cephalometric measurements closely associated with the facial profile esthetics of skeletal Class Ⅲ malocclusion after treatment
Esthetic degrees of each Class Ⅲ patients’ facial profiles after surgical-orthodontic or camouflage treatment were different,some cephalometric measurements may be correlated with the degree of profile esthetics in skeletal Class Ⅲ malocclusion.Esthetic degrees of 237 Class Ⅲ patients’ facial profiles after surgical-orthodontic or camouflage treatment were evaluated by 9 orthodontists. We defined the top and bottom 40 patients posttreatment for esthetics as the high-score and low-score groups, respectively,to analyze the differences in 22 between the groups. Logistic regression analysis was performed for the measurements with significant differences between the groups to determine which is correlated with the profile esthetic degree
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A total of 237 skeletal Class Ⅲ patients fromthe China Medical University College of Stomatology were enrolled in this retrospective study from 2012 to 2017. The inclusion criteria were as follows:Skeletal Class Ⅲ malocclusion with an ANB angle less than 0°before treatment; A silhouette and photo of each patient’s facial profile before or after treatment were placed in the same slide, and all patients’ slides were assembled into a Microsoft PowerPoint file. The Microsoft PowerPoint slides showing the facial profile were displayed on the computer screen sequentially at 10-s intervals. A group of nine orthodontists from the China Medical University School of Stomatology who had over 10 years of experience were invited as profile esthetic evaluators.The nine evaluators were positioned at 0.5m in front of the screen and allocated a score to each patient’s profile. Before the evaluation began, the evaluators were told that they would see 237 skeletal Class Ⅲ malocclusion patients’ facial profile silhouettes and photos. Each evaluator was asked to rate each patient’s profile esthetic on a scale from one to ten with the corresponding options. Each patient’s mean±standard deviation (SD) esthetic score was calculated. The esthetic degree and ANB angle between pretreatment and posttreatment in the camouflage group and the surgical-orthodontic group were compared.The pretreatment and posttreatment esthetic degree and ANB angle were compared between the camouflage group and the surgical-orthodontic group.The 40 patients with the highest scores and the 40 patients with the lowest scores were defined as the high-score and low-score groups, respectively. Six skeletal cephalometric measurements, eight dental cephalometric measurements, and eight soft tissue cephalometric measurements for the two groups’ patients after treatment were investigated on the lateral cephalograms using the Winceph 8.0 software;the cephalometric measurements between the two groups were compared. Correlation between the measurements having significant differences in the two groups and the esthetic degree of their profile were analyzed through correlation regression analysis.