Özet:

Objective: The aim of this study was to compare the cyclic fatigue resistance of the new and used Revo-S nickel-titanium rotary file system using simulated canals. Materials and Method: A total of 72 new and twice clinically used Revo-S SC1 (25/.06), Revo-S SC2 (25/.04), and Revo-S SU (25/.06) files, 12 from each group, were included in the study. For the cyclic fatigue resistance tests, a stainless-steel block with an inner diameter of 1.5 mm, a curved simulated canal with a 60° angle of curvature, and a radius of curvature of 5 mm was used. The test system was filled with distilled water and the temperature was kept constant at 35 ± 1 °C. The files were rotated in the simulated canal until fracture occurred. The time until fracture occurred for each file was recorded with a stopwatch and the number of cycles of the files to the fracture was calculated. Data were evaluated using 1-way analysis of variance and post-hoc Tukey test. Results: The mean number of cycles of the files to the fracture was found to be the highest in the new SC2 group (912.3 ± 76.8), and the lowest in the used SU group (204.2 ± 59.6). While there was no statistically significant difference in cyclic fatigue resistance between new and used files for SC1 and SC2 files (p>0.05), a significant difference was found for SU (p<0.05). Conclusion: Within the limitations of this study; it was found that there was a decrease in cyclic fatigue resistance of all files after clinical use, but this decrease was significant only in the SU file group.

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