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Mentalis and Denture Design — NDEB AFK MCQ

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ModerateProsthodonticsMentalis and Denture DesignNDEB AFK

Which anatomical landmark limits the depth of the vestibular sulcus in the mandibular anterior region and must be accounted for in complete denture fabrication?

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Correct answer: B — Mentalis muscle insertion

The mentalis muscle originates from the incisive fossa of the mandible and inserts into the chin skin. Its attachment limits the depth of the anterior labial vestibule. Over-extension of the mandibular denture labial flange into this area results in denture instability during lower lip and chin movements. Proper border moulding must capture the functional depth of the sulcus, accounting for mentalis activity.

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