The Hidden Curve: A Morphological Mystery of Radix Entomolaris

AbstractRadix entomolaris (RE) is an anatomical variation characterized by the presence of an additional distolingual root in mandibular molars, most commonly the first molar. This supernumerary root presents significant clinical implications in endodontic diagnosis, treatment planning, and execution. Failure to recognize and manage this anatomical variation can lead to incomplete debridement, persistent infection and eventual treatment failure. The prevalence of RE varies among different populations and ethnic groups, necessitating careful radiographic examination and where necessary, advanced imaging techniques such as cone beam computed tomography (CBCT) for accurate detection. Clinicians must be aware of the root canal configuration anomalies associated with RE and adapt access cavity design and instrumentation techniques accordingly to enhance a successful treatment outcomes. This article presents a case report of mandibular first molar with extra root that was successfully treated using appropriate access cavity, instrument and techniques.