recommended for single rooted teeth and a drug volume of 0.9 ml is
recommended for multi-rooted teeth.
Removal of the needle from the ligament should be performed mid-way during
the aspiration cycle to prevent a back-spray of anesthetic solution into your
patient’s mouth. Since the injection is performed under pressure, if the needle is
otherwise removed, the patient’s mouth will be sprayed with bitter tasting
anesthesia. Therefore, the operator is advised to remove the needle during
aspiration, i.e. when the STA drive unit is retracting during aspiration.
Based on the auditory and visual pressure sensing feed-back, it is not unusual
for the operator to have to reposition the needle several times before locating the
proper position of the needle within the periodontal ligament. Additionally, slight
needle movements can result in rapid loss of pressure. The user will need to
withdraw and reposition the needle to establish an effective periodontal ligament
location.
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