Enhanced in-vitro osteoblastic functions on β-type titanium alloy using surface mechanical attrition treatment

Area of Science:

• Biomaterials Science
• Surface Engineering
• Orthopedic Implants

Background:

• Titanium-based alloys are crucial for orthopedic implants due to their biocompatibility.
• Improving osseointegration, the direct contact between bone and implant, is key for implant success.
• Surface modification techniques are explored to enhance implant-bone integration.

Purpose of the Study:

• To investigate the effect of Surface Mechanical Attrition Treatment (SMAT) on a β-type titanium alloy (Ti-25Nb-3Mo-2Sn-3Zr).
• To evaluate the impact of SMAT on the surface properties and osseointegration potential of the titanium alloy.
• To determine if SMAT can improve osteoblast response for enhanced biomedical applications.

Main Methods:

• Ti-25Nb-3Mo-2Sn-3Zr alloy was subjected to Surface Mechanical Attrition Treatment (SMAT).
• Microstructural analysis using X-ray diffraction and transmission electron microscopy to assess grain refinement.
• Surface characterization including atomic force microscopy and hydrophilicity tests.
• In vitro cell culture studies with osteoblasts to evaluate cell adhesion, proliferation, differentiation, and mineralization.

Main Results:

• SMAT significantly refined the β phase grain size in the alloy's surface layer from approximately 110 μm to 26 nm.
• The SMAT-processed surface exhibited increased roughness and enhanced hydrophilicity compared to the untreated surface.
• SMAT promoted the adsorption of total proteins and specific anchoring proteins (vitronectin, fibronectin).
• Osteoblast adhesion, proliferation, differentiation, and extracellular mineralization were significantly improved on the SMAT-processed surface.

Conclusions:

• SMAT is an effective surface modification method for β-type titanium alloys.
• Grain refinement, increased surface roughness, and hydrophilicity induced by SMAT enhance osseointegration.
• SMAT offers a promising approach for developing advanced biomedical implants with improved biological performance.