不同部位植入微种植钉进行前方牵引时上颌骨旋转趋势

目的 研究在不同部位植入微种植钉进行前方牵引时上颌骨旋转趋势的差异，以期为临床正畸选择合适的种植钉植入部位提供参考和依据。方法 在建立的微种植钉辅助上颌骨进行前方牵引的三维有限元模型基础上，分别将微种植钉植入在上颌颧牙槽嵴区和前牙区（双侧侧切牙与尖牙牙根上方6 mm），分析500 g牵引力在不同牵引部位及方向条件下上颌骨旋转趋势的差异。结果 在颧牙槽嵴区进行牵引时，上颌骨主要呈逆时针旋转趋势；在前牙区进行牵引时，上颌骨主要呈顺时针旋转趋势。结论 当治疗反覆合较深的患者时，选择在颧牙槽嵴区进行牵引会有较好的效果；当治疗浅覆合伴有开合的反合患者时，选择在前牙区进行牵引会有较好的效果。
Objective To investigate the differences in rotation trends of maxillary complex through planting mini-implants in different maxillary positions for the protraction of craniofacial suture, so as to provide reference and basis for the appropriate implantation location in clinical orthodontics. Methods The 3D finite element model of the maxillary complex with mini-implant assisted maxillary protraction was established, and the mini-implants were planted in maxillary infrazygomatic crest and the anterior region (6 mm above the root of bilateral incisors and canine), respectively. Traction force of 500 g was applied to analyze the differences in rotation trend of the maxillary complex at different maxillary positions and in different directions. Results When protracted in maxillary infrazygomatic crest region, the maxilla mainly showed counterclockwise rotation trend. When protracted in anterior region, the maxilla mainly showed clockwise rotation trend. Conclusions Protraction at infrazygomatic crest is more suitable for treating patients with hypodivergent crossbite, while protraction in maxillary anterior region is more suitable for treating patients with hyperdivergent crossbite.