固定功能矫治器作用下上颌骨应力变化的评估——一项三维有限元研究。
Evaluation of stress changes in the maxilla with fixed functional appliances-A 3D FEM study.
作者信息
Kendre Balaji, Kumar Anil, Shetty K Nillian, Hedge Gautham, Umale Vinay, Kulshrestha Rohit
机构信息
Department of Orthodontics and Dentofacial Orthopedics, Yogita Dental College, Khed, Maharashtra, India.
Department of Orthodontics and Dentofacial Orthopedics, AJ Institute of Dental Sciences, Mangalore, Karnataka, India.
出版信息
J Orthod Sci. 2021 Jul 9;10:10. doi: 10.4103/jos.JOS_33_20. eCollection 2021.
AIM
To evaluate the stress changes in the maxilla during fixed functional appliance use using three-dimensional finite element method (FEM) stress analysis.
SETTINGS AND SAMPLE POPULATION
A three-dimensional finite element model of the maxilla was constructed using the images generated from the cone-beam computed tomography of a patient treated for Class II malocclusion with a fixed functional orthodontic appliance. The FEM was used to study the stress changes seen in the maxilla, which were evaluated in the form of highest von Mises stress and maximum principal stress before and after the application of fixed functional appliance.
RESULTS
Higher areas of stress were seen in the model of the maxilla with the fixed functional appliance (140 MPa) compared to that in the resting stage (58.99 MPa).
CONCLUSIONS
An increase in the maximum principal stress and von Mises stress in the posterior regions of the maxilla and maxillary teeth was seen. The stresses seen were double than that without the appliance. A high distalization force on the maxilla was seen with the fixed functional appliance.
目的
运用三维有限元方法（FEM）应力分析评估固定功能矫治器使用过程中上颌骨的应力变化。
设置与样本人群
使用接受固定功能正畸矫治器治疗的Ⅱ类错牙合患者的锥束计算机断层扫描生成的图像构建上颌骨的三维有限元模型。有限元方法用于研究上颌骨中观察到的应力变化，这些变化以应用固定功能矫治器前后的最高冯·米塞斯应力和最大主应力的形式进行评估。
结果
与静止阶段（58.99兆帕）相比，使用固定功能矫治器的上颌骨模型中出现了更高的应力区域（140兆帕）。
结论
上颌骨和上颌牙齿后部区域的最大主应力和冯·米塞斯应力增加。观察到的应力是未使用矫治器时的两倍。使用固定功能矫治器时，上颌骨受到较高的远中移动力。
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