RPD Review Questions

Answer to Question #75


The correct answer is

Incorrect. The buccinator muscle is a relatively weak muscle and its fibers run anterior-posteriorly. It has very little if any effect on the shape of the distobuccal corner of the denture base.

Correct. The masseter muscle is a powerful muscle whose fibers run more or less superiorly-inferiorly. Upon contraction, it pushes the buccinator muscle and other tissues into the distobuccal corner of the denture base.

Incorrect. The internal pterygoid muscle has no effect on the distobuccal corner of the mandibular denture base.

Incorrect. The mylohyoid muscle has no effect on the buccal aspect of the denture base.