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Prosthodontics & Occlusion · single question

In RPD (removable partial denture) design, when do you use a ring clasp?

  1. When the patient has parafunctional habits
  2. When there is a mesial undercut on a molar
  3. When maximum retention is needed on premolars
  4. When the tooth has a distal or distobuccal undercut on a molar
Show answer and explanation

Correct answer: D. When the tooth has a distal or distobuccal undercut on a molar

  • A. INCORRECT — Clasp selection is based on undercut location and tooth morphology, not parafunctional habits.
  • B. INCORRECT — Mesial undercuts on molars are typically engaged by circumferential clasps approaching from the mesial aspect.
  • C. INCORRECT — Ring clasps are not the clasp of choice for premolars; Akers (circumferential), back-action, or RPI clasps are more appropriate.
  • D. CORRECT — A ring clasp (or ring/encircling clasp) is specifically used for lone-standing molars with mesially tilted positions where the undercut is on the distobuccal surface. The clasp encircles nearly the entire tooth to access the undercut from the distal side.

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