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材料和方法 研究对象为80例(男40,女40)年龄为13～15岁的患者,均无正畸治疗史和严重的颅面不调(如腭裂),无上下第一磨牙和前牙缺失。术前拍摄头颅侧位定位片,将患者按前牙覆(牙合)(上下中切牙至(牙合)平面的距离)的大小分成4组:正常覆(牙合)组(OB:+1～+4mm),对(牙合)组(OB:-1～+1mm),开(牙合)组(OB≤-1mm),深覆(牙合)组(OB≥+4mm)。 测量项目为头颅侧位片上的12项线距、1个角度和3个面积的测量。面积测量使用电子面积测量仪。在不同组间和不同性别间的各项测量值
Materials and Methods 80 patients (40 males and 40 females) aged 13 to 15 years old were enrolled in this study. No history of orthodontic treatment and serious craniofacial disorders (such as cleft palate) were found. No upper and lower first molars and anterior teeth Missing. The patients were divided into 4 groups according to the size of the cusps (the distance between the upper and lower incisors and the occlusal plane): normal occlusal group (OB + 1 ~ + 4mm), occlusal group (OB: -1 ~ + 1mm), open occlusion group (OB≤-1mm), deep overbite group (OB≥ + 4mm). The measurement items are the measurement of 12 line distances, 1 angle and 3 areas on the cephalometric slice. Area measurement using the electronic area measuring instrument. Various measurements between different groups and between different sexes