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Impression tray impingement — NDEB AFK MCQ

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HardProsthodonticsImpression tray impingementNDEB AFK

A complete denture impression produces an overextended mandibular lingual flange. At insertion, the patient has pain during tongue movement and the denture lifts when the tongue is protruded. What is the most likely cause/mechanism?

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Correct answer: C — Overextension into functional lingual sulcus

Pain and denture displacement during tongue movement indicate overextension of the mandibular lingual flange into the functional sulcus. Posterior palatal seal relates to maxillary retention, not mandibular tongue movement. The pearl is that border moulding must capture dynamic muscle and tongue activity.

Reference: NDEB prosthodontic reference texts; NDEB KSAs 2024