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Facemask performance during maxillary protraction: a finite element analysis (FEA) evaluation of load and stress distribution on Delaire facemask

机译:上颌牵引过程中的面罩性能:Delaire面罩上载荷和应力分布的有限元分析(FEA)评估

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摘要

BackgroundTo evaluate load and stress distribution on Delaire facemask (FM) during maxillary protraction in class III growing patients by means of finite element analysis (FEA). A three-dimensional geometry of a Delaire FM was reconstructed from the original CAD 3D prototype, using software package (ANSYS 5.7). FM presented forehead and chin supports and stainless steel framework characterized by two lateral vertical bars connected to a crossbar with two pawls for elastic attachment. Two traction intensities (7.8 and 9.8 N) were applied on the FM pawls along three different downward inclined directions with respect to the occlusal plane (0°, 30°, or 50°, respectively). Resulting stresses and deformations were then tested through the von Mises yield criterion in order to underline the FM wear performance.
机译:背景技术通过有限元分析(FEA)评估III型成长患者上颌前伸过程中Delaire面罩(FM)的负荷和应力分布。使用软件包(ANSYS 5.7)从原始CAD 3D原型重构了Delaire FM的三维几何形状。 FM展示了前额和下巴支撑以及不锈钢框架,其特征是两个横向垂直杆连接到带有两个用于弹性连接的棘爪的横杆。沿相对于咬合面(分别为0°,30°或50°)的三个不同的向下倾斜方向,在FM棘爪上施加了两个牵引强度(7.8和9.8N)。然后通过von Mises屈服准则测试所产生的应力和变形,以强调FM磨损性能。

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