4D PRINTED IMPLANTS FOR THE RECONSTRUCTION OF BONE DEFECTS IN CRANIOMAXILLOFACIAL SURGERY: THE EVOLUTION OF REGENERATIVE BIOENGINEERING

Biotechnology and regenerative engineering have advanced significantly in recent decades, resulting in remarkable innovations in the field of craniomaxillofacial surgery. One of the most promising advances is the development of 4D-printed implants, which represent a step up from traditional 3D implants. 4D printing involves creating materials that have the ability to change their properties and shapes over time, responding to environmental stimuli such as temperature and pH. These implants offer more dynamic and adaptable solutions for the reconstruction of bone defects, allowing for more efficient regeneration of affected tissues, especially in craniomaxillofacial surgeries. The use of 4D implants opens up new possibilities in the treatment of complex fractures, congenital deformities and traumatic injuries, bringing promising advances to regenerative medicine. Given this scenario, this study seeks to explore the evolution of regenerative bioengineering in the reconstruction of craniomaxillofacial bone defects, with an emphasis on 4D printing of implants and their potential to revolutionize surgical practice. Understanding the properties of these biomaterials and their clinical applications could lead to significant advances in personalized medicine, optimizing patient recovery and reducing post-operative complications. This study consists of a literature review with a qualitative approach, updating advances in 4D printing for biomedical applications, with a focus on bone regeneration and tissue engineering. The review covers studies published between 2021 and 2023, ensuring that the latest innovations are included. 4D printing in craniomaxillofacial surgery represents a notable advance over conventional implants, mainly due to the ability to adapt and integrate with the biological environment. The use of intelligent materials that adjust to the body after implantation offers a number of advantages, such as a reduction in the need for subsequent interventions and better adaptation of the implants to the regenerating tissues. Studies have shown that these 4D implants can improve bone healing, speed up the recovery process and minimize post-operative complications. However, challenges such as the durability of the materials, the complexity of the printing and the associated costs are still issues to be resolved. In addition, the need for more clinical studies to validate the long-term effectiveness of these technologies is crucial. It is concluded that 4D-printed implants for the reconstruction of bone defects in craniomaxillofacial surgery are at the forefront of regenerative medicine. Their ability to adapt and respond to the biological environment could revolutionize the way bone defects are treated, providing more effective and personalized solutions for patients. Although the outlook is promising, further clinical research and technological advances are needed to overcome challenges such as cost and durability in order to make these innovations widely accessible and viable for routine clinical use.