Biomedical Engineering Reference
In-Depth Information
Figure 45.7.
SEM micrographs of sintered scaffolds: (a) general view of
PHBV scaffold, (b) close view of the strut surface of PHBV scaffold, (c) gen-
eral view of Ca-P/PHBV scaffold, and (d) close view of the strut surface of
Ca-P/PHBV scaffold.
bar-shapednanocompositescaffoldsand61.8
±
1.2%forrod-shaped
nanocompositescaffolds.Itisobviousthattheactualporosityvalues
ofallsinteredscaffoldswerehigherthanthetheoreticalporosityval-
ues, which is attributed to the presence of micropores on the strut
surface ofscaffolds.
The compressive strength and modulus of bar-shaped
Ca-P/PHBV nanocomposite scaffolds were 0.24
±
0.02 MPa and
3.96
±
0.64MPa,respectively,whichwerehigherthanthoseofPHBV
scaffolds (0.19
±
0.02 MPa for compressive strength and 2.38
±
0.29
MPa for modulus). For rod-shaped Ca-P/PHBV nanocomposite scaf-
folds,thecompressivestrengthandmodulusincreasedto2.20
±
0.18
MPa and 27.35
±
2.10 MPa, respectively. These results indicate that
with increasing strut size and decreasing pore size, the mechan-
ical properties of SLS-formed scaffolds could be improved. How-
ever, there is a limit for increasing the strut size and reducing the
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