林茜茜

    【摘 要】目的 探討无托槽隐形矫治器对成人拔牙患者上中切牙压低效率、前牙区牙槽骨及牙周膜应力的影响。方法 选取2021年1月-2022年10月于西宁市第一人民医院口腔正畸科行拔牙矫正的80例成人患者为研究对象，均接受无托槽隐形矫治器治疗。通过Ansys workbench 2020 r2针对患者前牙区牙槽骨、牙周膜最大应力值和移动距离进行回归分析。结果 80例患者的A值为(3.82±0.92)mm，B值为(0.57±0.43)mm，C值为(-0.23±0.72)mm；B值、C值均小于A值，差异有统计学意义(P0.05)；D压经过重叠测量为(-3.64±1.40)mm；C值与D值比较，差异无统计学意义(P>0.05)；三维有限元分析模型中显示，9例患者牙根尖处、牙周膜颈缘处为出现最大应力值的部位；相关性回归分析中显示，9例患者右上颌尖牙牙周膜颈缘处最大应力值、移动距离在直线、对数、指数上存在相关性(P0.05). The D pressure was (-3.64±1.40) mm by overlapping measurement. There was no significant difference between C value and D value (P>0.05). The three-dimensional finite element analysis model showed that the root tip and the cervical margin of periodontal ligament were the sites with the maximum stress value in 9 patients. Correlation regression analysis showed that the maximum stress value and moving distance at the cervical margin of the periodontal membrane of the right maxillary canine in 9 patients were correlated in straight line ......