Here is another product I saw at the ADA. Its called a "Denjector". It automates the injection process. This gun type electric dental anesthetic injector may improve your ability to administer anesthetic to a patient, can make difficult injections easier for the dentist and reduce discomfort for the patient.
The battery powered injector ensures stable anesthesia delivery through its programmed injection speeds to minimize injection discomfort for the patient. Should be around $1000 after it receives FDA approval.