Department of Engineering, University of Messina, Contrada di Dio, Vill. Sant'Agata, 98166, Messina, Italy.
Mt Ortho srl, via fossa lupo sn, Aci Sant'Antonio, 95025, Catania, Italy.
J Mech Behav Biomed Mater. 2023 Feb;138:105656. doi: 10.1016/j.jmbbm.2023.105656. Epub 2023 Jan 4.
In this research, a new lattice structure based on the octagonal geometry and produced by Additive Manufacturing (AM) technique was proposed. Eight octagons with the same dimensions are combined to each other forming a ring. To obtain an isotropic lattice structure, cubic symmetry was imposed; thus, the unit cell is made of three rings mutually perpendicular, one ring for each principal direction. The aim of this study is the morphological and mechanical characterization of the novel unit cell to check its suitability to the biomechanical field, along with its comparison with other lattice structures currently used as bone scaffold. Electron Beam Melting (EBM) technique was used to produce Ti6Al4V ELI alloy specimens of the novel unit cell and of the truncated octahedron (Kelvin) cell. Three different unit cell sizes were selected to investigate the effect of cell dimensions on the mechanical properties. Morphological analysis was performed through a scanning electron microscope (SEM), to compare the actual structures to the designed ones. On the whole, the new lattice structure provided adequate mechanical properties to be considered as a bone substitute; further tests will be focused on its osteointegration capability.
在这项研究中，提出了一种基于八边形几何形状并通过增材制造（AM）技术生产的新型晶格结构。八个相同尺寸的八边形相互组合形成一个环。为了获得各向同性的晶格结构，施加了立方对称性；因此，单元由三个相互垂直的环组成，每个主方向一个环。本研究的目的是对新型单元的形态和力学特性进行表征，以检查其在生物力学领域的适用性，并将其与目前用作骨支架的其他晶格结构进行比较。电子束熔化（EBM）技术用于制造新型单元和截角八面体（开尔文）单元的 Ti6Al4V ELI 合金试样。选择了三种不同的单元尺寸来研究单元尺寸对机械性能的影响。通过扫描电子显微镜（SEM）进行形态分析，将实际结构与设计结构进行比较。总的来说，新型晶格结构提供了足够的机械性能，可以考虑作为骨替代物；进一步的测试将集中在其骨整合能力上。
