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Characterization of surface oxide films on titanium and bioactivity
1Engineering Research Center in Biomaterials, Sichuan University, Chengdu 610064, China. fengbh@263.net
Journal of Materials Science. Materials in Medicine
|September 7, 2004
Summary
Heat-treatment enhances titanium implant bioactivity by modifying its surface oxide film. This process increases surface hydroxyl groups and energy, promoting apatite formation and improving biological properties for better osseointegration.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Materials Engineering
Background:
- The biological performance of titanium implants is critically dependent on the properties of their surface oxide film.
- Understanding the relationship between surface characteristics and bioactivity is essential for developing improved dental and orthopedic implants.
Purpose of the Study:
- To characterize surface oxide films on titanium after heat-treatment in various oxidation atmospheres.
- To investigate the correlation between surface properties (roughness, energy, composition, crystal structure) and the bioactivity of titanium.
- To determine the influence of surface modifications on apatite formation in a simulated physiological environment.
Main Methods:
- Titanium plates were heat-treated in air, oxygen, and water vapor atmospheres.
- Surface characterization included profilometry, scanning electron microscopy, contact angle measurements, X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD).
- Bioactivity was assessed via immersion testing in a supersaturated calcium phosphate solution, followed by analysis of apatite coating formation.
Main Results:
- Heat-treatment uniformly roughened titanium surfaces and increased surface energy.
- The predominant surface oxide was rutile TiO(2), with preferential (1 1 0) crystal plane orientation.
- Heat-treatment increased surface hydroxyl groups (both acidic and basic) and promoted spontaneous apatite formation on rutile films, indicating bioactivation.
Conclusions:
- The surface characteristics of titanium, particularly the presence of rutile TiO(2) with specific crystal orientation, significantly influence its bioactivity.
- Bioactivity is strongly correlated with surface energy and the density of both acidic and basic surface hydroxyl groups.
- Heat-treatment is an effective method to enhance titanium implant bioactivity by optimizing surface properties for improved osseointegration.