tissues. The operator should not be concerned that it may take several attempts
to find the optimal location. Using DPS™ technology, the user can be confident
that the optimal location has been identified
The continuous DPS™ technology provides the user with important on-going
information that the needle has not moved from the optimal location during the
entire injection process. The DPS™ feedback will also alert the operator to the
proper hand pressure applied to the handpiece. Excessive pressure can result in
“blockage” of flow of anesthetic solution. This will be detected and result in an
“over pressure” condition.
Excessive buildup of pressure will result in a “Over-pressure” condition, and
sound the i the over pressure alarm... The user will need to release the foot
control or stop cruise control. The user will then need to restart the injection
moving the needle to a new location. The unit’s maximum generated pressure is
450 psi ± 10%. The maximum infusion pressure will not exceed 500 PSI.
Note: It is not unusual to experience an over-pressure condition. This may occur
as a result of excessive hand pressure on the STA-Wand™ handpiece. It may
also result from a blockage or clogging of the needle. In either situation, the
needle must be relocated. If the overpressure situation persists, remove the
needle from the patient’s mouth to determine if the needle is “blocked” or
“clogged”. If the needle is clogged it will need to be replaced prior to reuse.
Note: The operator may test for an over-pressure condition by occluding a
needle and using the STA mode. The pressure will build in the STA mode and
the alarm will sound.
Dosage Volume
The STA System allows for a virtually unlimited amount of anesthetic to be
deposited. The operator should use his/her own judgment as the anesthetic drug
selection and the volumes used. The following are suggestions and clinicians are
encouraged to reference the appropriate drug manufacturers, current dental
literature and textbooks for recommended dosages and drug recommendations.
a. A drug volume of 0.9 ml is recommended for single rooted teeth.
b. A drug volume of 1.8 ml is recommended for multi-rooted teeth.
c. The use of local anesthetics containing a vasoconstrictor concentration of
1:50,000 parts is not recommended for an Intraligamentary injection.
d. When using local anesthetics concentrated at 4% (Articaine Hydrochloride
4% and Prilocaine Hydrochloride 4%), a drug volume of 0.4 ml is
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