Department of Oral Anatomy and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
J Adv Prosthodont. 2013 Aug;5(3):326-32. doi: 10.4047/jap.2013.5.3.326. Epub 2013 Aug 31.
The purpose of this study was to compare stress distributions of implant-supported crown placed in fibula bone model with those in intact mandible model using three-dimensional finite element analysis.
Two three-dimensional finite element models were created to analyze biomechanical behaviors of implant-supported crowns placed in intact mandible and fibula model. The finite element models were generated from patient's computed tomography data. The model for grafted fibula was composed of fibula block, dental implant system, and implant-supported crown. In the mandible model, same components with identical geometries with the fibula model were used except that the mandible replaced the fibula. Vertical and oblique loadings were applied on the crowns. The highest von Mises stresses were investigated and stress distributions of the two models were analyzed.
Overall stress distributions in the two models were similar. The highest von Mises stress values were higher in the mandible model than in the fibula model. In the individual prosthodontic components there was no prominent difference between models. The stress concentrations occurred in cortical bones in both models and the effect of bicortical anchorage could be found in the fibula model.
Using finite element analysis it was shown that the implant-supported crown placed in free fibula graft might function successfully in terms of biomechanical behavior.
本研究旨在通过三维有限元分析比较腓骨骨模型和完整下颌骨模型中种植体支持的牙冠的应力分布。
为了分析种植体支持的牙冠在完整下颌骨和腓骨模型中的生物力学行为，创建了两个三维有限元模型。有限元模型是从患者的计算机断层扫描数据中生成的。腓骨移植模型由腓骨块、牙种植体系统和种植体支持的牙冠组成。在下颌骨模型中，使用与腓骨模型相同的几何形状的相同组件，只是用下颌骨代替了腓骨。在牙冠上施加垂直和倾斜载荷。研究了最高 von Mises 应力，并分析了两种模型的应力分布。
两种模型的整体应力分布相似。下颌骨模型中的最高 von Mises 应力值高于腓骨模型。在个别修复体组件中，两种模型之间没有明显差异。在两种模型中，皮质骨均出现了应力集中，并且在腓骨模型中可以发现双皮质锚固的效果。
通过有限元分析表明，游离腓骨移植中植入的牙冠在生物力学行为方面可能成功运作。
