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目的探讨安氏Ⅲ类错畸形中平面与前牙覆的相关性,通过控制平面的变化为不同前牙覆安氏Ⅲ类错患者的正畸、正颌治疗提供策略依据。方法选取90例安氏Ⅲ类前牙反成人正畸患者治疗前的头颅侧位片作为试验组,同时选取30例成人个别正常的头颅侧位片作为对照组。根据前牙覆的大小将安氏Ⅲ类错分为3组,即开组、反覆组、反深覆组,每组各测量14项指标。对各组间的差异进行方差分析和多重比较分析,同时对前牙覆与前后平面的相关性进行直线相关分析。结果安氏Ⅲ类错中后牙平面倾斜度(OP-P角)和前牙覆呈负相关(r=-0.24,P<0.05),前牙平面倾斜度(OP-A角)与前牙覆呈正相关(r=0.23,P<0.05)。结论不同前牙覆的平面形态各有不同,在正畸治疗不同前牙覆安氏Ⅲ类错时,应重视后牙垂直高度的控制及后牙平面的倾斜度改变。
Objective To investigate the correlation between the plane and the anterior mandibular covering in Class Ⅲ malocclusion and to provide the basis for the orthodontic and orthognathic treatment by controlling the change of diagonal plane in patients with different malocclusion of Angle Ⅲ malocclusion. Methods Totally 90 adult patients with Angle Ⅲ anterior inverted inverted orthopedic adult orthodontic patients were selected as experimental group and 30 normal individual cephalometric slices were selected as control group. According to the size of the anterior lamina, Class Ⅲ malocclusions were divided into 3 groups: open group, repeated group and reverse dark group. Each group measured 14 indexes. The differences between groups were analyzed by ANOVA and multiple comparisons, and the linear correlations between the anterior and posterior plaques were analyzed. Results There was a negative correlation between the angle of OP-P and the thickness of anterior lamina in Angle Ⅲ malocclusion (r = -0.24, P <0.05) And anterior lamina was positively correlated (r = 0.23, P <0.05). Conclusions Plane morphology varies with different anterior teeth. When orthodontic treatment of Angle 氏 Ⅲ malocclusion, it should pay attention to the control of posterior vertical height and the inclination of posterior plane.