摘要
目的 :通过对种植修复上部义齿9种不同牙尖斜度设计的三维有限元分析 ,研究单颗种植修复上部义齿牙合面牙尖斜度的优化设计。方法 :利用ANSYS有限元分析软件建立包括下颌骨、种植体及9种不同牙尖斜度设计的上部义齿的三维有限元模型 ,在牙合面上施加两种面载荷 ,比较不同加载方式下不同设计的种植体周围应力分布。结果 :种植体与上部结构交界处、种植体颈部、种植体根尖区、种植体颈部周围骨皮质、种植体根端周围骨松质是应力集中区 ,应力最大值在种植体与上部结构交界处。结论 :不同牙尖斜度设计的种植体上部结构中 ,25°以上牙尖斜度的设计造成种植体颈部折断的危险性显著增加 。
Objective: To study the optimization of the cusp inclination design of single implant-supported prosthesis by the way of 3-dimensional finite element method.Methods: A volunteer's mandible with a single implant was scanned by helix computer tomography, then we established a 3-dimensional finite element model in ANSYS program. The model includes the mandible, the implant and the upper prosthesis in nine designs of cusp inclination. Loading the pressure on the occlusal surfaces respectively, we compared the von Mises stress distributions around the implant. Results: There were five stress concentration areas in area between the superstructure and implant, the implant neck, implant's apex, the cortical bone around the implant neck and the lingual side of around implant's apex. The maximum von Mises stress is located in the area between the superstructure and implant.Conclusion: The designs greater than 25°leads to is the best in the three cusp inclinations. The 25°is the best design in the three cusp inclinations. Thus in clinical practice, the methods to optimize implant design is feasible.
出处
《天津医科大学学报》
2003年第2期249-252,共4页
Journal of Tianjin Medical University
关键词
种植
修复
三维有限元
Implant
Rehabilitation
3-dimensional finite element analysis(3DFEA)
