In vitro biocompatibility evaluation of surface-modified titanium alloys

Area of Science:

• Biomaterials Science
• Materials Engineering
• Cell Biology

Background:

• Titanium alloys are crucial for biomedical applications.
• Vanadium-free titanium alloys offer potential alternatives due to biocompatibility concerns.
• Surface modification is key to optimizing implant performance.

Purpose of the Study:

• To evaluate the impact of thermal treatment on the biocompatibility of three vanadium-free titanium alloys (Ti-7Nb-6Al, Ti-13Nb-13Zr, Ti-15Zr-4Nb).
• To investigate the effect of surface modification on cellular responses.
• To correlate surface property changes with biological outcomes.

Main Methods:

• Alloys underwent thermal treatment at 750°C in air for varying durations.
• Untreated and treated alloys were cultured with Human Umbilical Vein Endothelial Cells (HUVEC) and Human Peripheral Blood Mononuclear Cells (PBMC).
• Tumor Necrosis Factor-alpha (TNF-alpha) release and cell adhesion molecule expression (ICAM-1, VCAM-1, LFA-1) were quantified.

Main Results:

• Thermal treatment significantly improved the biological response of the titanium alloys.
• Reduced TNF-alpha levels were observed in treated alloys, potentially linked to increased surface roughness from oxidation.
• PBMC exhibited greater sensitivity to the materials than HUVEC, with differential expression of adhesion molecules.

Conclusions:

• Thermal surface modification is an effective strategy to enhance the biocompatibility of vanadium-free titanium alloys.
• Surface roughness, composition, and corrosion resistance are critical factors influencing biological interactions.
• The findings support the use of these modified alloys in biomedical applications, with consideration for specific cell type responses.