Abstract
Knowledge about both the external and internal anatomy of teeth is essential for the success of endodontic treatment. The mandibular molars are prone to anatomical variations such as the presence of an additional root located lingual to the tooth which is named Radix Entomolaris (RE). The aim of the present study was to describe the internal and external morphology of RE, as well as evaluate the prevalence, etiology, and clinical protocol of this atypical anatomy by means of a literature review. The knowledge of these anatomical variations as well as clinical guidelines for the diagnosis and endodontic treatment of RE can minimize procedural errors during root canal preparation, and provide an adapted clinical approach for the dentists, thus culminating in the success of endodontic treatment.
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