埋伏上颌中切牙牵引萌出前、后牙根形态的变化  

Root shape changes of impacted upper central incisor before and after orthodontic traction

作　　者：董宏伟[1,2] 许世梃[1,2] 俞殷隽 梁勤[1,2] 

机构地区：[1]石四箴口腔医疗中心 [2]同济大学儿童口腔医学研究所,上海200032

出　　处：《上海口腔医学》2016年第1期72-76,共5页Shanghai Journal of Stomatology

摘　　要：目的 :应用锥形束CT(cone-beam CT,CBCT)观察埋伏上颌中切牙牵引萌出前、后牙根形态的三维变化,探讨埋伏上颌中切牙牵引萌出的时机。方法:对10例经曲面体层片确诊的上颌埋伏中切牙拍摄CBCT进行精确定位,进行外科开窗和正畸牵引萌出,排齐牙列,治疗后拍摄CBCT图像对牵引效果和牙根发育进行评估。结果:10例埋伏上颌中切牙均成功牵引到位,牵引前牙根已发育完成的4例埋伏牙牙根形态未发生变化;而牵引前牙根未发育完成的6例埋伏牙在治疗过程中牙根继续发育,弯曲度和长度均有改善。结论:埋伏上颌中切牙在牙根尚未发育完成前进行牵引萌出可以收到较好的治疗效果。PURPOSE： Changes of root shape of impacted upper central incisor before and after orthodontic traction were observed with dental cone-beam CT （CBCT）, the timing for traction of impacted upper central incisor was investigated. METHODS： Ten impacted maxillary central incisors were diagnosed via panoramic radiograph. CBCT images were taken preoperatively for accurate localization. Following combined treatment of dental surgery and orthodontic traction, ten impacted maxillary central incisors were guided out and aligned well. Final treatment results and the root development status were evaluated via CBCT. RESULTS： Ten impacted maxillary central incisors were tracted to normal position. CBCT images before and after treatment showed that the root of impacted incisors with completed root apex had no change in shape, while the root of impacted incisors with uncompleted root apex developed continually with obviously improved shape and length. CONCLUSIONS： Optimistic results can he achieved if the traction of impacted upper central incisor is carried out before root development completed.

关 键 词：埋伏上颌中切牙 正畸牵引 锥形束CT 

分 类 号：R783.5[医药卫生—口腔医学]