上颌切牙内收前后牙根及牙槽骨的变化
Changes in root and alveolar bone before and after treatment by retracting the upper incisors
作者：王玉兰,王铁军,柳忠豪
Author：Yulan Wang,Tiejun Wang,Zhonghao Liu
收稿日期：2018-04-05 年卷（期）页码：2018,36(6):638-638-645
期刊名称：华西口腔医学杂志
Journal Name：West China Journal of Stomatology
关键字：牙根吸收,上颌前突,锥形束CT,切牙内收,牙槽骨高度,
Key words：root absorption,maxillary protrusion,cone beam computed tomography,incisor retraction,alveolar bones height,
基金项目：
中文摘要
目的 通过锥形束CT（CBCT）测量并分析上颌前突患者上颌切牙内收治疗前后牙根及牙槽骨的变化。方法 选取2014年1月—2015年12月完成的正畸病例37例,其中男性17例,女性20例,平均14.5岁。所有患者拔除上颌双侧第一前磨牙且使用种植钉强支抗内收上颌切牙,通过头影测量获取上颌切牙内收角度、内收量及伸长量,使用NewTom NNT软件对CBCT数据进行多平面重建,调整冠状、轴向与矢状轴,选取通过切缘和根尖的牙齿长轴最长的矢状截面测量上颌切牙内收治疗前后牙根及牙槽骨的变化。结果 上颌前牙内收治疗前后,中切牙内收角度为12.92°±6.43°,内收量为（5.54±2.21） mm,伸长量为（0.60±0.95） mm,牙根吸收长度为（0.81±0.46） mm,牙根吸收率为6.80%±3.60%,切牙内收治疗前后牙根长度变化具有统计学差异（PPP结论 上颌前突患者代偿性治疗后,上颌切牙产生了明显的牙根吸收,唇侧牙槽骨高度降低。牙齿移动量越大,或超出了牙槽骨的解剖限制和改建限度,容易导致牙根吸收。唇侧牙槽骨高度变化量与切牙内收角度呈负相关。
英文摘要
ObjectiveUsing cone beam computed tomography (CBCT) in image measurement on the patients with maxillary protrusion, the study aims to identify the changes in root and alveolar bone before and after treatment by upper incisor retraction.MethodsThe study was conducted on 37 patients who have received orthodontic treatment from January 2014 to December 2015. The sample comprised 17 males and 20 females, with an average age of 14.5 years. The patients underwent extraction of bimaxillary premolars and given maximum anchorage to retract the upper incisors. The adducent angle, adducent amount, and the amount of elongation of the upper incisor teeth were measured by cephalograms. The patients were scanned by NewTom VGi to obtain CBCT data before and after treatment with upper incisor retraction. Using the NewTom NNT tool, we obtained the multiple planar reconstruction and then adjusted the coronal, axial, and sagittal axis. The sagittal section of the long axis of the maxillary central incisor through the incisal edge and root apex was selected to measure the changes in the root and alveolar bone before and after incisional treatment.ResultsBefore and after retracting the upper incisors, the adducent angle of central incisor measured 12.92°±6.43°. Adducent amount of the incisors reached (5.54±2.21) mm. Incisor extension amount totaled (0.60±0.95) mm. Root absorption length was (0.81±0.46) mm. Root absorption rate was 6.80%±3.60%. Statistical differences were observed in the changes in root length before and after incisor retraction (PPPConclusionAfter compensatory treatment of patients with maxillary protrusion, the root length of upper incisor was absorbed remarkably. The height of the labial-side alveolar bones was reduced. A greater tooth movement or beyond the anatomical limitations and alteration limits of the alveolar bone can easily lead to root resorption. A negative correlation exists between the variable quantity of the labial-side alveolar bones and adducent angle of the upper incisor.
【关闭】
