Radiographic Evaluation of Root and Canal Morphologies of Third Molar Teeth in Iranian Population

Background: Root and canal morphology of teeth has a significant role in endodontic treatment success. Third molars have strategic roles after losing first and second molars. Objectives: This study investigated the morphology of permanent third molar using radiography in Dentistry University of Hamadan during ۲۰۱۱. Materials and Methods: In this experimental study, ۳۵۲ extracted molars (۱۷۹ maxillary and ۱۷۳ mandibular molars) were collected. After preparing access cavity and file placement in canals, to investigate the number of roots, canals and canal type periapical radiographies were taken from two directions (mesiodistal and buccolingual). The results were analyzed using SPSS version ۱۶.۰ software and descriptive statistics. Results: According to the study on ۱۷۳ mandibular third molars, ۹۲.۴%, ۴.۶%, and ۲.۸۹% had two, one, and three roots, respectively. Majority of them had two or three canals and most of mesial root canals were type ۲; but in ۱۷۹ maxillary third molars, findings showed that ۶۷.۶%, ۱۵%, ۱۱.۷%, and ۵.۶% of teeth had three, one, two, and four roots, respectively, majority of which had three canals (۶۸.۷%). Canals of ۱۰۰% of distobuccal and palatal roots and ۹۱% of mesiobuccal roots were type ۱. Conclusions: However, root and canal anatomies of third molar teeth are unknown, but studies focusing on third molar teeth have shown their possibility of treatment