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KMID : 1004520120280010057
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Journal of Dental Rehabilitation and Applied Science
2012 Volume.28 No. 1 p.57 ~ p.66
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Effect of Internal Stress on Cyclic Fatigue Failure in ProTaper Universal
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Jo Yun-Sung
Kim Jin-Woo
Park Se-Hee
Cho Kyung-Mo
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Abstract
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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 ㎜ 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
N㎝. 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.
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KEYWORD
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Auto-reverse, Auto-stop, Cyclic fatigue failure, Internal stress, ProTaper Universal, Separation
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