INBDE (Integrated National Board Dental Examination) Practice Exam

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What muscle limits the labial vestibule flange on mandible inferiorly?

Mentalis
Buccinator
Masseter
Lateral pterygoid

The correct answer is: Mentalis

The muscle that limits the labial vestibule flange on the mandible inferiorly is the Mentalis muscle. The Mentalis muscle is located at the lower jaw and plays a role in controlling the movement of the lower lip and chin. It is responsible for actions such as lip protrusion and wrinkling of the chin. In the context of limiting the labial vestibule flange on the mandible inferiorly, the Mentalis muscle helps maintain the shape and position of the lower lip and contributes to the overall oral function and esthetics. The other options listed are not correct in this context: - The Buccinator muscle is primarily responsible for compressing the cheeks against the teeth during chewing. - The Masseter muscle is a powerful muscle that elevates the mandible during chewing. - The Lateral pterygoid muscle is involved in depressing and protracting the mandible, as well as in side-to-side movements of the jaw.