Maxillary first molar with three canals in mesiobuccal root: A case report.

Knowledge of internal dental morphology is a complex and extremely important for planning and performing endodontic therapy. Proper location of additional canals in roots, especially of maxillary first molar, is very fundamental in high rate success of root canal therapy. This article describes the identification and treatment of a maxillary first molar exhibiting three canals in the mesiobuccal root.