Sina Haghanifar - Associate Professor of Oral and Maxillofacial Radiology, Dental Health Research Center Oral and Maxillofacial Radiology Department
Mehran Ebrahimzadeh Hassanabadi - Dental Student, Faculty of Dentistry, Student Research Committee, Mazandaran University of Medical Sciences, Sari, Iran
Jamshid Yazdani Charati - Associate Professor, Biostatical, Faculty of School of health, Mazandaran University of Medical Sciences, Sari, Iran
Abbas Mesgarani - Assistant Professor of Endodontics, Dental Faculty, Mazandaran University of Medical Sciences, Sari, Iran
Azam Haddadi Kohsar - Assistant Professor of Endodontics, Dental Faculty, Mazandaran University of Medical Sciences, Sari, Iran
Ali Malekzadeh Shafaroudi - Dental Student, Faculty of Dentistry, Student Research Committee, Mazandaran University of Medical Sciences, Sari, Iran

Background and Objective: The purpose of the mechanical cleaning of the root canal is to create a conical shape for 3D filling of the canal area. Excessive dentin removal from one side of the canal, as compared to other parts located at an equal distance to the longitudinal axis of the tooth, causes an error called the canal transportation.Materials and Methods: In this study, the canal transportation was evaluated by hand K-flexo file Mtwo and,Dia-pt rotary file using Cone Beam Computed Tomography (CBCT). This is an Ex-vivo study conducted on 60 extracted first molars. Root curvature was measured by Schneider s method. Preparation was performed in three groups of 20 with manual and Mtwo and Dia-pt files. CBCT images were prepared before and after clearing the canals.Finding: Data were analyzed using SPSS 18 Software. Based on the results of the kruskal wallis test, there are differences between the three files in the 2 and 3 mm sections (respectively (p = 0.01) (p = 0.01)). However, there is no difference in the cross-section of 2.5 mm based on kruskal wallis test (p = 0.16).Conclusion: The findings of this study indicate that the channel displacement in the Mtwo system is the least. And this system is better than K-Flexo file and Dia-pt in following the shape of the canal and creating a conical canal with the least deviation from the channel.

Cleaning, Transport, Root Canal Treatment, Mtwo, Dia-pt, Kflexofile