Page 218 - IJB-10-2

International Journal of Bioprinting Property of scaffolds with different lattices

If D is equal to 600 μm, d is equal to 300 μm, then a will d 2 d
2
2
2
be 1.102 mm. In addition, the relationship between P , d , P 247 39 3 83 911 3 104 95 (V)
.
.
.
3
2
2
and a was computed using a fitting approach. Porosity of a 3 a 3
2
unit cell is expressed in Equation IV. where a represents the size of the unit cell, and d denotes
3
3
the size of the rod. If P is set to 66%, d /a will be 0.26. The
d 2 3 3 3
P 318 17 2 96 185. (IV) relation between d , D , and a is expressed in Equation VI.
.
3
3
3
2
a 2
Both porosity (P ) and pore size (D ) are the import D 2 5 a d 3 (VI)
3
2
3
2
parameters on our software. Therefore, the diameter of 5
the rod is variable. In this study, the demand porosity We also set the pore size D to 600 μm. Each parameter was
3
and pore size were 66% and 600 μm, respectively. Finally, computed, as depicted in Table 1. The demand models are
the parameters of the diamond lattice were calculated, as illustrated in Figure 1B.
illustrated in Table 1. The demand models are depicted in
Figure 1B. 2.2. Fabrication and test of the porous
Ti6Al4V scaffold
2.1.3. Cuboctahedron lattice The designed 3D models of the different unit cell
The unit cell of the cuboctahedron lattice structure is structures were fabricated into Ti6Al4V scaffolds by
displayed in Figure 1A. Its dimensions mirrored those means of selective laser melting (A320, BLT, China)
of the envelope box. Additionally, the pore size (D ) was (Figure 2). To maximize the processing precision, we
3
determined as the diameter of the unit cell’s inner ball. The configured the printing parameters as follows: 80 W laser
relation of the porosity P , d , and a was calculated using power, 200 mm/s scanning speed, 60 μm pitch, and 20 μm
3
3
3
a fitting technique. Porosity of the unit cell is expressed in powder thickness. After spraying gold on the scaffolds,
Equation V. we observed the surface morphology of the scaffolds

Figure 2. Ti6Al4V porous scaffolds (Φ10 mm × 10 mm) with three different unit cell structures fabricated by SLM technique.

Volume 10 Issue 2 (2024) 210 doi: 10.36922/ijb.1698