Nonsurgical Endodontic Treatment of an Atypical Mandibular First Molar with a dens invaginatus and a Large Periradicular Radiolucency - A Case Report.

This case report describes the successful management of an atypical mandibular molar with Oehler's Type II dens invaginatus and a large periradicular radiolucency with nonsurgical endodontic treatment. A 14-year-old male patient reported with pain and swelling associated with tooth #30. Clinical examination revealed that tooth #30 had an unusual coronal morphology. The intraoral periapical radiograph and cone beam computed tomography revealed an Oehler's Type II dens invaginatus with a large periradicular radiolucency. Nonsurgical root canal treatment was performed and the patient was followed-up for 46 months. Following the root canal treatment, the patient had no symptoms, no tenderness to percussion or palpation, and the tooth was not mobile. At 46 months, the radiographic examination confirmed that satisfactory healing of the periapical tissues had occurred.