Mandibular Second Premolar Anatomy — NDEB AFK MCQ
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Correct answer: A — Mandibular second premolar
The mandibular second premolar has the most variable root canal anatomy of any single-rooted tooth, with a single canal in only approximately 60-70% of cases. It may have two or even three canals (Vertucci Types II-V). The Vertucci Type V (single canal dividing into two separate canals near the apex) is particularly common (~25%). This variability makes it one of the most challenging teeth for endodontic treatment, with a relatively high failure rate.
Reference: Torabinejad – Endodontics: Principles and Practice, 6th ed., 2021