# Which of these muscles may affect the borders of mandibular complete denture?
A. Mentalis
B. Lateral pterygoid
C. Orbicularis oris
D. Levator angularis
The correct answer is A. Mentalis.
The labial vestibule extends from the labial frenum to the buccal frenum. The mucolabial fold extends from the inner aspect of the lip to the mandible. The mentalis muscle inserts very close to the crest of the ridge in this area and limits the border extension in length and width.
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