自锁托槽与传统托槽导致正畸牙根吸收的锥形束CT比较

Comparison of root resorption between self-ligating and conventional brackets using cone-beam CT

目的:比较被动自锁托槽与传统直丝弓托槽造成牙根根尖外吸收量的差异,分析被动自锁托槽与牙根吸收的关系。方法:将50例患者随机分为2组,每组25例,分别应用被动自锁托槽或传统直丝弓托槽(0.022系统)进行矫治。治疗前、后拍摄锥形束CT(CBCT),测量上切牙的牙根根尖外吸收量。采用SPSS17.0软件包对2组牙根根尖外吸收量的差异进行t检验。结果:被动自锁托槽和传统直丝弓托槽治疗结束后,上颌切牙牙根吸收量无显著差异(P>0.05)。结论 :被动自锁托槽和传统直丝弓托槽都会造成一定量的牙根吸收,但两者造成的牙根根尖外吸收量差异无显著性,不能认为被动自锁托槽会诱发更多的牙根吸收。

PURPOSE： To analyze the differences of root resorption between passive self-ligating and conventional brackets, and to determine the relationship between passive self-ligating brackets and root resorption. METHODS： Fifty patients were randomly divided into 2 groups using passive self-ligating brackets or conventional straight wire brackets（0.022 system）, respectively. Cone-beam CT was taken before and after treatment. The amount of external apical root resorption of maxillary incisors was measured on CBCT images. Student＇s t test was performed to analyze the differences of root apical resorption between the 2 groups with SPSS17.0 software package. RESULTS： No significant difference（P〉 0.05） in root resorption of maxillary incisors was found between passive self-ligating brackets and conventional brackets.CONCLUSIONS： Passive self-ligating brackets and conventional brackets can cause root resorption, but the difference was not significant. Passive self-ligating brackets do not induce more root resorption.