Wound healing progress in rabbits over a period of 21 days. (A) Tramadol group, the average burn diameter measured .0cm. (B) Lidocaine group, burn diameter was 0.5 cm. (C) Remifentanil group. The average burn diameter measured 0.7 cm.(D) Remifentanil with gel group. The average burn diameter was 0.8 cm. (E) Remifentanil with epinephrine group, the burn showed an average burn diameter of 0.cm