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CaO-P2O5 glass hydroxyapatite double-layer plasma-sprayed coating: in vitro bioactivity evaluation
M P Ferraz1, F J Monteiro, J D Santos
1Departamento de Engenharia Metalúrgica, FEUP, Universidade do Porto, Portugal.
Journal of Biomedical Materials Research
|May 13, 1999
Summary
Double-layer composite coatings on titanium implants enhance bone integration by accelerating apatite layer formation. These advanced hydroxyapatite (HA) coatings show superior bioactivity compared to traditional HA coatings.
Area of Science:
- Biomaterials Science
- Surface Engineering
- Orthopedic Implants
Background:
- Titanium alloys (Ti-6Al-4V) are widely used in orthopedic implants.
- Enhancing the bioactivity of titanium implants is crucial for osseointegration.
- Hydroxyapatite (HA) coatings promote bone growth but can be improved.
Purpose of the Study:
- To develop and evaluate double-layer composite coatings for enhanced bioactivity on Ti-6Al-4V substrates.
- To compare the in vitro bioactivity of composite coatings with simple HA coatings.
- To characterize the apatite layer formed on the composite coatings.
Main Methods:
- Plasma-spraying technique to fabricate double-layer coatings (P2O5-based glass/HA top layer, HA underlayer).
- In vitro immersion testing in simulated body fluid (SBF).
- Surface analysis using Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), Atomic Absorption Spectroscopy (AAS), and Molybdenum Blue method.
Main Results:
- Composite coatings induced significantly faster Ca-P layer formation compared to pure HA coatings.
- SEM and XPS confirmed the formation of an apatite layer on the composite coatings.
- The apatite layer was identified as calcium-deficient hydroxyapatite with incorporated carbonate groups (Ca/P ratio 1.3-1.4).
Conclusions:
- Double-layer composite coatings exhibit enhanced in vitro bioactivity.
- The P2O5-based glass/HA composite coating accelerates apatite layer formation, crucial for implant osseointegration.
- These advanced coatings offer improved performance for orthopedic applications.
