CBCT Imaging of a Rare Case of Radix Entomolaris in Mandibular Second Molar

The presence of an additional supernumerary distolingual root in the mandibular molar is termed Radix Entomolaris (RE). It is common in the mandibular first molar, but its occurrence in the mandibular second molar is scarcely reported in the literature. Two-dimensional imaging can diagnose anatomical root canal variations when taken with different horizontal angulations. With the recent innovations in three-dimensional diagnostic imaging, cone beam computed tomography (CBCT) can aid in unfolding the complexities of the root canal system. Accurate diagnosis by CBCT leads to the success of endodontic treatment. A rare case of radix entomolaris in the mandibular second molar in an Indian female is reported here with three of its CBCT findings. Imaging in all three dimensions, oblique sections and volume rendering by CBCT proved to be of additional help to understand the complex anatomy and root canal morphology of the tooth.