Articaine Versus Lidocaine Concentration in the Palatal Tissues After Supraperiosteal Buccal Infiltration Anesthesia

Abstract

Palatal local anesthetic injection is a painful procedure. Previous studies have reported successful extraction of maxillary teeth using only buccal infiltration of 4% articaine without palatal anesthesia. The aim of the present study was to determine levels of 4% articaine solution in palatal bone and mucosal tissues after buccal injection and compare those levels with 2% lidocaine solution in New Zealand white rabbits. Eight rabbits received 2 different injections of 0.6mL of 4% articaine with 1:100,000 epinephrine and 0.6mL of 2% lidocaine with 1:100,000 epinephrine buccal to the right and left maxillary first molar, respectively, in a split-mouth study design using quantitative syringes. All injections were administered using the buccal infiltration technique without any palatal injection. Ten minutes later, palatal bone and mucosa specimens were collected for analysis. Levels of the 2 local anesthetic agents were measured in palatal tissues using high-performance liquid chromatography (HPLC). HPLC analysis showed markedly higher 4% articaine solution values (0.319±0.037) in palatal mucosal tissues compared with palatal mucosal concentrations of 2% lidocaine solution (0.0839±0.017). In palatal bone, the mean concentration of 2% lidocaine solution was markedly lower than the mean concentration of 4% articaine solution (0.085±0.012 vs 0.155±0.012, respectively). There was no relevant difference between levels of 2% lidocaine in the palatal bone and mucosal tissues. However, the mean concentration of 4% articaine in the palatal mucosa was markedly higher than its concentration in palatal bone. The buccal vestibule-palatal diffusion of 4% articaine solution with 1:100,000 epinephrine is greater than 2% lidocaine solution with 1:100,000 epinephrine in a rabbit model.