Radix Entomolaris — NDEB AFK MCQ
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Correct answer: E — Mandibular first molar
A supernumerary root on the mandibular first molar — distolingual (radix entomolaris) or mesiobuccal (radix paramolaris) — is found in approximately 3-33% of cases depending on ethnicity (higher prevalence in Asian, Arctic, and Amerindian populations). The radix entomolaris is more common than the paramolaris. Its presence is suggested by an asymmetric distal root outline on periapical radiograph and confirmed with CBCT. Missing this extra root/canal is a cause of endodontic failure.
Reference: Torabinejad – Endodontics: Principles and Practice, 6th ed., 2021