Biocompatibility pathways and mechanisms for bioactive materials: The bioactivity zone.

Area of Science:

• Biomaterials Science
• Materials Chemistry
• Tissue Engineering

Background:

• Bioactivity is crucial for biomaterial performance, influencing interactions with host tissue.
• Understanding the interfacial region, termed 'the bioactivity zone,' is key to bioactivity phenomena.
• Existing research demonstrates potential but highlights barriers to clinical translation.

Purpose of the Study:

• To analyze scientific evidence underpinning bioactive materials.
• To correlate bioactivity phenomena with biomaterial biocompatibility mechanisms.
• To assess performance in bone induction, cell adhesion, immunomodulation, thrombogenicity, and antimicrobial behavior.

Main Methods:

• Review of scientific literature on bioactive materials and biocompatibility.
• Analysis of interfacial phenomena ('bioactivity zone') in biomaterials.
• Examination of topographical/micromechanical and biologically active species effects.

Main Results:

• Bioactivity is modulated by the material's interfacial region and local host tissue.
• Topographical/micromechanical effects include osteoblast-osteoclast balance modulation and nanotopographical cell adhesion regulation.
• Biologically active species, like metal ions and peptides, influence signaling pathways and cell attachment.

Conclusions:

• Solid scientific evidence supports bioactivity mechanisms in specific biomaterials.
• Material modification can be designed to specifically induce desired bioactivity.
• Further research is needed to overcome clinical translation barriers for bioactive materials.