RESUMO
The case report here tries to describe the rare variation of root canal morphology in a mandibular first molar, which is rare in occurrence in literature. This case report presents a relatively rare case of mandibular first molar with single root and a single root canal in a 24-year-old female patient.. Cone-beam computed tomography (CBCT) was employed to confirm the extension of the unusual anatomy. Ambiguity in the canal morphology of the first molar is quite common. Knowledge of variations in internal anatomy of teeth is important for success in endodontic treatment. Root canal morphology is limitless in its variability and clinicians must be aware that anatomic variations constitute a formidable challenge to endodontic success. Hence, clinicians have to take utmost care when these cases with single canal and single root come in our practice.