Improvement of Mechanical Properties of 3D Bioprinted Structures Through Cellular Overgrowth

This study explores the enhancement of mechanical properties in 3D bioprinted structures using sodium alginate and gelatin hydrogels with NIH/3T3 fibroblast cells. Initially, these structures have low tensile strength, but over an 8-week incubation, cellular overgrowth significantly improves their mechanical properties. By week 6, a dense, interconnected cell network forms, increasing tensile strength nearly ninefold. However, by week 8, excessive cellular overgrowth and matrix degradation lead to a decline in mechanical properties. The study concludes that a 6-week cultivation period optimizes mechanical strength, making these structures suitable for biomedical applications like implants.