正畸治疗时间长短与牙根吸收关系的研究  

Clinical Research on Relationship between Length of Orthodontics Treatment and Root Resorption

作　　者：张玉峰[1] 郑纪伟[2] 严晓[1] 韩建国[2] 

机构地区：[1]徐州医学院第二附属医院口腔科,江苏徐州221006 [2]徐州医学院口腔医学院

出　　处：《口腔医学研究》2015年第9期901-903,共3页Journal of Oral Science Research

基　　金：江苏省高校自然科学基金(编号:12KJB320015)

摘　　要：目的：探讨口腔固定正畸治疗的矫治疗程长短对牙根吸收的影响。方法：选取13~19岁安氏Ⅱ类I分类患者,拔除4个第一前磨牙后,通过直丝弓矫治器进行矫治,并且在疗程中选取未采用种植体支抗干预的患者36例。按整个固定矫治疗程分为：短期组（〈18个月）和长期组（〉24个月）;牙根形态按等级分级,计算机进行统计分析各级頻数分布变化。对两组患者治疗前后,分别在牙冠处纵向固定5mm结扎丝拍摄锥形束CT（cone beam computed tomography,CBCT）片,并在CBCT上描画出上颌4颗切牙的轮廓,并进行牙根长度测量。通过牙根吸收等级计算公式计算出每颗牙齿矫治后牙根实际吸收量。结果：两组病例治疗后牙根吸收均达到1~2级居多;固定矫治治疗程超过2年的长期组牙根吸收达3~4级多于短期组,其差异有统计学意义（P〈0.01）;牙根长度吸收长期组多于短期组,其差异有统计学意义（P〈0.001）。结论：口腔固定正畸矫治疗程超过2年会加重正畸治疗中的牙根吸收,为临床治疗提供理论依据。Objective： To explore the influence of the time of fixed orthodontic treatment on root absorption. Methods： 36 patients （13-19 years old） with class II division 1 malocelusions were recruited, and treated by straight wire appliances after extraction of 4 first premolars without microimplants therapy. All patients were randomly assigned to short--term group （〈8 months） atad long-term group （〉24 months）. Teeth were classified by root morphology and analyzed using software to show their frequency distribution. To measure root length, panoramic radiographys were performed before and after treatment. To calculate distortion rates, a 5 mm ligature wire were cohered to the buccal sides of crown longitudinally before cone beam computed tomography （CBCT）. The outline of 4 upper incisors was drew on CBCT, and the root length was measured and calculated according to the distortion rates. Results： Both groups showed more root resorption in level 1-2 after the treatment. Patients who were trea- ted more than 2 years showed less level 3-4 dental root resorption than that of patients who were treated less than 1 year, and root uptake in the short term group was less than that of long term group （p〈 0.01）. Conclusion： The longer period of orthodontic treatment will lead to more root resorption, which will provide theoretical basis for clin- ical treatment.

关 键 词：正畸 牙根吸收 治疗时间 

分 类 号：R783.5[医药卫生—口腔医学]