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Secondary caries at restoration margin — NDEB AFK MCQ

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EasyRestorativeSecondary caries at restoration marginNDEB AFK

A 33-year-old has a rough open margin on an old Class II restoration on tooth 2.6. Bitewing shows radiolucency under the gingival margin, and floss catches consistently. What is the most likely diagnosis?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: C — Secondary caries at restoration margin

A defective restoration margin with radiolucency and floss catching is most consistent with secondary caries. External apical resorption would be located at the root apex and would not be explained by an open proximal restoration margin. The pearl is that marginal integrity, plaque control, and caries risk should be assessed before choosing repair or replacement.

Reference: Restorative dentistry reference texts; NDEB KSAs 2024