本文通过对正畸患者矫治后6年及15年的牙齿模型的分析,评价矫治后患者牙弓形态和牙齿位置的长期疗效,目的在于预测矫治后牙弓形态和牙齿位置的稳定性。 材料和方法 36名患者均拔除第一双尖牙,采用方丝弓固定矫治方法,平均矫治年龄13.2岁,矫治时间2.1年,使用Hawley保持器,分别于矫治后6年和15年复诊。模型测量包括矫治前、矫治后,矫治后6年及15年的模型。 结果 牙弓宽度:上下颌尖牙间宽度矫治完成均 In this paper, the orthodontic patients after correction of 6 years and 15 years of dental models to evaluate the dental arch shape and tooth position after correction of long-term efficacy, the purpose is to predict the dental arch shape and tooth position stability. MATERIALS AND METHODS All 36 patients were involved in the removal of the first bicuspid anterior teeth and were treated with square arch fixation. The average age of correction was 13.2 years and the treatment time was 2.1 years. The patients were followed up for 6 years and 15 years respectively with the Hawley retainer. The model measurements include pre-treatment, post-treatment, post-orthodontic treatment of 6 and 15 years. Results dental arch width: maxillary mandibular canvarian width correction are completed