Alfawazan Ahmed Ali, Manas Abhigyan, Verghese Yohan, Kochhar Anuraj Singh, AlMogbel Abdul Majeed, Patil Smita
Department of Preventive Dentistry, College of Dentistry in Ar Rass, Qassim University, Al-Qassim Region, Saudi Arabia.
Department of Dentistry, UP University of Medical Sciences Saifai, Utter Pradesh, India.
J Orthod Sci. 2022 May 4;11:26. doi: 10.4103/jos.jos_123_21. eCollection 2022.
The study was conducted to assess the changes in bone density before and after performing accelerated orthodontic maxillary canine retraction by microosteoperforations (MOPs).
Forty patients (120 cone-beam computed tomography [CBCT] images) within the age group of 15 to 25 years undergoing fixed orthodontic treatment with bilateral maxillary first premolar extraction were enrolled in this study. The right and left sides of the maxillary jaw in the same patients were selected as experimental and control sites. To accelerate the tooth movement, MOPs were performed distal to the canine root in the extraction space under local anesthesia with a miniscrew. Thereafter, the maxillary canine retraction was initiated using a NiTi closed coil spring. The CBCT images were taken and evaluated at the following time intervals: 1 week before MOPs(T0);1 week after MOPs(T1);3 weeks after MOPs(T2).
A statistically significant reduction in bone density was observed at the center of resistance of canine on the experimental site (after MOPs) at 1 week and 3 weeks (T0-T1 = 0.000,0.115; T1-T2 = 0.0025,0.0117), whereas a statistically non-significant difference was found 1 week before and 3 weeks later in the control group.
Accelerated orthodontics by MOPscan result in a substantial reduction in bone density during canine retraction, leading to an increase in the tooth movement rate, hence lowering the overall orthodontic treatment time.
本研究旨在评估通过微骨开窗术（MOPs）进行上颌尖牙加速正畸远中移动前后的骨密度变化。
选取40例年龄在15至25岁之间、接受双侧上颌第一前磨牙拔除固定正畸治疗的患者（120张锥形束计算机断层扫描[CBCT]图像）纳入本研究。将同一患者上颌骨的左右两侧分别作为实验部位和对照部位。为加速牙齿移动，在局部麻醉下使用微型螺钉在拔牙间隙的尖牙牙根远中进行微骨开窗术。此后，使用镍钛闭合曲弹簧开始上颌尖牙远中移动。在以下时间间隔拍摄CBCT图像并进行评估：微骨开窗术前1周（T0）；微骨开窗术后1周（T1）；微骨开窗术后3周（T2）。
实验部位（微骨开窗术后）尖牙阻力中心在1周和3周时骨密度出现统计学显著降低（T0 - T1 = 0.000,0.115；T1 - T2 = 0.0025,0.
