Which structure of the MAXILLARY denture will interfere with the patient's functional mandibular movements?

Correct answer: B. Width of the posterior buccal flanges

• A. While anterior tooth position affects phonetics and esthetics, it is the posterior buccal flanges that most commonly interfere with functional mandibular movements like lateral excursions and chewing.
• B. The POSTERIOR BUCCAL FLANGES of the maxillary complete denture can interfere with functional mandibular movements if they extend too far into the buccinator mechanism. The buccinator muscle and masseter muscle attachments in the buccal vestibule require adequate space. Overextended posterior buccal flanges cause instability of the denture during function (chewing, talking).
• C. Palatal thickness affects phonetics and comfort — but it is the lateral flanges that interfere with functional jaw movements.
• D. The posterior palatal seal (post-dam area) provides retention — it is not the primary source of interference with mandibular movements.