Efficacy and Safety of Administration of Different Doses of 4% Articaine.

"The investigator will administer the first anesthesia for NDI block with a cartridge of 4% articaine anesthetic at 1:100,000 . At the end, an envelope containing the assignment to the experimental or control group will be opened.~In the control group, only the first anesthetic (1.8 mL of articaine 4% 1:100,000) will be injected and a second puncture will be simulated, contacting the syringe without the needle, in the same area, counting up to 30 seconds.~In the experimental group two anesthetic cartridges of articaine 4% 1:100,000 will be administered with the direct technique for the inferior alveolar nerve block."