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Prosthodontics & Occlusion · single question

In a mandibular Kennedy Class I removable partial denture, the PRIMARY function of the lingual bar (major connector) is to:

  1. Provide rigidity, uniting components and distributing functional forces
  2. Provide direct retention of the prosthesis
  3. Serve as the primary support against vertical load
  4. Act as a rest seat on the abutment teeth
Show answer and explanation

Correct answer: A. Provide rigidity, uniting components and distributing functional forces

  • A. Correct. A major connector's chief role is rigidity — joining the framework into one unit and cross-arch distributing forces.
  • B. Incorrect. Direct retention is provided by clasps, not the major connector.
  • C. Incorrect. Vertical support comes mainly from rests on abutment teeth (and the residual ridge in a distal-extension case).
  • D. Incorrect. Rests, not the lingual bar, seat on the abutment teeth.

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