Abstract：
This study analyzed the stress distributions on zygomatic and dental implants placed in the zygomatic bone, supporting bones, and superstructures under occlusal loads after maxillary reconstruction with obturator prostheses. A total of 12 scenarios of 3-dimensional finite element models were constructed based on computerized tomography scans of a hemimaxillectomy patient. Two obturator prostheses were analyzed for each model. A total force of 600 N was applied from the palatal to buccal bones at an angle of 45°. The maximum and minimum principal stress values for bone and von Mises stress values for dental implants and prostheses were calculated. When zygomatic implants were applied to the defect area, the maximum principal stresses were similar in intensity to the other models; however, the minimum principal stress values were higher than in scenarios without zygomatic implants. In models that used zygomatic implants in the defect area, von Mises stress levels were significantly higher in zygomatic implants than in dental implants. In scenarios where the prosthesis was supported by tissue in the nondefect area, the maximum and minimum principal stress values on cortical bone were higher than in scenarios where implants were applied to defect and nondefect areas. In patients who lack an alveolar crest after maxillectomy, a custom bar-retained prosthesis placed on the dental implant should reduce stress on the zygomatic bone. The stress was higher on zygomatic implants without alveolar crest support than on dental implants.
摘要：
这项研究分析了放置在the骨中的the骨和牙齿植入物上的应力分布，支撑骨骼,闭孔假体上颌骨重建后在咬合负荷下的上层建筑。基于对半马桥切除术患者的计算机断层扫描，总共构建了12种方案的3维有限元模型。对每个模型分析了两个闭孔假体。以45°的角度从pal骨施加600N的总力。计算了骨的最大和最小主应力值以及牙科植入物和假体的vonMises应力值。当颧骨植入物应用于缺损区域时，最大主应力的强度与其他模型相似；然而，最小主应力值高于没有zy骨植入物的情况。在缺损区域使用颧骨植入物的模型中，von骨植入物的von米塞斯应力水平明显高于牙科植入物。在假体由非缺损区域的组织支撑的情况下，皮质骨的最大和最小主应力值高于在缺损区和非缺损区应用植入物的情况.在上颌骨切除术后缺乏牙槽突的患者中，放置在牙种植体上的定制棒保留假体应减少对the骨的应力。没有牙槽突支撑的the骨植入物的应力高于牙科植入物。
