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J Mech Behav Biomed Mater. 2018 Dec;88:478-487. doi: 10.1016/j.jmbbm.2018.08.048. Epub 2018 Aug 30.

Effect of pore geometry on the fatigue properties and cell affinity of porous titanium scaffolds fabricated by selective laser melting.

Author information

1
State Key Lab of Materials Processing and Die & Mould Technology, School of Materials, Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
2
Dept. Stomatol., Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
3
State Key Lab of Materials Processing and Die & Mould Technology, School of Materials, Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. Electronic address: wqs_xn@163.com.
4
Dept. Stomatol., Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China. Electronic address: zhangzhentitanium@163.com.

Abstract

Porous titanium scaffolds with different unit cell type (tetrahedron and octahedron) and pore size (500 µm and 1000 µm) were fabricated by selective laser melting (SLM), and the effects of unit cell type and pore size on their fatigue properties and cell affinity were studied. The fatigue properties were performed by static and dynamic mechanical testing, while the cell affinity was evaluated in vitro with mouse osteoblast cells. It was found that octahedron scaffolds exhibited superior static mechanical properties, longer fatigue lives and higher fatigue strength in comparison to those of tetrahedron ones. As expected, scaffolds with 1000 µm pore resulted in lower compressive properties and shorter fatigue lives compared to those with 500 µm pore. The differences were analyzed based on the unit cell structure, porosity, and manufacturing imperfections. Scanning electron microscopy (SEM) and immunofluorescence showed that cells spread better on octahedron scaffolds than those on tetrahedron ones. Meanwhile, the scaffolds with 1000 µm pore were more suitable for cell attachment and growth within the same unit cell owing to higher porosity. The comparison of different pore geometry on the mechanical and biological property provided further insight into designing an optimal porous scaffold.

KEYWORDS:

Cell affinity; Fatigue property; Pore geometry; Porous titanium scaffold; Selective laser melting

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