Rebolledo AS et al and Berlin J. et. al are comparing the efficacy of the two anesthetics 4% articaine and 2% lidocaine. They want to know the most efficient anesthetic suitable for the procedure.
The methodology by Berlin J. et. al is using a computer-controlled local anesthetic delivery system to deliver a primary intra-ligament injection of the articaine and lidocaine; while study of Rebolledo AS et al had two operators that were in second and third course of the Master of Oral Surgery and Implantology manually injected the anesthetics in the area of the inferior nerve during extraction of implanted lower third molars. Berlin J. et. al were also contrasting the success rate in anesthesia induction between the prior study with a high-pressure syringe and computer-controlled anesthetic delivery system(Jeffrey Berlin DDS, 2005).
In locoregional anesthetic techniques, among the most widely used is the truncal block of the inferior alveolar nerve. Determination of the most effective anesthetic for the said procedure would be good to the patient, for he will not feel the pain of the tooth extraction longer; and the doctor, for he can to do the surgery effectively(Alejandro Sierra Rebolledo 2007). Results of both of the study indicate that there were no significant anesthetic efficacy difference between 4% articain and 2% lidocaine. Either of these anesthetics can be used and expect the same effectiveness. It is noted though that 4% articaine is better based on the anesthetic effect duration and latency.
Though the efficacy of the 4% articain and 2% lidocaine are same in level, further studies can be done to determine the cause of paraesthesia that was seen in the two of the patients in excluded in the study due to articain.
References Alejandro Sierra Rebolledo , E. D. M., Leonardo Berini Aytés , Cosme Gay Escoda. (2007). Comparative study of the anesthetic efficacy of 4% articaine versus 2% lidocaine in inferior alveolar nerve block during surgical extraction of impacted lower third molars Med Oral Patol Oral Cir Bucal 12:E, 139-144.
Jeffrey Berlin DDS, M., John Nusstein DDS, MSb. (2005). Efficacy of articaine and lidocainenext term in previous terma primary intraligamentary injection administered with a computer-controlled local anesthetic delivery systemnext term. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology 99(3), 361-366.