Mandibular Canal Position — MFDS Part 1 MCQ

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ModerateAnatomy (Head & Neck)Mandibular Canal PositionMFDS Part 1

On cross-sectional imaging of a typical adult mandible, at which listed tooth region is the mean distance between the mandibular canal and the buccal cortical plate smallest?

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Correct answer: A — Second premolar region

The correct answer is A, the second premolar region. As the mandibular canal passes anteriorly towards the mental foramen, it approaches the buccal cortex; CBCT morphometry shows that its mean distance from the buccal cortical plate is smallest at the second premolar. Option D reverses the relevant relationship: in the third molar region, the canal is closest to the lingual cortical plate. The first and second molar regions do not have the smallest mean buccal distance. The canine region is anterior to the usual position of the mental foramen; any anterior continuation is generally the smaller, variable incisive canal rather than the principal mandibular canal segment. This relationship is clinically relevant when interpreting cross-sectional imaging and planning surgery or implant placement near the inferior alveolar neurovascular bundle.

Reference: Srivastava S, et al. Assessment of the Proximity of the Inferior Alveolar Canal with the Mandibular Root Apices and Cortical Plates—A Retrospective Cone Beam Computed Tomographic Analysis. Journal of Personalized Medicine. 2022. https://pubmed.ncbi.nlm.nih.gov/36579488/