In this study, analytic models were used to simulate marginal resection in the area of the second premolar to the second molar region, and the mechanical effects on the mandible of residual bone mass, a maxillofacial prosthesis, and a reconstruction plate were evaluated by three-dimensional finite element analysis. As residual bone mass decreased, maximum principal stress increased near the anterior ramus of the mandible, and maximum shear stress increased at the anterior buccal region of the resected area. In the mandible with a maxillofacial prosthesis, the maximum principal stress distribution at the anterior ramus was lower, and the distribution of maximum shear stress at the anterior buccal region of the resected area was higher. When a reconstruction plate was used, maximum principal stress and maximum shear stress were lower. Thus, lower residual bone mass was associated with increased mandible deflection and torsion. In addition, presence of a maxillofacial prosthesis decreased deflection but increased torsion, and presence of a reconstruction plate decreased deflection and greatly decreased torsion. These findings suggest that decreased residual bone mass and maxillofacial prostheses increase fracture risk; however, presence of a reconstruction plate was effective in decreasing torsional stress, thereby reducing fracture risk in the mandible.

在这项研究中，使用分析模型来模拟第二磨牙至第二磨牙区域的边缘切除，并通过三步法评估对残余骨量，颌面假体和重建板对下颌骨的力学影响。三维有限元分析。随着残余骨量的减少，最大的主应力在下颌骨前支附近增加，最大的切应力在切除区域的前颊区域增加。在具有颌面部假体的下颌骨中，在前支的最大主应力分布较低，而在切除区的前颊区域的最大切应力分布较高。当使用重建板时，最大主应力和最大剪切应力较低。从而，较低的残余骨量与下颌偏转和扭转增加有关。另外，颌面假体的存在减少了挠曲但增加了扭转，重建板的存在减少了挠曲并大大减少了扭转。这些发现表明，残余骨量减少和颌面部假体增加了骨折风险。但是，重建板的存在可有效降低扭转应力，从而降低下颌骨的骨折风险。这些发现表明，残余骨量减少和颌面部假体增加了骨折风险。但是，重建板的存在可有效降低扭转应力，从而降低下颌骨的骨折风险。这些发现表明，残余骨量减少和颌面部假体增加了骨折风险。但是，重建板的存在可有效降低扭转应力，从而降低下颌骨的骨折风险。