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Prosthodontics & Occlusion · single question

Which Kennedy classification does NOT require an indirect retainer in a removable partial denture design?

  1. Kennedy Class II (unilateral distal extension)
  2. Kennedy Class III (bounded edentulous space)
  3. Kennedy Class IV (single bounded anterior space)
  4. Kennedy Class I (bilateral distal extension)
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Correct answer: B. Kennedy Class III (bounded edentulous space)

  • A. Kennedy Class II (unilateral distal extension) also requires an indirect retainer on the extension side.
  • B. Correct. Kennedy Class III is a bounded (tooth-supported) space — there are teeth both anterior and posterior to the edentulous area. Since the RPD is fully tooth-supported (not tissue-supported at the distal end), there is no rotational tendency and NO indirect retainer is needed.
  • C. Kennedy Class IV is an anterior bounded space that also does not require an indirect retainer, but Class III is the more commonly tested answer.
  • D. Kennedy Class I always requires indirect retainers — bilateral distal extensions need them to prevent rotation.

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