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Crystallographic Morphology of Heterogeneous Fluoridated Carbonate Apatites

Department of Dental Technology, Osaka University Faculty of Dentistry, 1-8, Yamadaoka, Suita, Osaka 565, Japan

Carbonate-containing fluoridated apatites were synthesized with two different modes of fluoride incorporation: by supplying F-free solution initially, followed by a F-containing solution; and with the order of supply of these solutions reversed. Both of these heterogeneously synthesized fluoridated CO₃ apatites showed typical apatitic x-ray diffraction patterns; and both had similar total fluoride contents (0.87 ± 0.07 and 0.94 ± 0.03 mmol/g, respectively), i.e.. half of the maximum fluoride content of fluorapatite. However, they differed considerably in their crystallographic properties. The 300 reflection peaks of both apatites were split, and their patterns were slightly different. In the former, SEM observation revealed capsule-like crystals with a rounded hexagonal shape. However, the latter had many small crystals, similar to those of homogeneous CO₃ apatite, adhering to the larger hexagonal crystals, which were also similar to homogeneous fluorCO₃apatite. Wavelength-dispersive spectroscopy attached to the SEM showed a higher fluoride intensity in the former spectrum than the latter. These results suggest that two different types of heterogeneous fluoridated CO₃ apatites were formed, CO ₃ apatite covered with fluorCO₃apatite, and fluorCO ₃apatite covered with CO₃ apatite. The simple two-step supply system used in this study is helpful for the study of complicated heterogeneous formation of apatites.

REFERENCES

• Brudevold F., Söremark R. (1967). Chemistry of the mineral phase of enamel. In: Miles AEW, editor. Structural and chemical organization of teeth. Vol. II. New York: Academic Press, 247-277.
• Brudevold F., Gardner DE, Smith FA (1956). The distribution of F in human enamel. J Dent Res 35:420-429.[Free Full Text]
• Conway EJ (1950). Microdiffusion analysis and volumetric error. 3rd ed. New York: Van Nostrand.
• Driessens Fcm (1973a). Relation between apatite solubility and anti-cariogenic effect of fluoride. Nature 243:420-421. Driessens Fcm (1973b). Fluoride incorporation and apatite solubility. Caries Res 7:297-314.[Medline] [Order article via Infotrieve]
• Eastoe JE (1965). Method for the determination of phosphate, calcium and protein in small portions of mineralized tissue. Liege: Universite de Liege.
• Grøn P., Spinelli M., Trautz 0, Brudevold F. (1963). The effect of carbonate on the solubility of hydroxyapatite. Arch Oral Biol 8:251-263.[CrossRef][Medline] [Order article via Infotrieve]
• Isaac S., Brudevold F., Smith FA, Gardner DE (1958). The relation of fluoride in the drinking water to the distribution of fluoride in enamel. J Dent Res 37:318-325.[Free Full Text]
• Jeol (1991). Product information SM27. No. 1202A162(Ks) (in Japanese). Tokyo: JEOL.
• LeGeros RZ (1991). Calcium phosphates in oral biology and medicine. Basel: Karger.
• LeGeros RZ, Suga S. ( 1980). Crystallographic nature of fluoride in enameloids of fish. Calcif Tissue Int 32:169-174.[CrossRef][Medline] [Order article via Infotrieve]
• LeGeros RZ, Trautz OR, LeGeros JP, Klein E. (1967). Apatite crystallites. Effects of carbonate on morphology. Science 155:1409-1411.[Abstract/Free Full Text]
• Meyer JL, Eanes ED (1978). A thermodynamic analysis of the amorphous to crystalline calcium phosphate transformation. Calcif Tiss Res 25:59-68.[CrossRef]
• Moreno EC, Kresak M., Zahradnik RT (1974). Fluoridated hydroxyapatite solubility and caries formation. Nature 247:64-65.[CrossRef][Medline] [Order article via Infotrieve]
• Moreno EC, Kresak M., Zahradnik RT (1977). Physicochemical aspects of fluoride-apatite systems relevant to the study of dental caries. Caries Res 11(Suppl 1):142-171.[Medline] [Order article via Infotrieve]
• Okazaki M. (1983). F-CO32- interaction in IR spectra of fluoridated CO3-apatites. Calcif Tissue Int 35:78-81.[CrossRef][Medline] [Order article via Infotrieve]
• Okazaki M. (1987). Mg2+-F interaction during hydroxyapatite formation. Magnesium 6:296-301.[Medline] [Order article via Infotrieve]
• Okazaki M. (1992). Heterogeneous synthesis of fluoridated hydroxyapatites. Biomater 13:749-754.[CrossRef]
• Okazaki M., Aoba T., Doi Y., Takahashi J., Moriwaki Y. (1981a). Solubility and crystallinity in relation to fluoride content of fluoridated hydroxyapatites. J Dent Res 60:845-849.[Free Full Text]
• Okazaki M., Moriwaki Y., Aoba T., Doi Y., Takahashi J. (1981b). Solubility behavior of CO3 apatites in relation to crystallinity. Caries Res 15:477-483.[Medline] [Order article via Infotrieve]
• Okazaki M., Takahashi J., Aoba T., Kimura H. (1982). Crystallinity, solubility, and dissolution rate behavior of fluoridated CO3 apatites. J Biomed Mater Res 16:851-860.[CrossRef][Medline] [Order article via Infotrieve]
• Okazaki M., Takahashi J., Kimura H. (1986). Crystallinity and solubility behavior of iron-containing fluoridated hydroxyapatites. J Biomed Mater Res 20:879-886.[CrossRef][Medline] [Order article via Infotrieve]
• Sobel AE, Shaw JH, Hanok A., Nobel S. (1960). Calcification. XXVI. Caries susceptibility in relation to composition of teeth and diet. J Dent Res 39:462-472.[Free Full Text]
• Trautz OR (1967). Crystalline organization of dental mineral. In: Miles AEW, editor. Structural and chemical organization of teeth. Vol. II. New York: Academic Press, 165-200.

Journal of Dental Research, Vol. 72, No. 9, 1285-1290 (1993)
DOI: 10.1177/00220345930720090501


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