Mental Foramen — MFDS Part 1 MCQ

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EasyAnatomy (Head & Neck)Mental ForamenMFDS Part 1

On the external surface of the mandible, when the mental foramen is vertically aligned with a tooth, it is most commonly in line with the long axis of which mandibular tooth?

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Correct answer: E — Second premolar

The correct answer is E, the mandibular second premolar. When the mental foramen is aligned with an individual tooth, its most frequent relationship is with the long axis of the second premolar. It transmits the mental nerve and accompanying vessels onto the external surface of the mandible. The first premolar is too anterior, although the foramen may lie between the first and second premolars; this anatomical variation made the original wording imprecise. The first molar is generally posterior to the usual location. The canine and lateral incisor are substantially anterior and are not typical landmarks for the mental foramen. Clinically, variation must be considered when planning local anaesthesia or surgery in the premolar region.

Reference: Barbosa DAF et al. Mental Foramen and Anterior Loop Anatomic Characteristics: A Systematic Review and Meta-analysis of Cross-sectional Imaging Studies. Journal of Endodontics. 2021;47(12):1829-1843.e1. https://pubmed.ncbi.nlm.nih.gov/34425149/