Hashem Bassem A, El-Hassanein El-Hassanein H, El-Awady Ahmed A, Mohamed Ahmed A, Hashem Mohamed I, Alsarani Majed M, Hussein Farouk A
Department of Orthodontics, Faculty of Dental Medicine for Boys, Al-Azhar University, Cairo, EGY.
Department of Orthodontics, Faculty of Dentistry, Menoufia University, Shebin El-Kom, EGY.
Cureus. 2024 Jan 10;16(1):e52026. doi: 10.7759/cureus.52026. eCollection 2024 Jan.
In the majority of orthodontic premolar extraction cases, the canine retraction phase is the most laborious procedure. This randomized clinical trial aimed to assess the effect of single versus repeated micro-osteoperforations (MOPs) during orthodontic canine retraction.
In this split-mouth study, two equal groups of 18 patients who required maxillary first premolar extractions and fixed orthodontic therapy were randomly assigned (n=9). In Group I, MOPs were only performed once on one site before retraction, whereas in Group II, MOPs were performed on one site repeatedly once a month for four months. In both groups, the contralateral control sites received no MOPs. The canines were retracted using mini-screws and closed-coil nickel-titanium springs. Using the patients' 3D models, the primary outcome measure at four months was the amount of orthodontic canine distal movement. The amount of anchorage loss (AL), degree of molar rotation (MR) and canine rotation (CR), and degree of canine tipping (CT) were measured as the secondary outcomes. The comparison of mean changes in the primary and secondary outcomes between the groups was done using the independent sample t-test (p<0.05).
The rate of canine retraction, degree of CT, and rotation were not significantly different between the two groups (p>0.05). Additionally, there were no statistically significant variations in the maxillary first MR and the degree of AL (p>0.05).
When maxillary canine retraction was performed with a single and repeated regimen of MOPs, comparable levels of distal CR and tipping were observed, along with an identical minimal degree of MR and AL.
在大多数正畸拔除前磨牙病例中，尖牙后移阶段是最费力的程序。这项随机临床试验旨在评估正畸尖牙后移过程中单次与重复微骨穿孔（MOPs）的效果。
在这项双侧对照研究中，将两组各18例需要拔除上颌第一前磨牙并接受固定正畸治疗的患者随机分组（n = 9）。在第一组中，在尖牙后移前仅在一个部位进行一次MOPs，而在第二组中，在四个月内每月在一个部位重复进行一次MOPs。两组中，对侧对照部位均未进行MOPs。使用微型螺钉和闭合镍钛弹簧使尖牙后移。利用患者的三维模型，四个月时的主要观察指标是正畸尖牙远中移动量。将支抗丧失量（AL）、磨牙旋转度（MR）和尖牙旋转度（CR）以及尖牙倾斜度（CT）作为次要观察指标进行测量。使用独立样本t检验对两组间主要和次要观察指标的平均变化进行比较（p < 0.05）。
两组间尖牙后移率、CT度和旋转度无显著差异（p > 0.05）。此外，上颌第一磨牙MR和AL度也无统计学显著差异（p > 0.05）。
当上颌尖牙后移采用单次和重复MOPs方案时，观察到远中CR和倾斜水平相当，同时MR和AL的最小程度相同。
