ABSTRACT
Objective:To explore the changes of orthodontic therapy with tooth extraction on frontal view of facial soft tissue in adult females with Class Ⅱ division 1 malocclusion.Methods:Frontal view of facial soft tissue aesthetic charaeteristics of 30 with and 21 without tooth extraction adult females with Class Ⅱ division 1 malocclusion were measured with direct anthropometry before and after orthodontic treatment.Results:After the extraction treatment,the distance of N-Me,Sn-Me,Sn-UL,LL-Sm,Sto-Me,Ch-Ch in-creased(P 0.05).There was no sig-nificant change in each parameter in nonextraction group(P >0.05).Between the 2 groups Sn-UL,LL-Sm and UL-LL showed differ-ence(P 0.05).Conclusion:Orthodontic treatment with tooth for the fe-males with Class Ⅱ division 1 malocclusion can improve the incompetent lips,and recover the coordination between the upper and lower lips.There is little change on facial height and width.
ABSTRACT
Objective:To analyze and the smile line of Zhuang-Chinese youths.Methods:1 00 Zhuang volunteers aged 1 8-25 years were recruited for this study.The faces were individually registered by digital videography.The length and thickness of upper lips and mandibular incisor crown height appearance at rest,smile and laugh were recorded.Statistical analysis was performed using Mann-Whitney-U Test and non-parametric analysis.Results:The upper lip in men was longer than that in women at rest(P<0.05 ).The upper lip length increased and thickness decreased at smile and laugh in all subjects,in men was longer and thicker than in women(P<0.05),but there was no significant difference of upper lip thickness at rest between sexes(P<0.05).The mandibular anterior teeth,gingival papilla of all subjects were appeared at smile and laugh,there was no significant difference between sexes(P<0.05). Gingiva appearance at smile was in less than 1 0%of the subjects.39%subjects had high smile line,46%had average smile line and 1 5% had low smile line.Conclusion:Most of the Zhuang youths have moderate smile line,less high smile line and least low smile line.