骨性Ⅱ类错成人与少年治疗前、后牙变化的对比

Comparison of dental changes between adult and adolescent skeletal class Ⅱ malocclusion

目的:对比少年与成人骨性Ⅱ类均角安氏Ⅱ1错患者治疗前后牙变化的异同。方法:选择女性少年与成人骨性Ⅱ类均角安氏Ⅱ1错患者各30例,两组治疗方法以及疗程均相互匹配,通过对比两组患者治疗前、后的头颅侧位片,分析其治疗前、后牙关系变化的异同,统计学分析方法采用配对t检验。结果:治疗后少年组与成人组上切牙均直立及伸长,少年组上磨牙前移并伸长,成人组则上磨牙仅前移而无伸长,治疗后两组下切牙均远中移动,但唇倾度均无明显变化,成人组下切牙垂直向压低多于少年组,少年组下磨牙的前移及伸长均多于成人组,治疗后成人组较少年组有更多的上、下平面顺时针旋转。结论:生长发育有利于骨性Ⅱ类均角患者深覆的矫治。

Objective： To compare occlusual changes after orthodontic treatment between adults＇ and adolescents＇ skeletal class Ⅱ malocclusion with average mandible plane angle.Methods： In the study,30 adolescent girls and 30 women who had skeletal class Ⅱ and Angle class Ⅱ,division 1 malocclusions were selected.The two groups were matched by sex,treatment period and method.Cephalometric radiographs taken before and after treatment were traced and measured.Student＇s t-test was used.Results： After treatment upper incisors retracted and erupted in both groups.Upper molars moved forward and downward in the adolescents but only moved forward in the adults.Lower incisors retracted but their inclination remained constant in both groups.More intrusion of lower incisors was shown in the adults.Lower molars showed more forward and upward movement in the adolescents than in the adults.The adults experienced more clockwise rotation of occlusion plane than the adolescents.Conclusion： Growth enhances the correction of deepbite in adolescent skeletal class Ⅱ malocclusion.