TECHNIQUE
The STA - Great for the P-ASA Injection
The STA Injection System (Figure 1) is not only great for single tooth
anesthesia, but is also very useful to administer multiple tooth
injections such as the palatal approach anterior superior alveolar
nerve block (P-ASA). The P-ASA is a single-site palatal injection,
into the nasopalatine canal, which can produce bilateral anesthesia
to six anterior teeth and the related facial and palatal gingival
tissues (Figure 2), without causing collateral numbness to the
patient's upper lip, face and muscles of facial expression (Figure 3)
Patients really appreciate this!
Using significantly less anesthetic, this easy-to-administer injection
can take the place of at least four supraperiosteal buccal infiltrations
and a palatal injection. It is valuable for cosmetic restorative
dentistry procedures such as composites, veneers, and crowns
because you can immediately assess the patient's smile line when
the lip is used as a reference point. The P-ASA is also useful for
endodontic, periodontal and implant procedures. In fact, it is
recommended as the primary injection for the six maxillary anterior
teeth.
During administration and postoperatively, the P-ASA is a very
comfortable injection for your patients due to the STA flow rate
below the patient's pain threshold and the ability to easily control
the needle. Check out the simple injection technique for the P-ASA
below and more on the P-ASA on the STAis4U.com web site.
It's easy to do. Try it; you'll like it! And so will your patients!
For more information, contact:
Milestone Scientific, Inc.
(800-862-1125)
Milestonescientific.com
Clinical Injection Technique
1. Keep the STA at the STA mode.
2. Place the bevel of the 30G ½" needle on the injection site, 1mm lateral to the incisive
papilla, (Figure 4) with the needle at about a 45 degree angle and apply pressure to the
back of the needle and tissue with a cotton tip applicator (Figure 5).
3. After setting the system on Cruise Control, continue to administer the anesthetic at the
ControlFlo rate for about 8-10 seconds. Then slowly rotate the needle to pierce the tissue.
4. Allow the anesthetic to enter the tissue for 5-6 seconds. When the incisive papilla is
blanched (Figure 6), rotate the needle vertically.
5. Every 4 to 5 seconds slowly advance the needle about 1mm, creating an anesthetic
pathway, (Figure 7) until you reach the injection site: the internal wall of the Nasal Palatine
Canal or ½ of the length of the needle (Figure 8).
6. After a negative aspiration, administer the appropriate amount of anesthetic.
(Approximately 3/4 to a full cartridge for adults and between ¼ to ½ for a child - using 2%
Lidocaine 1:100,000) ½ the dosage when using 4% Articaine (Septocaine or Citanest
1:200,000)
7. Once you have administered the desired amount of anesthetic wait for about 6 seconds
and slowly back the needle out of the tissue, or withdraw the needle during the aspiration
cycle.
Eugene R. Casagrande, DDS
Director of International & Professional Relations, Milestone Scientific
Figure 1. STA System
Figure 2. Scope of Anesthesia
Figure 3. Collateral Numbness
Figure 4. P-ASA Injection Site
Figure 5. Pre-Puncture Technique
Figure 6. Blanched Incisive Papilla
Figure 7. Anesthetic Pathway
Figure 8. Incisive Canal Site