Int J Oral Maxillofac Implants. 2019 Nov/Dec;34(6):e107-e114. doi: 10.11607/jomi.7255.
To evaluate the biomechanical behaviors of different framework materials in implant-supported fixed mandibular prostheses using three-dimensional (3D) finite element analysis.
A model of a severely resorbed edentulous mandible was obtained from a tomography database. Morse taper-connection implants and multi-unit abutments were cut with an electro-erosion machine and scanned using a 3D scanner. The implants were positioned on the model at the bone level and distributed equally to support a fixed complete prosthesis. The simulations were divided into six groups according to the framework material: titanium (Ti); cobalt-chromium (Co-Cr); zirconia (ZrO); polyether ether ketone (PEEK); carbon fiber-reinforced polyether ether ketone (CFR-PEEK); and polymethyl methacrylate (PMMA). The resultant load applied was obtained from the masseter, temporal, lateral, and medial pterygoid muscles. The principal stresses and von Mises equivalent stresses were analyzed and compared among the framework materials, and the results were described both quantitatively and qualitatively.
PEEK and PMMA frameworks showed the highest total deformation values, showing decreases of von Mises stresses in the frameworks, implants, and abutments, but with a high tensile stress in the trabecular bone that achieved critical values. CFR-PEEK frameworks achieved their failure limit, whereas the ZrO, Co-Cr, and Ti frameworks exhibited principal stresses in the bone region within physiologic limits.
From a biomechanical point of view, the Ti, Co-Cr, and ZrO frameworks demonstrated the most favorable outcomes.
通过三维有限元分析评估种植体支持的下颌固定义齿不同支架材料的生物力学行为。
从断层扫描数据库中获取严重吸收的无牙下颌骨模型。使用电火花机切割莫氏锥度连接种植体和多单位基台，并使用 3D 扫描仪进行扫描。将种植体置于模型的骨水平并均匀分布以支撑固定全口义齿。根据支架材料将模拟分为六组：钛（Ti）；钴铬（Co-Cr）；氧化锆（ZrO）；聚醚醚酮（PEEK）；碳纤维增强聚醚醚酮（CFR-PEEK）；和聚甲基丙烯酸甲酯（PMMA）。所得加载力来自于咬肌、颞肌、翼外肌和翼内肌。分析和比较了不同支架材料的主应力和 von Mises 等效应力，并对结果进行了定量和定性描述。
PEEK 和 PMMA 支架的总变形值最高，支架、种植体和基台的 von Mises 应力降低，但小梁骨的拉伸应力较高，达到临界值。CFR-PEEK 支架达到失效极限，而 ZrO、Co-Cr 和 Ti 支架在骨区的主应力在生理范围内。
从生物力学的角度来看，Ti、Co-Cr 和 ZrO 支架表现出最有利的结果。
