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Prosthodontics & Occlusion · single question

Cingulum rest on the canine — how should it be positioned?

  1. U-shaped rest at approximately 1.5 mm from cingulum
  2. V-shaped rest directly on the incisal edge
  3. Placed subgingivally for retention
  4. Box-shaped rest with deep preparation into dentin
Show answer and explanation

Correct answer: A. U-shaped rest at approximately 1.5 mm from cingulum

  • A. Correct. A cingulum rest seat on a canine should be U-shaped (rounded, spoon-shaped) and positioned at approximately 1.5 mm from the cingulum, providing adequate thickness/strength without over-preparation.
  • B. A V-shaped design and placement on the incisal edge is inappropriate, risking inadequate strength and esthetic/functional issues.
  • C. Subgingival placement is not appropriate for a cingulum rest, which should remain supragingival on the lingual surface.
  • D. A deep box preparation into dentin is excessive and unnecessary for a properly designed cingulum rest seat.

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