摘要
目的评价运用自锁托槽和传统托槽在正畸治疗中对牙根吸收的影响。方法选取江苏省苏州市吴江区中医医院口腔科60例正畸患者。30例为安氏Ⅰ类均角错牙合畸形患者:其中15例采用自锁托槽矫治,15例采用传统直丝托槽;另外30例为安氏Ⅱ类患者,进行拔牙矫正,其中15例采用自锁托槽矫治,15例采用传统直丝托槽。两组患者治疗前、后分别拍摄螺旋CT,选取上颌中切牙为研究对象,进行长度测量,以釉牙骨质界与根尖的距离代表牙根长度。结果自锁托槽与传统托槽均可造成上颌中切牙牙根吸收;拔牙组的患者较非拔牙组的牙根吸收量增加,经统计分析,差异有显著性;不管是拔牙组还是非拔牙组,使用自锁托槽均较使用普通托槽的患者牙根吸收量低,经统计分析,差异也有显著性。结论自锁托槽与传统托槽均可造成切牙根吸收,但自锁托槽的使用可减轻正畸所致炎性牙根吸收的程度,其可能的原因是牙齿移动的力值较小,正畸治疗的疗程较短。
Objective To compare the difference of root resorption after treatment of self-ligating and conventional preadjusted brackets evaluated by computed tomography. Methods 60 young adult orthodontic patients, regardless of gender, were chosen in Wujiang Chinese Medicine Hospital. 30 of them were Angle Class Ⅰ malocclusion and treated with self-ligating （15） and conventional preadjusted brackets （15）. The other 30 cases were Class Ⅱ malocclusion treated by extraction therapy with self-ligating （ 15 ） and conventional preadjusted brackets （15）. Spiral CT was scanned before and after the treatment. The root length （distance between cemento-enamel junction and root apical ） of maxillary central incisors was measured. Results Both kinds of brackets could cause shortening of root length. More root resorption was found in Class Ⅱ patients treated with extraction therapy compared with non extraction group and the difference had statistical significance. Less root resorption was found in patients treated by self-ligating brackets than in conventional preadjusted brackets in both Class Ⅰ and Class Ⅱ groups and the difference also had statistical significance. Conclusion Both conventional and self ligating brackets can cause shortening of root length. Self-ligating brackets can reduce the degree of orthodontically induced inflammatory root resorption and the possible reasons are lower values of tooth movement force and shortening of orthodontic treatment time.
作者
陆一平
LU Yiping.(Department of Stomatology, Wujiang Suzhou District Chinese Medicine Hospital, Suzhou 215221, China)
出处
《口腔医学》
CAS
2017年第7期635-637,共3页
Stomatology
关键词
自锁托槽
牙根吸收
螺旋CT
self-ligating brackets
root resorption
spiral CT
