3D printing of physical objects and structural parameters. (A) Physical images of uniform gradient scaffolds and dual gradient scaffolds prepared by selective laser melting (SLM). (B, C) Definition of body-centered cubic (BCC) and I-Wrapped Package (IWP) aperture. (D) The trend of pore size variation of two types of cells under different volume fractions. (E) Changes in surface area, volume, and ratio of two types of cells under different volume fractions.

Bone defect is a common clinical disease. Due to the uncertainty of trauma or infection areas, customized size features are often required for bone substitutes. By inspiration of the natural bone structure, this study designs porous scaffolds with a biomimetic design perspective by using different inner and outer pore units. The outer pore units adopt body-centered cubic (BCC) structure to simulate the weight-bearing function of human cortical bone, while inner pore units using I-Wrapped Package structure, a kind of three periods minimum surface, to obtain a good permeability and simulates the inner layer of cancellous bone. To further regulate the overall modulus of the scaffold within the range of natural bone modulus in the human body, the scaffold was designed to axial gradient structure. Compression experiments were conducted, and the results indicated that when the volume fraction linearly increased from 20% to 50%, the Young's modulus was close to the cortical bone modulus in the human body. In vitro cell experiments further proved that osteoblasts have good cellular activity and spreading morphology on the surface of this scaffold. The customized 3D-printed heterogeneous porous titanium scaffold has great application potential in bone tissue engineering.

Article Access: https://doi.org/10.1002/mba2.80

More about MedComm-Biomaterials and Applications: https://onlinelibrary.wiley.com/journal/2769643x

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