Additive Manufacturing in tissue engineering: Advances in bioinks, scaffold design, and regenerative therapies

Abstract

Additive manufacturing (AM), commonly referred to as 3D printing, has emerged as a

transformative technology in tissue engineering, enabling the fabrication of complex, patient-specific scaffolds

with precise control over architecture, porosity, and material composition. This review highlights recent

advances in bioinks, scaffold design, and regenerative therapies, emphasizing their critical role in promoting

cellular proliferation, differentiation, and tissue maturation. Natural, synthetic, and hybrid bioinks are

discussed, focusing on their printability, biocompatibility, and incorporation of bioactive cues. Scaffold design

strategies, including structural optimization, biomimetic architectures, and functionalization with growth

factors or nanoparticles, are examined for their capacity to enhance mechanical performance and tissue

integration. Applications in bone, cartilage, skin, cardiovascular, and neural regeneration are reviewed,

demonstrating the potential of AM to address complex tissue defects. Current challenges, such as limited

vascularization, cell viability, mechanical constraints, and regulatory hurdles, are also analyzed. Finally, future

perspectives emphasize the integration of smart materials, 4D bioprinting, and AI-assisted design to achieve

patient-specific, multifunctional, and clinically translatable tissue constructs. Collectively, this review

provides a comprehensive overview of AM’s role in advancing regenerative medicine and highlights emerging

trends toward personalized and effective tissue therapies.