前牙覆对安氏Ⅲ类错平面的影响

Occlusal planes of Angle's class Ⅲ malocclusion impact by anterior overbite

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 Angle’s class Ⅲ patients’ occlusion plane and anterior overbite by controlling the changes in occlusion plane during orthodontic treatment. Methods In total, 90 Angle’s class Ⅲ adult orthodontic patients were selected as the experimental group, and 30 normal adults were selected as the control group. According to the overbite, the class Ⅲ patients were divided into three groups, and 14 indicators were measured. ANOVA and multiple comparison analysis were used to analyze the difference between class Ⅲ patients, and linear analysis was used to analyze the correlation between anterior overbite and anterior-posterior occlusion plane. Results In class Ⅲ patients, posterior occlusion plane and anterior overbite size were negatively correlated （r=-0.24, P〈0.05）, whereas anterior occlusal plane and anterior overbite size were positive correlated （r=0.23, P〈0.05）. Conclusion The shape of the occlusion plane varies in different anterior overbite patients. During orthodontic treatment in different overbite class Ⅲ patients, the vertical height of the posterior teeth and the rotation of the occlusion plane should be controlled.