الفهرس 
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Abstract
The study was conducted to evaluate the effect of different sterilization cycles on the cyclic fatigue resistance and cutting efficiency of Reciproc Blue and One Curve rotary files.
For each test of cyclic fatigue and cutting efficiency sixty files of each system were used. Ten of them were used new, ten after three sterilization cycles and ten after six sterilization cycles.
For cyclic fatigue testing a static model was used with a specific device, which allowed the instruments to rotate freely inside a Stainless-Steel artificial simulated root canal with an angle of curvature of 60° degrees and radius of curvature of 5 mm.
For cutting efficiency the file used against a plexiglass and depth of penetration was measured after one minute. The precise length of the plastic block cut in 1 minute was measured in millimetres for all groups.
Two-way analysis of variance, one-way analysis of variance (ANOVA) and t-student tests were conducted. With level of significance was set at 0.05.
The results showed a higher cyclic fatigue resistance for Reciproc Blue than One Curve for the three tested conditions. There was statistically significant difference between Reciproc Blue and One Curve for the three tested conditions. While for cutting efficiency One Curve showed a higher cutting efficiency than Reciproc Blue among all groups. There was statistically significant difference between Reciproc Blue and One Curve for the three tested conditions.
Within the limitations of the study, we conclude that:
While sterilization has no significant effect on cyclic fatigue of some files while have negative effect on others, it has no effect on cutting efficiency.
One Curve has higher cutting efficiency than Reciproc Blue. Reciproc Blue has higher cyclic fatigue resistance than One Curve.