Average healing time
The average healing time was 43.72 days (range, 20–60 days, standard deviation = 10.99) in the endoscopic subgroup and in the microscopic subgroup,43.99 days (range, 21–56 days, standard deviation = 10.27). However, there is no obvious difference in the experimental data. The comparative data is the healing time of the two methods. (P =0.262).