Scaffolds for Bone Regeneration
Abstract
Regenerative medicine, and particularly tissue engineering, has emerged in recent years as a potential alternative solution to tissue transplantation and grafting. Tissue engineering covers the repair and regeneration of organs and tissues using the triad of cells, biochemical signals and scaffolds. in this area, the design of 3D temporary supports that carefully consider the most influential factors in the regeneration process is required. This article provides a complete overview of the most common currently used biomaterials and techniques for the fabrication of 3D porous structures, and also considers the different approaches used to enhance bone regeneration.scaffolds, tissue engineering, bone, biomaterials, 3D porous structures
Tissue regeneration and regenerative medicine in general have appeared in recent years as the best solution to a large number of organic malfunctions, diseases or trauma. Tissue engineering has emerged as a potential alternative solution to tissue transplantation and grafting. Allografts, autografts and xenografts present several known limitations, such as donor-site scarcity, rejection, disease transfer, harvesting costs and post-operative morbidity.1–3 Both tissue engineering and regenerative medicine look at the repair and regeneration of organs and tissues using natural signalling pathways and components such as stem cells, growth factors and peptide sequences, among others, in combination with synthetic scaffolds, which usually consist of degradable biomaterials.4 Probably the key issue when trying to engineer the regeneration process is comprehension of the dialogue between cells and their microenvironment. The basis for this comprehension is that environmental biochemical and biophysical cues and signals are translated by cells into intracellular commands that activate specific events in response to such signals and that make cells modify their behaviour to react with appropriate responses. of the multiple elements that participate in this dialogue and affect the regenerative process, it is necessary to consider the following:
- transport of oxygen, electrolytes, nutrients and molecules to the cells;
- cell migration and mobility towards the regeneration site and within it;
- the metabolic environment that will be responsible for the degradation of the implanted devices;
- cell–material interactions, where material surface properties have a direct and strong effect on cell behaviour;
- biochemical and biophysical stimuli from the microenvironment, such as chemical cues or mechanical stimuli that can regulate cell behaviour;
- angiogenesis control, which is essential for the regeneration of the tissue in vivo;
- immunological and inflammatory response; and
- cell behaviour, including attachment, proliferation and differentiation into the right lineage.
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