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Which muscle is responsible for the distal border of the mandibular flange of a denture?

Temporalis muscle

Masseter muscle

The masseter muscle plays a significant role in determining the distal border of the mandibular flange of a denture due to its anatomical position and function. This muscle is a primary muscle of mastication, involved in the elevation of the mandible, and it runs from the zygomatic arch to the angle of the mandible. Its positioning means that when establishing the contour of the mandibular denture, the distal border must be shaped to accommodate this muscle's action during chewing.

A correctly designed denture must consider the functional movement and boundary set by the masseter to ensure that it is well-retained and comfortable for the patient. Therefore, the contour that follows the masseter's action allows for effective chewing while minimizing the risk of discomfort or displacement of the denture during use. Understanding the interplay between the muscles of mastication and the fitting of the denture is essential in prosthodontics.

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Medial pterygoid muscle

Superior constrictor muscle

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