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RPD indirect retention — NDEB AFK MCQ

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ModerateProsthodonticsRPD indirect retentionNDEB AFK

A mandibular distal-extension removable partial denture rotates away from the tissues during sticky food. The rests and clasping near terminal abutments are adequate, but no anterior rest seats were prepared. What is the most likely cause/mechanism?

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Correct answer: B — Lack of indirect retention

A distal-extension RPD can rotate around the fulcrum line, and indirect retainers placed anterior to that line help resist lifting. Posterior palatal seal is a maxillary complete denture concept and does not explain mandibular distal-extension rotation. The pearl is to design RPDs around predictable movement under function.

Reference: NDEB prosthodontic reference texts; NDEB KSAs 2024