Department of Orthodontics; researcher, Bellvitge Institute of Biomedical Research, Barcelona, Spain.
Am J Orthod Dentofacial Orthop. 2010 Mar;137(3):346-53. doi: 10.1016/j.ajodo.2008.02.026.
Extraction of second permanent molars is an option for providing space in orthodontic treatment. Although many articles have described its impact on the outcome, there are few data on the prognosis of the eruption of the adjacent third molars. The aims of this investigation were to provide predictive models of eruption of third molars after second permanent molar extraction and to validate them.
A total of 48 patients (ages, 11-23 years) who had 128 second permanent molars (54 maxillary, 74 mandibular) extracted during orthodontic treatment were followed until eruption of the third molars was complete.
A lineal regression model predicted the final angle of the third molars with the permanent first molar by using the variables of initial angle, jaw, and the developmental stage of the third molar. A logistic regression model predicted the probability of correct eruption by using the variables of initial angle, jaw, sex, age, and the developmental stage of the third molar.
拔除第二恒磨牙是正畸治疗中提供间隙的一种选择。虽然许多文章已经描述了它对治疗结果的影响，但关于邻接第三磨牙萌出的预后数据较少。本研究的目的是提供第二恒磨牙拔除后第三磨牙萌出的预测模型，并对其进行验证。
共随访 48 名（年龄 11-23 岁）患者的 128 颗第二恒磨牙（上颌 54 颗，下颌 74 颗），这些牙齿在正畸治疗中被拔除，直到第三磨牙完全萌出。
线性回归模型使用初始角度、颌骨和第三磨牙的发育阶段来预测第三磨牙的最终角度与第一恒磨牙的关系。逻辑回归模型使用初始角度、颌骨、性别、年龄和第三磨牙的发育阶段来预测正确萌出的概率。
