[Comparative study of the titanium and titanium alloy implant electrolytic etching surface]

Area of Science:

• Biomaterials Science
• Materials Engineering
• Cell Biology

Background:

• Titanium and its alloys are widely used in biomedical implants due to their biocompatibility.
• Surface topography plays a crucial role in dictating cellular responses and osseointegration.
• Understanding the impact of micro-nano dimensional features on osteoblast behavior is essential for designing advanced implant surfaces.

Purpose of the Study:

• To investigate the in vitro effects of micro-nano dimensional topography on titanium and titanium alloy surfaces.
• To evaluate osteoblast adhesion, proliferation, morphology, and alkaline phosphatase (ALP) activity on different surface topographies.

Main Methods:

• Micro-nano dimensional titanium and titanium alloy surfaces were fabricated using the electrolytic etching (EE) method.
• Osteoblast responses including adhesion, proliferation, cell morphology, and ALP activity were assessed.
• Surface characterization was performed to analyze the resulting nanostructures.

Main Results:

• EE-treated titanium and titanium alloy surfaces showed enhanced osteoblast adhesion and proliferation compared to mechanical surfaces.
• Titanium surfaces displayed significant osteoblast coverage, extensive filopodia, and functional particle interaction.
• Osteoblasts cultured on pure titanium surfaces exhibited significantly higher ALP activity than those on titanium alloy and mechanical surfaces.

Conclusions:

• The EE method generates distinct bowl-like nests and nanostructures on pure titanium and titanium alloy surfaces.
• Pure titanium surfaces (30-50 μm diameter) are more effective in promoting osteoblast proliferation and differentiation than titanium alloy surfaces (5-8 μm diameter).
• Tailoring micro-nano topography via EE offers a promising strategy for enhancing the biological performance of titanium-based implants.