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Progress in Surface Modification of Titanium Implants by Hydrogel Coatings
Huangqin Chen1, Rui Feng1, Tian Xia1
1Department of Stomatology, School of Stomatology and Ophthalmology, Xianning Medical College, Hubei University of Science and Technology, Xianning 437100, China.
Gels (Basel, Switzerland)
|May 26, 2023
Summary
Hydrogel coatings enhance titanium implants by fixing biomolecules to improve biological interactions. This review covers materials, methods, and benefits like better osseointegration and antibacterial effects for medical implants.
Area of Science:
- Biomaterials Science
- Surface Engineering
- Medical Implant Technology
Background:
- Titanium and its alloys are preferred for medical implants, but their surfaces require modification for complex physiological environments.
- Biochemical modification, specifically hydrogel coatings, offers a superior approach compared to physical or chemical methods.
- Hydrogel coatings can immobilize biomolecules to directly engage in biological processes and enhance implant bioactivity.
Purpose of the Study:
- To review common substrate materials for hydrogel coatings on implant surfaces.
- To introduce prevalent construction methods for hydrogel coatings.
- To detail the enhancements hydrogel coatings provide to titanium and titanium alloy implant bioactivity.
Main Methods:
- Review of natural (collagen, gelatin, chitosan, alginate) and synthetic (polyvinyl alcohol, polyacrylamide, polyethylene glycol, polyacrylic acid) polymer substrates.
- Discussion of hydrogel coating construction techniques: electrochemical, sol-gel, and layer-by-layer self-assembly.
- Analysis of hydrogel coating effects on osseointegration, angiogenesis, macrophage polarization, antibacterial properties, and drug delivery.
Main Results:
- Hydrogel coatings effectively immobilize diverse biomolecules on implant surfaces.
- Various natural and synthetic polymers serve as suitable substrates for hydrogel coatings.
- Established methods like electrochemical, sol-gel, and layer-by-layer assembly are viable for hydrogel coating fabrication.
- Hydrogel coatings significantly improve osseointegration, angiogenesis, macrophage polarization, antibacterial efficacy, and drug delivery capabilities.
Conclusions:
- Hydrogel coatings represent a promising strategy for surface modification of titanium and titanium alloy implants.
- These coatings enhance implant biological activity by facilitating direct interaction with biological molecules and processes.
- Future research should focus on optimizing hydrogel coating strategies for advanced medical implant applications.
