A Comparative Study of a 3D Bioprinted Gelatin-Based Lattice and Rectangular-Sheet Structures.

3D bioprinting holds great promise in the field of regenerative medicine as it can create complex structures in a layer-by-layer manner using cell-laden bioinks, making it possible to imitate native tissues. Current bioinks lack both high printability and biocompatibility required in this respect. Hence, the development of bioinks that exhibit both properties is needed. In our previous study, a furfuryl-gelatin-based bioink, crosslinkable by visible light, was used for creating mouse mesenchymal stem cell-laden structures with a high fidelity. In this study, lattice mesh geometries were printed in a comparative study to test against the properties of a traditional rectangular-sheet. After 3D printing and crosslinking, both structures were analysed for swelling and rheological properties, and their porosity was estimated using scanning electron microscopy. The results showed that the lattice structure was relatively more porous with enhanced rheological properties and exhibited a lower degradation rate compared to the rectangular-sheet. Further, the lattice allowed cells to proliferate to a greater extent compared to the rectangular-sheet, which initially retained a lower number of cells. All of these results collectively affirmed that the lattice poses as a superior scaffold design for tissue engineering applications.