Prosthodontics & Occlusion · single question
Where should the margin of a crown preparation ideally be placed?
Show answer and explanation
Correct answer: C. Supragingival
- A. Encroaching on the junctional epithelium produces persistent inflammation.
- B. Subgingival placement is used only when esthetics, caries extent or retention demand it, and always with respect for biologic width.
- C. Correct. Supragingival margins are more accessible for finish-line control, impression making, cementation cleanup and daily hygiene — and they show significantly less associated gingival inflammation.
- D. A margin at the crestal bone violates the biologic width and reliably causes chronic inflammation and bone loss.
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