应用CBCT研究不同矫治器正畸拔牙矫治对前牙区牙根及牙槽骨的影响

目的 应用CBCT研究无托槽隐形矫治及传统固定矫治器正畸拔牙对前牙区牙根及牙槽骨的变化情况.方法 选择成人拔牙矫正的患者60例,随机分为无托槽隐形矫治器组及传统固定矫治器组(N=30).正畸治疗前后拍摄CBCT,测量两组正畸患者上下颌中切牙、侧切牙、尖牙的牙根长度及牙槽骨的厚度变化情况.结果 固定矫治器组较无托槽隐形矫...

The effects of different appliances on tooth roots and alveolar bone in the anterior region of orthodontic extraction cases assessed by cone-beam CT

Objective To investigate the effects of bracket-free invisible appliance and traditional fixed appliances on tooth roots and alveolar bone in the anterior region in orthodontic extraction cases with cone-beam CT(CBCT).Methods A total of 60 adult patients were selected for orthodontic treatment after tooth extraction,and they were randomly divided into two groups:bracket-free invisible appliance group(N=30)and traditional fixed appliance group(N=30).The CBCT scans of the patients were obtained before and after orthodontic treatment to measure the thickness of alveolar bone and root lengths of central incisors,lateral incisors,and canines.Results The root resorption of the central incisors and lateral incisors in the fixed appliance group was more obvious than that in the invisible appliance group without brackets.In the meantime,the difference in root resorption of maxillary lateral incisor in the two groups was even more remarkable.By contrast,there was no significant difference in the changes in the root lengths of maxillary and mandible canines of the two groups and the changes in the thickness of the alveolar bone of the two groups.Conclusion In orthodontic extraction cases,the effect of the bracket-free invisible appliance on root resorption is significantly less than that of the fixed appliance,while the two appliances have a similar influence on alveolar bone reconstruction.