Endodontic Retreatment of a Maxillary Second Molar with Fused and Calcified Mesial Root Evaluated By Cone-Beam Computed Tomography: A Case Report

Abstract

Aim (background): Knowledge of the root canal anatomy is necessary for clinicians to achieve success with endodontic treatments. We herein report the endodontic retreatment of the root and canal variant of maxillary second molar, which is rare in a Japanese population. This tooth had two roots at the middle area and one root at the apical area. Materials and methods: The root canals were calcified, thus cone-beam computed tomography was performed to aid in the negotiation, helping achieve patency. The root canals were filled with calcium hydroxide paste, and the tooth was then temporized with Caviton. One week later, the patient’s pain on palpation and percussion had disappeared. After irrigation and drying, the MBR canal was obturated with Thermafil, and the canals in the DBR and PR were obturated with warm vertical compaction. Canals was used as sealer. After periodontal treatment, the tooth was restored with a cast post and core and a metal crown. Results: After the endodontic retreatment, the patient’s symptoms were all successfully resolved. Conclusion: Having sufficient knowledge and a correct diagnosis led to appropriate root canal treatment in this case. We herein report the endodontic retreatment of the root and canal variant of Japanese MSM, which is rare in a Japanese population. We feel that these findings will improve the knowledge of the root and canal morphology of MSM and help ensure endodontic success among Japanese clinicians.