Bioactive Glass Coatings in Biomedical Implants

Bioactive glass coatings have emerged as a transformative advancement in the design of biomedical implants, marrying the mechanical resilience of metallic substrates with the tissue-regenerative capability of glass compositions. Upon implantation, these coatings establish a direct chemical bond with bone and, in some formulations, with soft tissues by forming a surface layer of hydroxyapatite, mimicking the mineral phase of bone. Beyond mere adhesion, many bioactive glass systems are engineered to release therapeutic ions—such as calcium, phosphate, silicon and trace elements like zinc or strontium—to stimulate osteogenesis, angiogenesis and antimicrobial defence. This ion-mediated modulation of the cellular microenvironment accelerates osseointegration and reduces the risk of infection, thereby enhancing long-term implant success. A spectrum of deposition methods, including thermal spraying, pulsed laser deposition, electrophoretic deposition and magnetron sputtering, has been developed to produce uniform, adherent coatings on substrates such as titanium alloys. Current research seeks to optimise glass composition, microstructure and coating thickness to achieve a balance between bioactivity, mechanical integrity and controlled dissolution. The global significance of this work lies in its potential to improve outcomes in orthopaedics, dental implants and load-bearing devices, reducing revision surgeries and advancing patient quality of life.

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Bioactive Glass Coatings in Biomedical Implants publication trend

The graph below shows the total number of articles in bioactive glass coatings in biomedical implants across all publications each year (not limited to Nature Index journals).

Technical terms

Bioactive glass: An amorphous silica-based material that forms a strong chemical bond with living tissues by precipitating a bone-like hydroxyapatite layer on its surface.

Magnetron sputtering: A physical vapour deposition technique in which ions dislodge atoms from a glass target to form a thin, uniform coating on a substrate.

Osteointegration: The process by which an implant becomes firmly anchored to bone through new bone formation at the interface.

Therapeutic ions: Bioregulatory elements (for example, Ca2+, Si4+, Zn2+, Sr2+) incorporated into glass that, upon release, stimulate cellular responses such as proliferation, differentiation and antimicrobial defence.

Hydroxyapatite: A calcium phosphate mineral (Ca10(PO4)6(OH)2) that closely resembles the inorganic component of bone and whose formation on implant surfaces is indicative of successful bioactivity.

References

1. Two decades of continuous progresses and breakthroughs in the field of bioactive ceramics and glasses driven by CICECO-hub scientists. Bioactive Materials (2024).
2. Critical advances in the field of magnetron sputtered bioactive glass thin-films: An analytical review. Applied Surface Science (2024).
3. Modification of titanium orthopedic implants with bioactive glass: a systematic review of in vivo and in vitro studies. Frontiers in Bioengineering and Biotechnology (2023).
4. A Comprehensive Review of Bioactive Glass Coatings: State of the Art, Challenges and Future Perspectives. Coatings (2020).