Raza Monis, Sharma Payal, Kumar Piush, Vaish Shubhra, Pathak Bhavana
Department of Orthodontics and Dentofacial Orthopaedics, I.T.S. Center for Dental Studies and Research, Muradnagar, Ghaziabad, Uttar Pradesh, India.
Department of Periodontics, I.T.S. Center for Dental Studies and Research, Muradnagar, Ghaziabad, Uttar Pradesh, India.
J Orthod Sci. 2021 Jul 9;10:9. doi: 10.4103/jos.JOS_12_20. eCollection 2021.
The purpose of this split-mouth single-centered, parallel-group, randomized clinical trial was to evaluate the efficiency of corticotomy-facilitated orthodontics in rapid canine retraction.
The sample consisted of 10 patients (15-25 years old) requiring extraction of the maxillary first premolars with subsequent canine retraction. The patients' right sides were randomly assigned to either the corticotomy (experimental) or control groups. Corticotomy cuts and perforations were performed and canine retraction was initiated bilaterally with closed-coil nickel-titanium springs that applied 150 g of force. The following variables were examined till the end of canine retraction on both sides: Rate of canine retraction, canine root resorption, and patient perception of the procedure. The rate of canine retraction was assessed every month using study models while root resorption was evaluated using CBCT. Patient`s perception was evaluated using a 100 mm VAS.
Mean time taken for full completion of canine retraction: 5.7 months (test) and 7.1 months (control). Mean root resorption: 0.53 ± 0.10 (control) and 0.24 mm ± 0.10 (test). Mean VAS scores: 16 ± 3.94 (24 hours) and 2 ± 2.58 (1 week) at control side and 46.50 ± 6.69 (24 hours) and 2 ± 2.58 (1 week) at test.
There was an overall reduction in the time taken for canine retraction with corticotomy; however, an increase in the rate of canine retraction in the corticotomy-facilitated method was evident only for the first four months, compared to the conventional method. Less root resorption was observed in corticotomy-facilitated method than conventional method. Pain perception was more for corticotomy-facilitated method than conventional method at 24 hours, but similar after one week.
本单中心、平行组、随机临床试验的目的是评估皮质骨切开辅助正畸快速内收尖牙的效率。
样本包括10例（15 - 25岁）需要拔除上颌第一前磨牙并随后内收尖牙的患者。患者的右侧随机分为皮质骨切开术（试验组）或对照组。进行皮质骨切开切口和穿孔，双侧使用施加150g力的闭合镍钛弹簧开始内收尖牙。在两侧尖牙内收结束前检查以下变量：尖牙内收速率、尖牙根吸收情况以及患者对该过程的感受。每月使用研究模型评估尖牙内收速率，使用CBCT评估根吸收情况。使用100mm视觉模拟评分法（VAS）评估患者的感受。
尖牙完全内收的平均时间：试验组为5.7个月，对照组为7.1个月。平均根吸收：对照组为0.53±0.10，试验组为0.24mm±0.10。平均VAS评分：对照组在24小时时为16±3.94，1周时为2±2.58；试验组在24小时时为46.50±6.69，1周时为2±2.58。
皮质骨切开术使尖牙内收时间总体减少；然而，与传统方法相比，皮质骨切开辅助方法仅在前四个月尖牙内收速率明显增加。皮质骨切开辅助方法比传统方法观察到的根吸收更少。皮质骨切开辅助方法在24小时时的疼痛感受比传统方法更强烈，但在一周后相似。
