Question 19 of 35

That is right.

The thumb ring on the syringe must be pulled back from 1 - 2 mm for a reliable aspiration.

This will create negative pressure inside the cartridge which will draw whatever is lying at the needle tip into the cartridge. The clinician is to be observing whether blood enters the cartridge during aspiration, indicating a positive aspiration. If that occurs, local anesthetic solution should not be given at that site.