system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
In which of the following situations can air abrasion not be used?
assistant
The correct answer is  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