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Adherent octacalciumphosphate coating on titanium alloy using modulated electrochemical deposition method
Shujie Lin1, Racquel Z LeGeros, John P LeGeros
1Department of Biomaterials and Biomimetics, New York University College of Dentistry, 345 East 24th Street, New York, NY 10010, USA.
Journal of Biomedical Materials Research. Part A
|August 20, 2003
Summary
This study developed a modulated electrochemical deposition (MECD) method to create adherent octacalcium phosphate (OCP) coatings on titanium alloys. The OCP coatings showed good adhesion and transformed to carbonate hydroxyapatite (CHA) in simulated body fluid.
Area of Science:
- Biomaterials Science
- Materials Chemistry
- Electrochemistry
Background:
- Titanium alloys (Ti6Al4V) are widely used in biomedical implants.
- Developing robust and biocompatible coatings for titanium implants is crucial for enhancing osseointegration and longevity.
- Octacalcium phosphate (OCP) is a promising biomaterial for bone regeneration due to its structural similarity to bone mineral.
Purpose of the Study:
- To develop an electrochemical method for depositing adherent octacalcium phosphate (OCP) coatings on various titanium alloy (Ti6Al4V) substrates.
- To characterize the properties of the deposited OCP coatings, including composition, morphology, thickness, and dissolution behavior.
- To investigate the transformation of OCP coatings to carbonate hydroxyapatite (CHA) in simulated body fluid (SBF).
Main Methods:
- Modulated Electrochemical Deposition (MECD) using programmed pulse time electric fields.
- Coating deposition on Ti6Al4V substrates with diverse surface preparations (grit-blasted, chemically textured, arc-deposited, Co-Cr-beaded).
- Characterization techniques including X-ray diffraction (XRD), FT-IR, scanning electron microscopy (SEM), tensile strength tests, and solubility tests.
Main Results:
- Achieved highly adherent OCP coatings on Ti6Al4V with tensile strengths exceeding 7,000 psi on some surfaces.
- Demonstrated uniform OCP coating composition and morphology, with no shadowing in crevices on textured surfaces.
- Quantified OCP dissolution rates in Tris buffer at different pH levels and controlled crystal size via current density and pulse modulation.
Conclusions:
- MECD is an effective low-temperature method for producing uniform and adherent OCP coatings on Ti-alloy substrates.
- Optimizing MECD parameters (pulse modulation, pH, temperature, electrolyte) is key to successful OCP coating.
- OCP coatings readily transform into carbonate hydroxyapatite (CHA) when exposed to simulated body fluid (SBF).