The mean VAS scores were 2.08 ( SD , 0.62 ) in the lidocaine group , 2.21 ( SD , 0.66 ) in the prilocaine group , 3.92 ( SD , 0.58 ) in the ropivacaine group , 4.15 ( SD , 0.64 ) in the bupivacaine group , and 6.35 ( SD , 0.65 ) in the saline solution group .