Re-treating a maxillary second molar with 6 root canals assisted by cone beam computed tomography.

It is important to sterilize and obturate the entire expanse of the root canal system effectively to prevent endodontic failure. This article presents a case involving endodontic re-treatment of a maxillary second molar with an unusual morphology consisting of 6 root canals. Five were identified during clinical exploration, and the sixth was identified using cone beam computed tomography.