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Prosthodontics & Occlusion · single question

What is the function of the indirect retainer in a distal-extension removable partial denture?

  1. Prevent vertical displacement of the direct retainer
  2. Provide primary support for the denture base
  3. Prevent rotation of the distal-extension base away from the tissue
  4. Improve esthetics of the RPD framework
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Correct answer: C. Prevent rotation of the distal-extension base away from the tissue

  • A. Preventing vertical displacement (dislodgment) is the role of the direct retainer (clasp).
  • B. Primary support comes from rests on abutments and the residual ridge — not the indirect retainer.
  • C. CORRECT — The indirect retainer prevents rotation of the distal-extension denture base around the fulcrum line when a dislodging (sticky food) or functional force is applied. It is placed on the opposite side of the fulcrum line from the extension base.
  • D. Esthetics is not a function of the indirect retainer.

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