关键词: 唇部软组织, 软组织测量, 安氏Ⅱ类1分类错牙合

Abstract: Objective Lip soft tissue were measured and assessed before and after orthodontic treatment of Class Ⅱ division 1 adults in order to instruct the clinical work. Methods A total of 30 post-treatment adult patients of Class Ⅱ division 1 were selected, whose post-treatment model and cephalometric data were within the normal range. The pre- and post-treatment front image and lateral cephalograms lip sagittal thickness and vertical thickness measurement. Results Post-treatment upper lip vertical become thinner and lower lip vertical thickness is bigger which has a statistically significant gap. Upper lip vermilion of the initial tissue thickness after treatment increased, lower lip vermilion of initial tissue thickness had a tendency to decrease after treatment, and there was statistical significance. The retraction of upper incisor cervical point (U1C) was positively correlated with upper lip retraction (TUL). The retraction of lower incisor cervical point (L1C) was positively correlated with lower lip retraction (TLL). And the retraction of upper incisor most anterior point was positively correlated with lower lip retraction. Conclusion Upper and lower lip retraction in Class Ⅱ division 1 Chinese adults could be effectively predicted by the retraction of incisors after extraction orthodontic treatment.

Key words: Facial proportions, Soft tissue measurement, Angle Class Ⅱ division 1 malocclusicn