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Laser powder bed fusion-built Ti6Al4V bone scaffolds composed of sheet and strut-based porous structures: Morphology, mechanical properties, and biocompatibility

Ma, Shuai, Tang, Qian, Zhu, Changbao, Wang, Fuyou, Feng, Qixiang, Song, Jun, Setchi, Rossitza ORCID:, Ma, Chenglong and Tao, Ran 2022. Laser powder bed fusion-built Ti6Al4V bone scaffolds composed of sheet and strut-based porous structures: Morphology, mechanical properties, and biocompatibility. Chinese Journal of Mechanical Engineering: Additive Manufacturing Frontiers 1 (4) , 100051. 10.1016/j.cjmeam.2022.100051

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Laser powder bed fusion (L-PBF)-built triply periodic minimal surface (TPMS) structures are designed by implicit functions and are endowed with superior characteristics, such as adjustable mechanical properties and light-weight features for bone repairing; thus, they are considered as potential candidates for bone scaffolds. Unfortunately, previous studies have mainly focused on different TPMS structures. The fundamental understanding of the differences between strut and sheet-based structures remains exclusive, where both were designed by one formula. This consequently hinders their practical applications. Herein, we compared the morphology, mechanical properties, and biocompatibility of sheet and strut-based structures. In particular, the different properties and in vivo bone repair effects of the two structures are uncovered. First, the morphology characteristics demonstrate that the manufacturing errors of sheet-based structures with diverse porosities are comparable, and semi-melting powders as well as the ball phenomenon are observed; in comparison, strut-based samples exhibit cracks and thickness shrinking. Second, the mechanical properties indicate that the sheet-based structures have a greater elastic modulus, energy absorption, and better repeatability compared to strut-based structures. Furthermore, layer-by-layer fracturing and diagonal shear failure modes are observed in strut-based and sheet-based structures, respectively. The in vivo experiment demonstrates enhanced bone tissues in the strut-based scaffold. This study significantly enriches our understanding of TPMS structures and provides significant insights in the design of bone scaffolds under various bone damaging conditions.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Additional Information: License information from Publisher: LICENSE 1: URL:, Start Date: 2022-11-18
Publisher: Elsevier
ISSN: 2772-6657
Date of First Compliant Deposit: 22 November 2022
Date of Acceptance: 13 September 2022
Last Modified: 05 Jan 2024 05:40

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