Anesthetic Efficacy of 1.8 Milliliters and 3.6 Milliliters of 2% Lidocaine with 1:100,000 Epinephrine for Posterior Superior Alveolar Nerve Blocks

Anesthetic success for the 1.8 mL volume of 2% lidocaine with 1:100,000 epinephrine was 97% for the second molar and 77% for the first molar. Anesthetic success for the 3.6 mL volume of 2% lidocaine with 1:100,000 epinephrine was 100% for the second molar and 84% for the first molar. The differences were not statistically significant between the 2 anesthetic volumes. Anesthetic success for the premolars for both volumes was in the low to moderate range and would not provide predictable pulpal anesthesia. For the first molar, the 3.6 mL volume of the lidocaine formulation provided a statistically longer duration of pulpal anesthesia than the 1.8 mL volume. The pain of depositing a 3.6 mL volume of a lidocaine solution was not statistically more painful than depositing a 1.8 mL volume.