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首页> 外文期刊>The Journal of craniofacial surgery >Straight and angulated abutments in platform switching: Influence of loading on bone stress by three-dimensional finite element analysis
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Straight and angulated abutments in platform switching: Influence of loading on bone stress by three-dimensional finite element analysis

机译：平台切换中的直角基台：三维有限元分析对骨应力的影响

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摘要

Purpose: In view of reports in the literature on the benefits achieved with the use of platform switching, described as the use of an implant with a larger diameter than the abutment diameter, the goal being to prevent the (previously) normal bone loss down to the first thread that occurs around most implants, thus enhancing soft tissue aesthetics and stability and the need for implant inclination due to bone anatomy in some cases, the aim of this study was to evaluate bone stress distribution on peri-implant bone, by using three-dimensional finite element analysis to simulate the influence of implants with different abutment angulations (0 and 15 degrees) in platform switching. Methods: Four mathematical models of an implant-supported central incisor were created with varying abutment angulations: straight abutment (S1 and S2) and angulated abutment at 15 degrees (A1 and A2), submitted to 2 loading conditions (100 N): S1 and A1-oblique loading (45 degrees) and S2 and A2-axial loading, parallel to the long axis of the implant. Maximum (σ max) and minimum (σ min) principal stress values were obtained for cortical and trabecular bone. Results: Models S1 and A1 showed higher σ max in cortical and trabecular bone when compared with S2 and A2. The highest σ max values (in MPa) in the cortical bone were found in S1 (28.5), followed by A1 (25.7), S2 (11.6), and A2 (5.15). For the trabecular bone, the highest σ max values were found in S1 (7.53), followed by A1 (2.87), S2 (2.85), and A2 (1.47). Conclusion: Implants with straight abutments generated the highest stress values in bone. In addition, this effect was potentiated when the load was applied obliquely.
机译：目的：鉴于文献中关于使用平台切换所获得的好处的报道，该报道被描述为使用直径大于基台直径的植入物，目的是防止（以前的）正常骨丢失降低到出现在大多数植入物周围的第一根螺纹，从而在某些情况下增强了软组织的美观性和稳定性，并由于骨骼解剖结构而增加了植入物倾斜的需要，本研究的目的是通过使用三种方法评估植入物周围骨的骨应力分布维有限元分析，以模拟平台切换中具有不同基台角度（0度和15度）的种植体的影响。方法：创建具有不同基台角度的种植体支撑中央门牙的四个数学模型：直基台（S1和S2）和15度成角度的基台（A1和A2），并在2种加载条件（100 N）下分别受力：S1和A1斜向载荷（45度）以及S2和A2轴向载荷，平行于植入物的长轴。获得了皮质骨和小梁骨的最大（σmax）和最小（σmin）主应力值。结果：与S2和A2相比，模型S1和A1在皮质和小梁骨中显示出更高的σmax。在S1（28.5）中发现了皮质骨中的最高σmax（MPa），其次是A1（25.7），S2（11.6）和A2（5.15）。对于小梁骨，在S1（7.53）中发现最高的σmax值，其次是A1（2.87），S2（2.85）和A2（1.47）。结论：具有直基台的植入物在骨骼中产生最高的应力值。另外，当倾斜施加载荷时，这种效果得到加强。

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