Immersion of Mtwo nickel-titanium rotary files in antiseptic solution and fatigue resistance: Effects and analysis

Background and aims: Widely application of rotary files for endo treatment would force us to obtain an accurate understanding about the characteristics and drawbacks of these instruments. Therefore in this study, the effects of immersion of NiTi M2 rotary file in deconex and sodium hypochlorite solution on the cyclic fatigue resistance was investigated Material and methods: In this exprimental study, 45 NITI M2 rotary files were divided in three groups I) control (without any immersion), II) immestion in deconex for 5 min and III) immesrion in sodium hypochlorite for 5 min and their cyclic fatigue resistance was investigated by using testing device and NCFs were recorded. The obtained results were analysis by using Fisher's statistic and the mean comparisons were carried out by using Tukey Results: The results showed that immersion of NiTi M2 rotary files in streluating solutions provides negative and significant effects on the cycle fatigue resistance and the highest NCF was obtained in the control (890.046) and the lowest was obtained in the files immmersed in deconex (546,076). Therefore, it is suggested to used autocalve as substitution for immersion to strelize NiTi M2 rotary files.