Tooth 1.5 needs a crown, but subgingival caries extends to within 1 mm of the alveolar crest. What is the most appropriate treatment before the crown is made?
- Correct answer
Surgical crown lengthening with bone removal
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Placing the crown margin directly on the alveolar crest
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Gingivectomy alone
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Using a retraction cord to place the margin at the caries base
This question is one of 15 in AFK practice: Restorative, prosthodontics and implants. Test yourself on all of them.
Practice quiz FlashcardsExplanations
Placing a margin this close to bone encroaches on the supracrestal tissue attachment (biologic width, about 2 mm), causing chronic inflammation or bone loss. Crown lengthening with ostectomy restores space for this attachment; gingivectomy alone removes soft tissue but not bone.
Source: Newman and Carranza, Carranza's Clinical Periodontology — oneguy
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