Restorative & Materials · single question
Which problem is most directly caused by an under-extended denture flange?
Show answer and explanation
Correct answer: A. The denture dislodges/comes loose during functional movements such as puckering the lips, due to inadequate peripheral seal
An under-extended denture flange fails to achieve adequate peripheral seal/border contact with the surrounding soft tissue, reducing retention and allowing the denture to dislodge during functional movements like puckering the lips, smiling broadly, or speaking — the opposite of the better retention/seal a properly extended flange provides.
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