the internal stress, the rotary NiTi files were put into the .02 taper, Endo-Training-Bloc (Dentsply Maillefer) until auto-stop by torque controlled motor. Rotary NiTi files were grouped by the number of induced internal stress and randomly distributed among one control group and three experimental groups (n = 10, Stress 0 [control], Stress 1, Stress 2 and Stress 3). For cyclic fatigue measurement, time for separation of the rotary NiTi files was recorded. The fractured surfaces were observed by field emission scanning electron microscope (FE-SEM, SU-70, Hitachi). The time for separation was statistically analyzed using two-way ANOVA and post-hoc Scheffe test at 95% level. Results: In .06 taper ProFile size 20, 25, 30, 35 and 40, there were statistically significant difference on time for separation between control group and the other groups (p

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内应力对0.06锥度曲线循环疲劳失效的影响

目的:本研究的目的是评估故意诱导内应力与0.06锥度轮廓的循环疲劳破坏的关系。材料与方法:长度为25mm，锥度为0.06 (Dentsply Maillefer)，尺寸为20、25、30、35和40。为了获得内应力，旋转NiTi锉放入0.02锥度的Endo-Training-Bloc (Dentsply Maillefer)中，直到转矩控制电机自动停止。旋转NiTi锉按诱导内应力个数分组，随机分为1个对照组和3个实验组(n = 10，应力0 [control]，应力1，应力2和应力3)。循环疲劳测量时，记录旋转NiTi锉的分离时间。采用场发射扫描电镜(FE-SEM, SU-70, Hitachi)对断裂表面进行观察。分离时间采用双因素方差分析和事后Scheffe检验，在95%水平上进行统计学分析。结果:0.06锥度轮廓尺寸为20、25、30、35、40时，对照组与其他组的分离时间差异均有统计学意义(p < 0.05)

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Restorative Dentistry and Endodontics

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