Performing the STA-Intraligamentary Injection
1. Turn the STA drive unit to “On”. The system will default to the STA mode.
2. Load and attach the STA bonded handpiece with the pre-attached bonded
30 gauge ½ inch needle and the appropriate anesthetic. The unit will
automatically purge the air from the system. Rest the handpiece in the
cap holder.
3. While holding the STA handpiece in a pen-like grasp, place the needle
into the gingival sulcus of the tooth to be anesthetized. Simultaneously,
activate the ControlFlo™ rate by depressing the foot control. It is
important to gently and slowly advance the needle within the sulcus, as if it
were a periodontal probe. It is highly recommended that the clinician use
a finger rest to control and stabilize needle movements.
4. The STA System provides a continuous audible and visual feedback to
guide the needle tip to the periodontal ligament. As the foot control is
depressed, the device initially will say “sensing”. The user will then hear
the word “Cruise” at which time the cruise control function can be engaged
by removing one’s foot from the pedal.
5. In the STA mode, the DPS technology provides real time pressure
feedback via:
a. The visual Pressure Sensing Scale (Gauge) comprised of a series of
orange, yellow and green LED lights. The orange LED’s indicate
minimal pressure, the yellow LED indicate mild pressure and the
green LED’s indicate moderate pressures indicative of the
periodontal ligament tissue.
b. The auditory Pressure Sensing Scale is composed of a series of
triple ascending tones “beep, beep, beep”. Increasing pressure is
indicated by the triple ascending sequence. When the periodontal
ligament is identified, the user will hear the letters “PDL” spoken
three times, followed by a series of extended tones “beeeep, beeeep”
indicating correct needle positioning.
Fig. 13
Note: It is typically found when performing the STA-Intraligamentary injection
that it is often necessary to relocate the needle tip to find the periodontal ligament
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