Document Type: Original Article


1 Assistant Professor, Department of Endodontics, School of Dentistry, Shiraz University of Medial Sciences

2 Dentist


Statement of Problem: The major objectives of root canal treatment are removal of all irritant from the root canal space and accomplish a proper shaping of the space and total obturaion of this space. So, diagnosis of root curvature is critical and can affect on proper preparation and prevention of procedural accidents.Purpose: The aim of this study was to measure and evaluate the root curvature of permanent teeth that were treated at Endodontic Department of Shiraz Dental School (2001-2002).Materials and Methods: In this case control study, all endodontic treated patients with standardized radiographic films to determine the working length were analyzed and the angel of root curvature, were evaluated by Schneider method. After image projection and drawing of two lines, one on long axis of the canal and the other from apical foramen to the first line, the constructed angel was measured.Results: From 398 evaluated films, the root curvatures in posterior teeth were more than that in anterior teeth. Most of the roots (80%) had root curvatures directed to the mesial or distal plane although root curvatures to distal plane were more common. All of the roots had mild to moderate curvatures (0-25 degrees) except the mesial root of the first mandibular molar that had severe root curvature (more than 25 degrees). The mean of root curvature of permanent teeth were between 2.76 to 28.28 degrees.Conclusion: The results indicated that root curvatures in teeth were common and practitioners should be aware in the case of any difficulty, and refer the case to a specialist.Key words: Root Curvature, Permanent Teeth, Schneider Method