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Heterogeneous fluoridated hydroxyapatites partially substituted with fluoride ions
M Okazaki1, M Taira, J Takahashi
1Department of Dental Materials Science and Technology, Osaka University Faculty of Dentistry, Japan.
Bio-Medical Materials and Engineering
|January 1, 1997
Summary
Synthesizing partially fluoridated apatites revealed distinct structural differences. These findings differentiate between hydroxyapatite coated with fluorapatite and vice versa, impacting material properties.
Area of Science:
- Materials Science
- Crystallography
- Biomaterials
Background:
- Hydroxyapatite and fluorapatite are crucial calcium phosphate biomaterials.
- Understanding heterogeneous substitution is key to tailoring apatite properties.
- Previous work suggested distinct structures for partially fluoridated apatites.
Purpose of the Study:
- To synthesize and characterize two types of partially substituted fluoridated apatites.
- To investigate the structural and compositional differences between H-FHAp0.5 and FH-HAp0.5.
- To provide evidence for distinct heterogeneous fluoridation mechanisms in apatites.
Main Methods:
- Heterogeneous synthesis of H-FHAp0.5 and FH-HAp0.5 by controlled fluoride addition.
- X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) for structural analysis.
- High-resolution electron microscopy (HREM) and Energy Dispersive Spectroscopy (EDS) for detailed morphology and elemental composition.
Main Results:
- XRD and SEM showed no significant differences between H-FHAp0.5 and FH-HAp0.5.
- HREM revealed distinct morphologies: elongated hexagons for H-FHAp0.5 and wider hexagons for FH-HAp0.5.
- EDS indicated higher fluoride intensity in H-FHAp0.5 compared to FH-HAp0.5.
Conclusions:
- The synthesis produced two distinct types of heterogeneous fluoridated hydroxyapatites.
- Morphological and compositional differences support the models of hydroxyapatite-coated fluorapatite (H-FHAp0.5) and fluorapatite-coated hydroxyapatite (FH-HAp0.5).
- These findings clarify the mechanisms of heterogeneous fluoridation in apatite synthesis.