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Bioactive hydroxyapatite coatings on polymer composites for orthopedic implants.
C Auclair-Daigle1, M N Bureau, J-G Legoux
1Groupe de Recherche en Biomécanique et Biomatériaux, Ecole Polytechnique, C.P. 6079, Succ. Centre-Ville, Montréal, Canada, H3C 3A7.
Journal of Biomedical Materials Research. Part A
|May 14, 2005
Summary
Plasma-sprayed hydroxyapatite (HA) coatings on polymer composites show excellent bioactivity. These HA coatings are suitable for orthopedic applications, maintaining mechanical integrity after simulated body fluid immersion.
Area of Science:
- Biomaterials Science
- Orthopedic Engineering
- Materials Science
Background:
- Hydroxyapatite (HA) is crucial for orthopedic applications, particularly for coating hip replacement components.
- Polymer composite substrates offer potential for biomedical devices.
Purpose of the Study:
- To investigate the bioactivity and physicochemical characteristics of hydroxyapatite coatings on polymer composite substrates.
- To evaluate the mechanical properties and stability of HA coatings after simulated body fluid immersion.
Main Methods:
- Plasma spraying was used to deposit HA onto carbon fiber/polyamide 12 composite substrates.
- Samples were immersed in simulated body fluid (SBF) for up to 28 days at 37°C.
- Characterization included SEM, EDS, XRD, and ICP-AES analysis of SBF.
Main Results:
- HA coatings achieved mechanical adhesion up to 23 MPa.
- SBF immersion resulted in the deposition of crystalline HA on the coating surface.
- Calcium-to-phosphorous ratios of initial and newly deposited HA were close to the theoretical value.
- Mechanical adhesion remained largely unaffected by SBF conditioning.
Conclusions:
- Plasma spraying successfully produced bioactive HA coatings on polymer composite substrates.
- The developed HA coatings exhibit high crystallinity and stability, suitable for orthopedic applications.
- The bioactivity was confirmed by the formation of new HA layers in SBF.