Prosthodontics & Occlusion · single question
Where should the rest seat be placed on an abutment tooth requiring an Aker's (circumferential) clasp in a Kennedy Class III removable partial denture?
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Correct answer: A. Adjacent to (next to) the edentulous space
- A. Correct. The rest seat for an Aker's clasp in a Kennedy Class III (tooth-supported) RPD is placed ADJACENT TO (immediately next to) the edentulous space. This positioning directs occlusal forces through the rest into the abutment tooth along its long axis, minimizing lateral stresses on the clasp.
- B. Placing the rest on the occlusal center would not properly manage the direction of forces from the denture base.
- C. The most distal surface placement would not be adjacent to the edentulous space in a Class III scenario.
- D. Mesial surface only would be appropriate in specific clasp designs (like the RPI clasp), not the standard Aker's clasp.
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