Diagnosis, Evaluation, and Endodontic Management of Rare Four-Rooted Mandibular Second Molar Using CBCT.

: When endodontically diagnosing and evaluating the morphology and anatomy of roots and root canals, especially in multirooted teeth, clinicians must exercise extremely keen vision and give careful attention to minute details. Fundamental knowledge of the most common anatomic characteristics and the possible variations of these characteristics is necessary to provide successful endodontic therapy. While all mandibular molars have significant variations in roots and root canal configuration, mandibular second molars perhaps present the biggest challenge. This article highlights the endodontic management of a mandibular second molar with four roots (two mesial and two distal) with one canal in each root and the cone-beam computed tomography (CBCT) evaluation of the tooth, along with orifice location assessment using developmental root fusion lines.