Wound healing process in rabbits at the 14-day. The (A) Lidocaine group the average burn diameter was 1.80cm (B) Tramadol group, resulting in an average burn diameter of 2.80cm. (C) Remifentanil group ,the average burn diameter was 2.6 cm (D) Remifentanil with gel group , resulting in an average burn diameter of 1.5cm (E) Remifentanil with epinephrine the burned skin had an average diameter of 1.6 cm.