Indirect Retention in RPD — NDEB AFK MCQ
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Correct answer: E — To resist rotational displacement of the distal extension base away from the residual ridge
Indirect retainers (typically rests placed on teeth distant from the fulcrum line) resist rotational displacement of the distal extension RPD base away from the residual ridge. When a sticky food pulls on the extension base, the RPD tends to rotate around the fulcrum line (imaginary line connecting the direct retainers). Indirect retainers placed anterior to the fulcrum line resist this rotation by acting as a lever in the opposite direction.
Reference: Carr – McCracken's Removable Partial Prosthodontics, 13th ed., 2015