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Inferior alveolar nerve block anatomy — NDEB AFK MCQ

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EasyBiomedical SciencesInferior alveolar nerve block anatomyNDEB AFK

A patient receives an inferior alveolar nerve block and reports numbness of the lower lip but persistent lingual soft tissue sensation. The mandibular teeth are anaesthetised. What is the most likely cause/mechanism?

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

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Correct answer: E — Lingual nerve was not adequately anaesthetised

Lower lip numbness indicates inferior alveolar or mental nerve anaesthesia, but persistent lingual soft tissue sensation suggests insufficient lingual nerve anaesthesia. The long buccal nerve supplies buccal soft tissues of mandibular molars, not pulps. The pearl is to test the tissues relevant to the planned procedure rather than relying on lip numbness alone.

Reference: Dental anatomy/local anaesthesia reference texts; NDEB KSAs 2024