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Fabrication of Mechanically Tunable and Bioactive Metal Scaffolds for Biomedical Applications
Published on: December 8, 2015
Bioactive polymer grafting onto titanium alloy surfaces
A Michiardi1, G Hélary, P-C T Nguyen
1Institute of Bioengineering of Catalonia (IBEC), Barcelona, Spain.
Acta Biomaterialia
|September 8, 2009
Summary
Bioactive polymers were grafted onto titanium alloy surfaces to improve biocompatibility. Styrene sodium sulfonate (NaSS) enhanced cell adhesion, while methylacrylic acid (MA)-NaSS polymers showed reduced bone formation in vivo.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Polymer Science
Background:
- Titanium alloys are widely used in orthopedic implants due to their mechanical properties.
- Enhancing the biocompatibility and osseointegration of titanium surfaces is crucial for improving implant success rates.
- Grafting bioactive polymers offers a promising strategy to modify surface properties and promote cellular interactions.
Purpose of the Study:
- To graft sulfonate and carboxylate-containing polymers onto Ti6Al4V alloy surfaces.
- To characterize the grafted polymer layers using advanced surface analysis techniques.
- To evaluate the in vitro cellular response and in vivo bone integration of the modified titanium surfaces.
Main Methods:
- Two-step surface modification: chemical oxidation followed by radical polymerization of styrene sodium sulfonate (NaSS) and methylacrylic acid (MA).
- Surface characterization using X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS).
- In vitro cell culture with human osteoblast-like cells and in vivo implantation in rabbit femora.
Main Results:
- Successful grafting of NaSS and MA-NaSS polymers confirmed by XPS and ToF-SIMS, with quantifiable polymer amounts (1-5 µg/cm²).
- NaSS-grafted surfaces exhibited significantly higher human osteoblast-like cell adhesion in vitro compared to ungrafted and MA-NaSS surfaces.
- In vivo studies showed direct bone contact for all implants, but MA-NaSS grafted implants had a lower percentage of mineralized tissue (47%) compared to NaSS (59%) and non-grafted (57%) implants.
Conclusions:
- Surface grafting of bioactive polymers is an effective method to modify Ti6Al4V alloy surfaces.
- NaSS grafting enhances early-stage cell adhesion, suggesting improved biocompatibility.
- The specific polymer composition (MA-NaSS) may negatively impact long-term bone integration, warranting further investigation into polymer design for orthopedic applications.
