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Heterogeneous synthesis of fluoridated hydroxyapatites
1Department of Dental Technology, Osaka University, Faculty of Dentistry, Japan.
Biomaterials
|January 1, 1992
Summary
Synthesizing fluoridated hydroxyapatites using different fluoride supply orders created distinct materials. These materials, though similar in fluoride content, exhibited different physical properties and surface characteristics, suggesting unique structural formations.
Area of Science:
- Materials Science
- Biomaterials Science
- Chemistry
Background:
- Hydroxyapatite is a key component of bone and teeth.
- Fluoride incorporation into hydroxyapatite can enhance its properties, such as acid resistance.
- Understanding the synthesis of fluoridated hydroxyapatites is crucial for developing improved dental and bone materials.
Purpose of the Study:
- To investigate the synthesis of fluoridated hydroxyapatites using two distinct sequential fluoride supply methods.
- To characterize the physico-chemical properties of the resulting materials.
- To determine if the order of fluoride supply influences the final structure and properties.
Main Methods:
- Heterogeneous synthesis of fluoridated hydroxyapatites with reversed fluoride solution supply orders.
- X-ray diffraction (XRD) for structural analysis.
- Solubility tests at 37°C and pH 4.0.
- Wavelength dispersive spectroscopy (WDS) and electron spectroscopy for chemical analysis (ESCA) for surface and elemental composition.
Main Results:
- Both synthesis methods yielded fluoridated hydroxyapatites with typical calcium phosphate XRD patterns and similar total fluoride content.
- Significant differences in apparent solubility were observed between the two materials.
- XRD peak broadening and surface fluoride signals varied, indicating distinct structural and surface characteristics.
- WDS and ESCA analyses revealed differences in elemental distribution and surface fluoride presence.
Conclusions:
- The order of fluoride supply during heterogeneous synthesis significantly impacts the physico-chemical properties of fluoridated hydroxyapatites.
- Two distinct types of fluoridated hydroxyapatites are formed: hydroxyapatite coated with fluorapatite and fluorapatite coated with hydroxyapatite.
- These findings highlight the importance of controlled synthesis for tailoring the properties of fluoridated hydroxyapatites for specific applications.