If a tooth is contaminated with moisture after acid etching, what should be done next?

When a tooth is contaminated with moisture after acid etching, re-etching for an additional 10-20 seconds is the appropriate action. The purpose of acid etching is to create a rough surface on the enamel or dentin that enhances the bonding strength of the subsequent materials applied during restorative procedures. However, if the tooth becomes contaminated with moisture, it can interfere with the bonding process, leading to compromised adhesion and potential treatment failure.

Re-etching allows the removal of the contaminated surface layer, helping to restore the necessary characteristics of the enamel or dentin for effective bonding. This step ensures that the etched surface is clean and free from moisture, which is crucial for the bonding agent to properly adhere to the tooth structure.

This approach prioritizes the integrity of the bond and the longevity of the restoration, making re-etching an essential step in maintaining the quality of dental work after contamination has occurred.