PULPAL ANESTHESIA EFFICACY OF 4 LIDOCAINE SOLUTIONS INJECTED WITH AN INTRALIGAMENTARY SYRINGE

Four lidocaine solutions that differed in concentration or vasoconstri ctor composition were compared for efficacy of pulpal anesthesia. Thes e drugs were injected in a double-blind manner with the use of an intr aligamentary syringe to the periodontal ligament of maxillary lateral incisors. These teeth were subjected to electric pulp test stimulation that yielded absolute sensation threshold values. It was found that t here was no dose response relationship between the local anesthetic co ncentration and the efficacy of pulpal anesthesia. Lidocaine 2% with v asopressin 25 IU% and noradrenaline bitartrate produced a noticably sh orter duration of pulpal anesthesia in comparison with the other three drugs. The results indicated that the nature of vasoconstrictors when added to the local anesthetic can affect the efficacy of pulpal anest hesia using the intraligamentary mode.