Evaluation of distortion and fracture of flexmaster and profile files during root canal preparation conducted by endo It control instrument in human molar

Although rotary instruments have been used for cleaning and shaping procedures during root canal preparation; nevertheless, the most effective technique regarding the use of these instruments has not been determined yet. Therefore, this study was carried out to evaluate the distortion and fracture of Flexmaster and Profile files during root canal preparation. This process was carried out by Endo IT Control instruments on human molar teeth. A total of 60 human molar teeth with 10 -30 curved roots were randomly divided in two groups. Flexmaster and Profile files were used in the first and second groups using crown-down technique. The instrumentation speed, time and torque were controlled using Endo IT Control according to manufacturer's instructions. The fracture and distortion of files were evaluated in both groups. There was not any instrument fracture in the study, but 3 distortion cases were observed [2 in Profile group and 1 in Flexmaster one]. The difference between distortions in two groups was not statistically significant. Likewise, no relationship was found between distortion and repeated use of instruments in the sample. There was not any difference regarding fracture between the two groups. However, distortion of files in Profile group was more than Flexmaster group when Endo IT Control instrument was used