The analysis plan is based on the primary outcome of mean pain score during lidocaine infiltration as measured on the 0 mm to 100 mm VAS. The investigators are comparing two groups: 1) buffered lidocaine 2) non-buffered lidocaine. If the data are normally distributed, we will compare mean pain scores between the two groups using a t-test. If the data deviate notably from normality, the nonparametric Wilcoxon rank sum test will be used for comparisons. Imbalances will be handled by adjustment for covariates in multiple linear regression. The investigators will use an intention to treat analysis.