白银地区安氏Ⅱ类错牙合畸形患者Bolton指数的研究

Study on Bolton index of classⅡmalocclusion patients in Baiyin

目的:测量上下颌牙齿是否协调常用的方法是Bolton指数法,通过该方法测量分析白银地区安氏Ⅱ类错牙合畸形患者的Bolton指数及其异常的分布比例,预测矫治后的咬合关系。方法:对白银地区200例安氏Ⅱ类错牙合畸形患者的记存模型进行牙冠宽度测量,并对Bolton指数及其分布进行分析。结果:200例患者中Bolton指数前牙比异常者占39.93%,偏大者占27.31%,偏小者占12.62%。全牙比异常者占46.13%,偏大者占28.44%,偏小者占17.69%。Bolton指数前牙比和全牙比男女间差异均无显著性。结论:白银地区安氏Ⅱ类错牙合畸形患者Bolton指数异常的发生率较高,且偏大者发生率高于偏小者,且全牙比异常者多于前牙比异常者。

Objective：The Bolton index is often used to measure the coordination of upper-lower teeth in orthodontic treatment,To investigate Bohon index of class ]I malocclusion patients and its abnormal distribution ratio in Baiyin,the Bohon index is used to forecast the relation of occlusion after treatment. Methods： class II malocclusion patients （male 116, female 92）, with average age 15.28±1.92 （ 13-18 ）, were selected. The tooth width were measured,and then Bolton index and the incidence of abnormal Bohon index were analyzed. Results： The incidence of abnormal Bohon anterior ratio was 39.93% ,in which the incidence of the oversized group was 27.31% ,and that of the undersized group was 12.62%. The incidence of abnormal Bolton allover ratio was 46.13% ,in which the incidence of the oversized group was 28.44% ,and that of the undersized group was 17.69%. There was no significant gender difference both in Bohon anterior ratio and overall ratio. Conclusion： The incidence of abnormal Bolton index is considerably high in Baiyin.