Root Canal Morphology — MFDS Part 1 MCQ

Instant feedback + full explanation. One question, done properly.

HardAnatomy (Head & Neck)Root Canal MorphologyMFDS Part 1

Which of the following permanent teeth is most characteristically associated with marked variation in root and canal number and has the highest reported prevalence of C-shaped canal anatomy?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: E — Mandibular first premolar

The mandibular first premolar is correct. Although commonly single-rooted with one principal canal, it shows clinically important variation in root number, canal division and rejoining, apical foramina, accessory canals, radicular grooves and C-shaped configurations. A systematic review of atypical radicular anatomy found that this tooth had the highest reported prevalence of C-shaped canals. The maxillary first molar is also endodontically complex, principally because its mesiobuccal root frequently contains a second canal, but its distobuccal and palatal roots are comparatively consistent and C-shaped anatomy is rare. Mandibular lateral incisors may contain two canals that merge, whereas maxillary central incisors and canines usually have a single root and canal. Thus, the combined features in the stem most specifically identify the mandibular first premolar.

Reference: Nino-Barrera J et al. Atypical Radicular Anatomy in Permanent Human Teeth: A Systematic Review. Critical Reviews in Biomedical Engineering. 2022;50(1):19-34. https://pubmed.ncbi.nlm.nih.gov/35997108/