安氏Ⅱ类2分类错模型分析

MODEL ANALYSIS OF ANGLE CLASS Ⅱ DIVISION 2 MALOCCLUSION

目的研究安氏Ⅱ类2分类错[牙合]病人牙异常的表现，从而探讨安氏Ⅱ类2分类错[牙合]与各种牙异常的关系。方法对102例年龄12-49岁正畸治疗前的安氏Ⅱ类2分类错[牙合]牙进行分析研究，对BOLTON指数异常及各种牙异常，如畸形侧切牙、缺失牙、多生牙、阻生牙、易位牙、扭转牙进行统计分析。结果安氏Ⅱ类2分类错[牙合]病人牙异常的发生率为50．00％。前牙BOLTON指数不调者占42．16％，全口牙BOLTON指数不调者占41.18％。上颌畸形侧切牙者占25．49％，缺失牙者占10．78％，多生牙者未见，阻生牙者占3．92％，易位牙者占2．94％，牙齿扭转约90°者占7．84％。结论安氏Ⅱ类2分类错[牙合]病人牙异常的发生率较高，为了达到最佳的治疗效果，在矫治过程中更要关注上颌畸形侧切牙与下切牙缺失以及BOLTON指数不调的问题。

Objective To study congenital tooth anomaly of Angle class Ⅱ division 2 malocclusion and investigate the relationship between them. Methods A study was done in 102 untreated patients, age 12-49 years old, with Angle class Ⅱ division 2. The data of BOLTON index discrepancies and congenital tooth anomalies such as small size of maxillary lateral incisors, missing lower incisors, supernumerary teeth, tooth impactions, transposed teeth and rotated teeth were analyzed. Results In malocclusion of class Ⅱ division 2, 50.00% of the patients had congenital tooth anomaly. The BOLTON index discrepancies of anterior teeth accounted for 42.16%, of full-mouth teeth for 41.18%. The results also showed that there were 25.49% of the patients with small size of maxillary lateral incisor, 10.78 % with missing lower incisor, no supernumerary tooth, 3.92 % with tooth impaction, 2.94% with transposed tooth and 7.84% with tooth reversed about 90%. Conclusion The incidence of congenital tooth abnormality is higher in Angle class Ⅱ division 2 malocclusion. In order to achieve the best therapeutic effect, more attention should be paid to small size of maxillary lateral incisor, missing lower incisor and BOLTON index discrepancy during treatment.