Radix entomolaris in mandibular first molars-an endodontic challenge

Awareness of morphological variations of the tooth can contribute to the successful outcome of the endodontic treatment. The morphological variations of the mandibular first molar radix entomolaris (RE) in terms of root inclination and root canal curvature demand careful clinical approach to avoid procedural errors during endodontic therapy. This paper describes 2 case reports of mandibular first molar with RE.