What should be done if the etched enamel becomes contaminated with saliva when seating enamel bonded restorations?

If etched enamel becomes contaminated with saliva during the process of seating enamel bonded restorations, the appropriate response is to re-etch the enamel. This step is critical because saliva can introduce contaminants that compromise the bond strength of the restorative material to the enamel surface. By re-etching for a specified duration, typically around 15 seconds, the original surface structure can be restored, effectively removing the contaminants and priming the surface for optimal bonding. After rinsing and drying the enamel, a bonding agent can then be applied, which will securely adhere to the now clean and freshly etched enamel.

Re-etching ensures that the enamel surface is properly prepared and minimizes the risk of bond failure, which can occur if the original bonding conditions are not adequately re-established after contamination. While other options may suggest alternative methods, they do not address the need to specifically re-etch the contaminated enamel.