The upper denture falls when the patient opens his mouth wide. This is due to:

  # The upper denture falls when the patient opens his mouth wide. This is due to:

A. Thick labial flange

B. Over extended borders

C. Thick distobuccal flange

D. Poor peripheral seal

The correct answer is C. Thick distobuccal flange

The thickness of distobuccal flange of maxillary denture must be adjusted to accommodate the ramus, coronoid process and the masseter. If the flange is too thick, the coronoid process will push the denture out of place during opening or lateral movements of mandible.

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