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Denture Displacement by Muscles — NDEB AFK MCQ

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HardProsthodonticsDenture Displacement by MusclesNDEB AFK

A complete denture patient complains that the lower denture moves during speech and eating. Which of the following muscles, if not properly accommodated by the denture flanges, is most likely causing this?

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

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Correct answer: D — Mentalis

The mentalis muscle originates from the mandible below the incisor roots and inserts into the chin skin. If the labial flange of the mandibular denture overextends into the mentalis muscle attachment area, contraction during lip movement dislodges the denture. The denture flange must be contoured to avoid impingement on this muscle. Similarly, the buccinator (laterally), mylohyoid (lingually), and modiolus area all require proper accommodation.

Reference: Zarb – Prosthodontic Treatment for Edentulous Patients, 13th ed., 2013