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Effect of Internal Stress on Cyclic Fatigue Failure in ProTaper Universal  

Jo, Yun-Sung (Department of Conservative Dentistry, Gangneung-Wonju National University, School of Dentistry)
Kim, Jin-Woo (Department of Conservative Dentistry, Gangneung-Wonju National University, School of Dentistry)
Cho, Kyung-Mo (Department of Conservative Dentistry, Gangneung-Wonju National University, School of Dentistry)
Park, Se-Hee (Department of Conservative Dentistry, Gangneung-Wonju National University, School of Dentistry)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.28, no.1, 2012 , pp. 57-66 More about this Journal
Abstract
The purpose of this study was to evaluate the relation between intentionally induced internal stress and cyclic fatigue failure of ProTaper Universal. ProTaper Universal (Dentsply Maillefer) S1, S2, F1, F2, F3, F4 and F5 (25 mm length) were used in this study. To give the internal stress, the ProTaper Universal were put into the .02 taper Endo-Training-Bloc (Dentsply Maillefer) until auto-stop by torque controlled motor. The rotation speed was 300 rpm and torque value was 1.0 Ncm. ProTaper Universal were grouped by the induced number of internal stress and randomly distributed among one control group and three experimental groups (n=10). The four groups were Stress 0 (control), Stress 1, Stress 2 and Stress 3. These instruments were rotated until separation. For cyclic fatigue measurement, inclined plane was used and time for separation was recorded. It was statistically analyzed using two-way ANOVA and Duncan post-hoc test at 95% confidential level. In all ProTaper Universal, there was statistically significant decrease on time for separation in Stress 3. In F2 and F3, there were statistically significant difference between control group and all experimental groups. And in F4 and F5, Stress 2 and 3 groups showed significantly lower cyclic fatigue resistance from Stress 0 group. In the limitation of this study, cyclic fatigue failure of ProTaper Universal is influenced by accumulated internal stress.
Keywords
Auto-reverse; Auto-stop; Cyclic fatigue failure; Internal stress; ProTaper Universal; Separation;
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