In what situation should you repeat the etching step of sealant application?

Repeating the etching step of sealant application is crucial when there is saliva contamination. During the sealant application process, saliva can introduce moisture to the tooth surface, which can hinder the adhesion of the sealant to the enamel. The etching process creates a rough surface on the tooth’s enamel, enhancing the bond between the tooth and the sealant. If saliva contaminates this surface after etching, it is necessary to re-etch to ensure that the surface is free of saliva, thus promoting better adhesion and ensuring the effectiveness of the sealant.

When considering other situations, a tooth may feel clean, but if it has been contaminated with saliva, it won’t bond effectively regardless of cleanliness. A high incidence of caries indicates the need for preventive measures but does not directly necessitate a repeat of the etching step unless contamination occurs. Observing decay signals a need for treatment, but it does not specifically warrant a repeat of the etching process unless contamination is present as well. Therefore, focusing on maintaining a clean, dry surface is key in sealant application, making repeat etching following saliva contamination the correct action.