【摘要】 目的 :为了验证安氏II类 2分类错牙合与先天性牙异常如过小侧切牙、釉质发育不良、多生牙、易位牙、尖牙阻生和缺牙之间存在的关系。方法 :对 10 0例年龄 12～ 42岁未经历正畸治疗的II类 2分类错牙合患者的病史、口内、X片和牙模型进行检查 ,并进行样本百分比分析。结果 :结果显示牙异常者占 5 0 .0 0 %。 7.0 0 %的患者上侧切牙釉质发育不良 ,2 8.0 0 %过小侧切牙 ,4.0 0 %尖牙阻生 ,9.0 0 %下切牙缺失 ,易位牙为 2 .0 0 % ,无一例多生牙。 3 0 .0 0 %前牙Bolton比值不协调。结论 :安氏II类 2分类错牙合与过小侧切牙、釉质发育不良、先天缺牙密切相关。II类 2分类错牙合前牙Bolton比值不协调的主要因素是过小侧切牙和下切牙缺失更多还原

【Abstract】 Objective: To study the relationship between Angle Class II division 2 malocclusion and congenital anomalies of dentition, Methods: 100 untreated patients (aged 12～42 years old) with Class II division 2 malocclusion were investigated by history,general examination,radiograph and tooth model. The data of congenital tooth anomalies were analysed.Results: Congenital tooth anomaly was found in 50 of the patients. Upper lateral incisor enamel hypoplasia was found in 7 patients, small size of maxillary lateral incisor in 28, canine impaction in 4, missing of lower incisor in 9, transposition in 2 and anterior tooth Bolton ratio discrepancies in 30 of the patients. Conclusion: Angle Class II division 2 malocclusion is closely related to congenital tooth anomalies. The main factors of anterior tooth Bolton discrepancies may be the small size of maxillary lateral incisor and absence of lower incisor.更多还原