Prosthodontics & Occlusion · single question
What is the primary function of the indirect retainer in a distal-extension removable partial denture?
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Correct answer: A. Prevents the distal extension base from rotating away from the tissues
The indirect retainer resists the rotational displacement (lifting away) of the distal extension base by acting as a counterbalance on the opposite side of the fulcrum line. When occlusal forces or gravity tend to lift the free-end saddle, the indirect retainer — seated on a tooth anterior to the fulcrum line — presses against its rest seat, leveraging resistance to this rotation. The effectiveness of the indirect retainer increases with its distance from the fulcrum line.
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