摘要
目的应用锥体束计算机断层（Cone beam computed tomography，CBCT）技术分析正畸牙移动早期牙根吸收的发生情况及其影响因素。方法选择108例正畸患者，432颗上切牙，治疗前及治疗5～9个月，平均（6．9±1．24）个月后分别拍摄上颌4个切牙CBCT。记录患者性别、初诊年龄、拔牙与否、安氏分类及追踪时间长短。对牙根吸收程度及相关因素进行统计分析，将发生根吸收超过1mm定义为具有临床意义的根吸收。结果上切牙的平均根吸收量为（0．45±0．49）mm，13．8％的上切牙及27．8％的患者发生了有临床意义的根吸收，2％的上切牙及6．5％的患者发生了严重根吸收，其中最大根吸收量为4．58mm。以牙根吸收量为因变量，患者性别、初诊年龄等为自变量行多元线性逐步回归分析，结果未显示与牙根吸收明显相关的危险因素。结论正畸治疗早期有临床意义的上切牙根吸收较为常见，但大多数较轻微。早期根吸收可能主要与患者的个体易感性有关。
Objective The purpose of this study was to measure the amount ol external apmal root resorption （EARR） by using cone beam computed tomography （CI3CT） and to determine which factors were clinically relevant in predicting the extent of EARR at the initial stage of orthodontic treatment. Methods CBCT radiographs were taken before treatment （T1） and at the stage of （6.9± 1.24） months of treatment （T2） in 432 teeth of 108 patients. Parameters about patient information such as gender, age at the beginning of treatment, extraction pattern, root shape and duration of follow-up were recorded. More than 1 mm of root resorption was considered to be clinically significant. Results Average root resorption of upper incisors was （0. 45±0. 49） mm, whereas the maximum amount of resorption was 4. 58 mm. Clinically significant resorption was found in 13. 8% of the incisors and 27. 8% of the patients, only 2% of the incisors and 6. 5% of the patients had the severe root resorption. Multivariate linear regression showed that the parameters recorded were not identified as risk factors to root resorption. Conclusions Root resorption of upper incisors is common at the initial stage of orthodontic treatment, but the resorption is usually slight. Individual susceptibility might be a major cause related with root resorption at the initial stage of treatment
出处
《中华口腔正畸学杂志》
2011年第2期84-88,共5页
Chinese Journal of Orthodontics
关键词
CBCT
正畸牙移动
牙根吸收
Cone beam computed tomography （CBCT）
Orthodontic tooth movement
External apical root resorption
