Gupta Himani, Chugh Vinay Kumar, Sardana Rinkle, Bhatia Navleen Kaur, Kumar Pravin, Singh Surjit
Former Resident, Section of Orthodontics, Department of Dentistry, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India.
Professor, Section of Orthodontics, Department of Dentistry, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India.
J World Fed Orthod. 2025 Feb;14(1):27-33. doi: 10.1016/j.ejwf.2024.08.005. Epub 2024 Oct 19.
The aim of this study was to evaluate the alveolar crestal bone height, alveolar bone thickness, and root resorption in mandibular incisors after fixed orthodontic treatment.
A total of 35 patients (mean age 17.02 ± 3.24 years) with moderate to severe mandibular anterior crowding requiring first premolar extraction were included. Cone beam computed tomography scans of the mandibular anterior region were obtained from the patients before and after orthodontic treatment. The alveolar crestal bone height, cortical bone thickness (CBT) (at apex and midroot level), labial and lingual alveolar bone thickness, and root resorption were assessed for all mandibular incisors. Paired Student's t test was used to compare pretreatment and post-treatment alveolar bone changes and root resorption.
A significant decrease in lingual crestal bone height was observed in all mandibular incisors after orthodontic treatment (P < 0.001). Lingual CBT decreased at the midroot level significantly for all mandibular incisors after completion of orthodontic treatment (P < 0.001). A significant decrease in total lingual bone thickness was observed in all mandibular incisors (P < 0.001). Root lengths of mandibular incisors decreased significantly in the sagittal and coronal sections after orthodontic treatment (P < 0.001).
Fixed orthodontic treatment with premolar extraction results in a significant reduction of alveolar crestal bone height, CBT (at midroot level), and alveolar bone thickness on the lingual aspect of mandibular incisors. Significant orthodontically induced inflammatory root resorption was observed in all mandibular incisors after orthodontic treatment.
本研究旨在评估固定正畸治疗后下颌切牙的牙槽嵴顶骨高度、牙槽骨厚度和牙根吸收情况。
共纳入35例（平均年龄17.02±3.24岁）需要拔除第一前磨牙的中重度下颌前牙拥挤患者。在正畸治疗前后获取患者下颌前部区域的锥形束计算机断层扫描图像。对所有下颌切牙的牙槽嵴顶骨高度、皮质骨厚度（在根尖和牙根中部水平）、唇侧和舌侧牙槽骨厚度以及牙根吸收情况进行评估。采用配对t检验比较治疗前和治疗后牙槽骨变化及牙根吸收情况。
正畸治疗后所有下颌切牙的舌侧牙槽嵴顶骨高度均显著降低（P<0.001）。正畸治疗结束后，所有下颌切牙牙根中部水平的舌侧皮质骨厚度均显著降低（P<0.001）。所有下颌切牙的舌侧总骨厚度均显著降低（P<0.001）。正畸治疗后下颌切牙的牙根长度在矢状面和冠状面均显著缩短（P<0.001）。
拔除前磨牙的固定正畸治疗导致下颌切牙舌侧牙槽嵴顶骨高度、牙根中部水平的皮质骨厚度和牙槽骨厚度显著降低。正畸治疗后所有下颌切牙均出现明显的正畸性炎性牙根吸收。
