Presence of Mesiobuccal 2 and Mesiobuccal 3 Canal in Maxillary First Molar: An Illusion.

Successful endodontic treatment involves a proper access cavity preparation, biomechanical principles, and three-dimensional obturation. Thus, the clinician should have a through knowledge of anatomy and morphology of the root canal system. Failure in root canal therapy may be due to inability in locating the canal and its proper debridement. The configuration and a number of root canals in the maxillary first molars have been discussed for more than half a century. Maxillary first molars commonly present with three roots and three canals, with a second mesiobuccal canal (MB2) and (MB3). The current case reports describe the presence of extra canals MB2 and MB3 in a maxillary first molar.