错[牙合]畸形正畸治疗患者的拔牙与相关因素的研究

Relative factors of tooth extraction in orthodontic treatment

目的 研究不同类型错[牙合]畸形患者正畸治疗中的拔牙率,探讨临床常用研究指标对拔牙决策的贡献大小.方法 采用回顾性研究,选用了北大口腔正畸科1423例病例,研究其拔牙率及影响闪素,并对所有因素进行Logistic回归分析.结果 总样本拔牙率为56.6%.最终入选Logistic回归方程的有：年龄、上颌拥挤度、下颌拥挤度、覆盖、覆耠、下唇凸距、是否双颌前突、性别、下颌平面角以及安氏分类.结论 正畸拔牙决策的制定需要着重参考入选Logistic回归方程的因素.

Objective To investigate the extraction frequencies in different types of malocclusion, and the factors affecting decision in extraction or non-extraction. Methods As a retrospective study, it contained 1423 patients who were treated orthodontically in department of orthodsntics, Peking Univerity School of Stomatology. The extraction percentages and factors affecting the decision in extraction or non-extraction were analyzed. Results 56. 6% were extraction cases. Age, sex, degree of crowding, classification, overbite, overjet, bimaxillary protrusion,MP-SN angle and distance from Ricketts esthetic plane to the lower lip were the factors selected by Logistic regression equation. Conclusions Factors selected by Logistic regression equation contributed to the decision in extraction or non-extraction.