Which statement describes active caries with surface discontinuity (Score 2)?

• A. Localized defect in enamel only. No undermined enamel or softened floor detectable with explorer.
• B. Extensively undermined enamel with softened floor.
• C. Surface is smooth and intact with no defect.
• D. Caries involving the pulp with tenderness on percussion.

Answer: (A)

The main idea is identifying an early, active caries that shows a break in the enamel surface without deeper involvement. The best description is a localized defect in enamel only, where the surface has a distinct discontinuity but there is no undermined enamel or softened floor detectable with a explorer. This fits active caries that has begun to breach the surface but hasn’t progressed to undermine the enamel or reach dentin.

The other scenarios point to different realities: a smooth, intact surface means no surface discontinuity; a situation with extensively undermined enamel and a softened floor suggests dentin involvement and a more advanced lesion; and a caries process involving the pulp with tenderness on percussion indicates irreversible pulpal Involvement.