Crown Lengthening Indications — NDEB AFK MCQ
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Correct answer: B — To increase the ferrule effect for a subgingival margin on a tooth requiring a crown
Crown lengthening (osseous/soft tissue surgery) is indicated when the restorative margin is subgingival and violates the biological width (supracrestal tissue attachment), or when inadequate ferrule (<1.5-2 mm) exists for a crown preparation. The procedure removes bone and soft tissue apically to expose additional tooth structure. The minimum post-operative distance from the restorative margin to the alveolar crest should be approximately 3 mm to accommodate the biological width and sulcus depth.
Reference: Newman – Newman and Carranza's Clinical Periodontology, 13th ed., 2019