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Long-term changes of hydroxyapatite-coated dental implants
I Baltag1, K Watanabe, H Kusakari
1Department of Fixed Prosthodontics, Faculty of Dentistry, Niigata University, Niigata, Japan. ibaltag@dent.niigata-u.ac.jp
Journal of Biomedical Materials Research
|January 15, 2000
Summary
Hydroxyapatite (HA)-coated implants showed coating loss and changes in composition and structure after implantation. These alterations, including ion substitutions, were observed but not definitively linked to implant failure in this study.
Area of Science:
- Biomaterials Science
- Dental Implantology
- Materials Science
Background:
- Long-term prognosis of hydroxyapatite (HA)-coated implants remains debated.
- Implant failure may stem from degradation of the HA coating post-implantation.
Purpose of the Study:
- To investigate the morphology, composition, and structure of HA coatings on retrieved dental implants.
- To characterize changes in HA coatings after implantation and assess their relationship to implant performance.
Main Methods:
- Analysis of retrieved and unused HA-coated blade-type implants.
- Techniques included stereomicroscopy, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and electron probe microanalysis (EPMA).
Main Results:
- Retrieved implants exhibited partial coating loss, particularly at edges.
- HA coatings showed morphological changes (flattening, roughening) and compositional alterations (increased Cl, Mg; decreased OH) in retrieved implants.
- XRD indicated peak broadening, suggesting increased lattice imperfections in retrieved HA coatings.
Conclusions:
- Morphological and compositional changes in HA coatings occur after implantation, influenced by biomechanical factors.
- Ion substitutions contribute to lattice imperfections in retrieved HA coatings.
- The direct impact of these observed coating changes on implant failure could not be confirmed in this investigation.