In which of the following situations can air abrasion not be used?
Although promoted for caries excavation, air abrasion is not able to produce well-defined preparation wall and margin details that are possible with conventional rotary cutting techniques.
Ref: Sturdevant's art and science of operative dentistry. 4th edition page 328
Caries excavation
Debriding pits and fissures
Cavity preparation
Stain removal