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Prosthodontics & Occlusion · single question

For an RPD abutment tooth with significant bone loss and widened PDL, what design change best protects the tooth?

  1. Splint with adjacent tooth #21
  2. Remove the tooth from the design
  3. Change the rest from distal to mesial position
  4. Change from distal to palatal rest
Show answer and explanation

Correct answer: C. Change the rest from distal to mesial position

  • A. Splinting may help stability but is not the primary RPD design modification described.
  • B. Removing the tooth requires a completely different prosthetic plan.
  • C. Correct. Moving from a distal to a MESIAL rest changes the force direction on the compromised abutment — mesial rest directs forces toward the edentulous span more favorably and reduces tipping forces on the periodontally compromised tooth.
  • D. 'Palatal rest' is not a standard RPD design modification in this context.

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