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Crown Margin Placement — NDEB AFK MCQ

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ModerateRestorative DentistryCrown Margin PlacementNDEB AFK

When a tooth is prepared for a ceramic crown and the preparation margin is placed equigingivally, what is the risk compared to a supragingival margin?

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Correct answer: B — Increased risk of gingival inflammation and attachment loss due to biofilm accumulation at the subgingival margin

Subgingival and equigingival crown margins are associated with increased plaque accumulation, gingival inflammation, and risk of periodontal attachment loss compared to supragingival margins. The sulcular environment makes oral hygiene more difficult and margins harder to finish accurately. Supragingival margins are preferred whenever aesthetics allow. When subgingival margins are necessary (aesthetics, caries, retention), they should be kept as shallow as possible (0.5 mm intrasulcular).

Reference: Newman – Newman and Carranza's Clinical Periodontology, 13th ed., 2019