MB2 Canal Prevalence — NDEB AFK MCQ
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Correct answer: B — Maxillary first molar
The maxillary first molar has the highest prevalence of a second mesiobuccal canal (MB2), found in approximately 60-70% of cases in micro-CT studies (though clinical detection rates are lower at ~40-60%). The MB2 canal is the most commonly missed canal in endodontics and is a significant cause of endodontic treatment failure. The use of dental operating microscope and CBCT has significantly improved MB2 detection.
Reference: Torabinejad – Endodontics: Principles and Practice, 6th ed., 2021