Influence of microthreads and platform switching on stress distribution in bone using angled abutments
Influence of microthreads and platform switching on stress distribution in bone using angled abutments
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DOI：
10.1016/j.jpor.2012.02.002
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发表时间：
2012-10-01
影响因子：
3.6
通讯作者：
Rocha, Eduardo Passos
中科院分区：
文献类型：
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作者：
Cunha, Cacilda;Anchieta, Rodolfo Bmniera;Rocha, Eduardo Passos
目的：通过三维有限元分析，模拟微螺纹和平台切换种植体对倾斜基台的影响，评估笔式种植体骨的应力分布。假设微螺纹和平台切换的存在会降低皮质骨的应力集中。方法：建立4个由种植体支撑的中切牙（5.0 mm x 13 mm）的数学模型，其中颈部螺纹面类型（微螺纹或光滑）和倾斜基牙连接直径（5.0和4.1 mm）不同。这些模型包括RM（规则平台和微线程）、RS（规则平台和光滑颈部表面）、SM（平台切换和微线程）和SS（平台切换和光滑颈部）。采用ANSYS Workbench 10.0 （Swanson analysis System）进行分析。在中切牙的腭面施加100牛的斜载荷。骨/种植体界面被认为是完美整合的。得到了皮质骨和骨小梁的最大（sigma(max)）和最小（sigma(min)）主应力、等效von Mises应力（sigma(vM)）和最大主弹性应变（epsilon(max)）值。结果：皮质骨的sigma(max) （MPa）在RM（55.1）、RS（51.0）、SM（49.5）和SS（44.8）模型中最高。RM模型（45.4）、SM模型（42.1）、RS模型（38.7）和SS模型（37）的sigma(vM) （MPa）最高。在RM、SM、RS和SS模型中，sigma（min）值最高。对于小梁骨，RS模型的sigma（max）值（MPa）最高（6.55），其次是RM（6.37）、SS（5.6）和SM（5.2）模型。结论：微螺纹和开关平台的存在会降低皮质骨应力集中的假设部分被否定，主要是因为微螺纹增加了皮质骨的应力集中。只有平台切换降低了皮质骨的应力。(C) 2012年日本口腔修复学会由爱思唯尔爱尔兰出版。版权所有。
Purpose: To evaluate the stress distribution in pen-implant bone by simulating the effect of an implant with microthreads and platform switching on angled abutments through tridimensional finite element analysis. The postulated hypothesis was that the presence of microthreads and platform switching would reduce the stress concentration in the cortical bone.Methods: Four mathematical models of a central incisor supported by an implant (5.0 mm x 13 mm) were created in which the type of thread surface in the neck portion (microthreaded or smooth) and the diameter of the angled abutment connection (5.0 and 4.1 mm) were varied. These models included the RM (regular platform and microthreads), the RS (regular platform and smooth neck surface), the SM (platform switching and microthreads), and the SS (platform switching and smooth neck). The analysis was performed using ANSYS Workbench 10.0 (Swanson Analysis System). An oblique load (100 N) was applied to the palatine surface of the central incisor. The bone/implant interface was considered to be perfectly integrated. Values for the maximum (sigma(max)) and minimum (sigma(min)) principal stress, the equivalent von Mises stress (sigma(vM)), and the maximum principal elastic strain (epsilon(max)) for cortical and trabecular bone were obtained.Results: For the cortical bone, the highest sigma(max) (MPa) were observed for the RM (55.1), the RS (51.0), the SM (49.5), and the SS (44.8) models. The highest sigma(vM) (MPa) were found for the RM (45.4), the SM (42.1), the RS (38.7), and the SS models (37). The highest values for sigma(min) were found for the RM, SM, RS and SS models. For the trabecular bone, the highest sigma(max) values (MPa) were observed in the RS model (6.55), followed by the RM (6.37), SS (5.6), and SM (5.2) models.Conclusion: The hypothesis that the presence of microthreads and a switching platform would reduce the stress concentration in the cortical bone was partially rejected, mainly because the microthreads increased the stress concentration in cortical bone. Only platform switching reduced the stress in cortical bone. (C) 2012 Japan Prosthodontic Society. Published by Elsevier Ireland. All rights reserved.