Abstract: Objective to study the influence of gender on the evaluation of soft tissue profile in patients with skeletal Class II facial pattern. Methods from 2016 to 2020, 30 patients with skeletal Class II facial pattern in Jiangsu stomatological hospital were selected: 15 males and 15 females, aged 18-36 years. The natural head position silhouette photos of each patient before treatment were collected and CBCT was taken. Photoshop software was used to modify 30 photos to hide the hair, eyelashes, laryngeal nodes and other features that revealed gender characteristics. The same software was used to overlap CBCT synthetic lateral cephalograms with natural head position silhouettes to obtain lateral cephalograms with natural head positions. 30 silhouette photos without gender features and 30 silhouette photos without gender features (indicating gender) were randomly scrambled and made into slides, which were automatically played every 5 seconds. Invite non professionals to rate the two groups of slides respectively. The data were collected and sorted out, and the gender characteristic groups were divided into high group and low group. The holdaway analysis method was used to measure the indicators, and the independent sample t test was used to compare the differences among the indicators. Results the overall average score of the group without gender characteristics was lower than that of the group without gender characteristics (P < 0.05). The average score of male without gender characteristics group was lower than that of male without gender characteristics group (P < 0.05). The average score of women without gender characteristics group was lower than that of women without gender characteristics group (P < 0.05). In the group without gender characteristics, the score of male was higher than that of female (P < 0.05). The high score group and low score related measurement indicators were A-point convexity, upper lip base thickness, mentolabial groove depth, chin thickness (P < 0.05). Conclusion the gender of patients with skeletal Class II facial pattern has an impact on the evaluation of soft tissue profile. The aesthetic indexes affecting the evaluation of facial profile are A-point convexity, upper lip base thickness, mentolabial groove depth and chin thickness.　

Key words: Soft tissue profile evaluation, Gender, Skeletal Class II malocclusion