RETREATY : CONSERVATIVE RETREATMENT FOR UNUSUAL ANATOMY  “MB1, MB2, MB3”

There are multiple reasons a primary root canal therapy may be unsuccessful. Before taking on a retreatment case, the clinician must determine if there is an improvement to be made and, thus, a favorable prognosis to be obtained. Among the reasons initial therapy may have failed include insufficient debridement of tissues, incomplete obturation, missed anatomy, coronal leakage, and/or vertical root fracture. In this case report we will see an unusual anatomy with 3 canals in the mesial root (mb1, mb2 and mb3): during the initial treatment two out of three canals were missed (mb2,mb3), disinfection was insufficient disinfection and and the other canals were under-filled: all these reasons led to the failure of the therapy. Choosing the right instrument with…