What is the most common denture-related cause of gagging?

Correct answer: B. Distal over-extension of the mandibular denture

• A. Incorrect. Gagging is a normal reflex mediated by CN IX and X — nerve INJURY would abolish rather than cause it.
• B. Per the recall source. Over-extension of the denture border — particularly the distolingual flange into the retromylohyoid space — mechanically stimulates the pharyngeal reflex.
• C. Incorrect. Poor seal causes looseness and dislodgement, not primarily gagging.
• D. Strongly defensible alternative. The classic prosthodontic literature (Landa, JPD) identifies an exaggerated increase in OVD as the cause of persistent somatogenic gagging, resolving when OVD is reduced.

Note: ⚠️ CONTESTED — worth discussing as a group. The single most cited cause overall is over-extension of the POSTERIOR BORDER OF THE MAXILLARY DENTURE beyond the vibrating line (not offered here). Between the options given, both distal over-extension (mechanical/anatomic) and increased OVD (somatogenic) are supported in the literature. Know both.