Abstract: Objective: To analyze the preoperative data for the design of vermilion triangular flap, and evaluate the reconstruction effect by quantitative analysis of postoperative data in vermilion reconstruction in unilateral cleft lip. Methods: The measured data before and after operation in 26 cases of unilateral cleft were compared with the healthy side in the Department of Oral and Maxillofacial Surgery of the Affiliated Hospital of Qingdao University. The preoperative measured data included bilateral lip length, dry vermilion length, flap and bottom length of both cleft and non-cleft sides. The relationship of preoperative data were analyzed by medical statistics methods and used for designing the vermilion triangular flap. The postoperative measured data included lip length, dry vermilion and lip height of both cleft and non-cleft side. The correlation of the above data was analyzed by medical statistics method. The results of the designed vermilion triangular were evaluated from the subjective and objective aspects, including the shape and symmetry of lip vermilion. Results: There was a significant correlation between the degree of cleft lip fissure and the design of bottom length of vermilion triangular. The preoperative height difference was positively correlated with the bottom length of vermilion triangular (P＜0.05). The average scores for subjective evaluation items were more than four in all 26 cases. Objective evaluation of postoperative height of dry vermilion and lip in both cleft and non-cleft side showed no differences. Conclusion: The triangular vermilion flap designed in this paper can achieve satisfied upper lip vermilion in the unilateral cleft lip repair.

Key words: Unilateral cleft lip, Lip vermilion, Triangular vermilion flap