Page 540 - IJB-9-6

International Journal of Bioprinting High-performance SrCS scaffolds via vat photopolymerization

Figure 8. (a) Stress–strain curves, (b) compressive strength, (c) elasticity modulus, and (d) energy absorption of the bioceramic scaffolds with different
SrCS-BTA components.

pinning effect . This leads to the enhanced mechanical 3.4. Micromorphology and mechanical properties
[54]
properties of SrCS-BTA composite scaffolds at the macro after in vitro degradation
level. More specifically, with the further increase of BTA After in vitro degradation, the surface microtopography of
content, the concentration of TiO-2 3 from BTA increased the SrCS scaffold changed significantly (shown in Figure
during the high-temperature sintering. The newly CaTiO 3 10). After soaking for 4 days, the originally dense grain
grains were formed and pinned between CaSiO grains boundaries were eroded into larger gaps, which then
3
(as mentioned above), which could effectively hinder the bonded with each other and were deeply eroded to form
movement of the grains and crack extension, resulting micropores on the 7th day. After soaking for 14 days,
in significant improvement in mechanical properties, as broken pores were observed with the breakage of grains.
shown in Figure 9. On the other hand, pure SrCS scaffolds On the contrary, doping BTA make composite scaffolds
without CaTiO phase such as nails and cracks could easily maintain the surface microtopography during soaking.
3
pass through the CaSiO grains, leading to the scaffold After a 14-day soaking period, the composite scaffolds
3
failure during compression.

Figure 9. Schematic illustration of enhancement mechanism of mechanical properties of the SrCS-BTA composite scaffolds.

Volume 9 Issue 6 (2023) 532 https://doi.org/10.36922/ijb.1233