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《Journal of Practical Stomatology》 2003-04
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Association between Angle class II division 2 malocclusion and congenital tooth anomalies

Zou Min, Zhou Hong, Li Yinxia, et al. Department of Orthodontics, Stomatological College of Xi`an Jiaotong University, Xi'an 710004  
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.
【CateGory Index】: R783.5
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