<prompt> Which of the following regarding air abrasion is false?No tactile sensationIt can be a substitute for acid-etching techniqueCannot be used for cavity preparationAll of the above  <response>: Roughening by air abrasion by itself is not a substitute for acid-etching techniques. Roughening improves bonding. Acid etching alone or after roughening, however, always produces a better bond than air abrasion alone.Contemporary air abrasion equipment is helpful for stain removal, debriding pits and fissures before sealing and micromechanical roughening of surfaces to be bonded.Ref: Sturdevants art and science of operative dentistry. 4th edition page 328 