When is a sealant contraindicated?
A) When there is incipient caries on the occlusal surfaces
B) When there is a presence of a large occlusal restoration
C) When there is dark staining in the pits and fissure
D) When there is a high caries rate
B
Explanation: B) A dental sealant is contraindicated if: patient behavior does NOT permit use of dry-field techniques throughout the procedure, an open, frank, carious lesion exists on the same tooth, caries exist on other surfaces of the same tooth in which restoration will disrupt an intact sealant, and a large occlusal restoration is already present.
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