Summary
In order to study the effect of F- on tooth enamel-like apatite formation, crystal growth experiments were carried out in the presence of 0.1}2 ppm F- at 37°C and at pH 6.5 in a model system of enamel formation where octacalcium phosphate (OCP) was stable. Morphology changed from long and thin ribbons to small needle-like plates, and the product changed from OCP to apatite with an increase in F- concentration. In the presence of 0.1–1 ppm F-, apatite-OCP intergrowth took place, and crystals composed of apatite and OCP lamellas were formed. These crystals showed long and thin plate-like morphology and embedded an OCP lamella in the center of the crystal. The OCP lamella and its (100) planes were parallel to the (100) planes of apatite. The thickness of OCP decreased and that of apatite increased with an increase in F- concentration. Some apatite crystals obtained at 1 ppm F- embedded a central plane instead of the distinct OCP lamella. The result indicates that initially formed, thin, plate-like OCP acted as a template for the subsequent epitaxial overgrowth of apatite and, moreover, F- played an important role in regulating the apatite-OCP intergrowth.
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References
Fearnhead RW (1960) Mineralization of rat enamel. Nature 189:509–510
Rönnholm E (1962) The amelogenesis of human teeth as revealed by electron microscopy. J Ultrastruct Res 6:249–303
Nylen MU, Eanes ED, Omnell KA (1963) Crystal growth in rat enamel. J Cell Biol 18:109–123
Travis DF, Glimcher MJ (1964) The structure and organization of and the relationship between the organic matrix and the inorganic crystals of embryonic enamel. J Cell Biol 23:447–497
Brown WE (1962) Octacalcium phosphate and hydroxyapatite. Nature 196:1048–1050
Brown WE (1965) A mechanism for growth of apatitic crystals. In: Stack MV, Fearnhead RW (eds) Tooth enamel II. John Wright & Sons, Bristol, pp 11–14
Brown WE (1966) Crystal growth of bone mineral. Clin Orthop 44:205–220
Nelson DGA, Barry JC, Shields CP, Glena R, Featherstone JDB (1989) Crystal morphology, composition, and dissolution behavior of carbonated apatites prepared at controlled pH and temperature. J Coll Inter Sci 130:467–479
McClure FJ, Likins RC (1951) Fluorine in human teeth studied in relation to fluorine in the drinking water. J Dent Res 30:172–176
Aoba T, Moreno EC (1987) The enamel fluid in the early secretory stage of porcine amelogenesis: chemical composition and saturation with respect to enamel mineral. Calcif Tissue Int 41:86–94
Suess PH, Fosdick LS (1951) The solubility of normal and fluoridized enamel. J Dent Res 30:177–181
Jenkins GN (1963) Theories on the model of action of fluoride in reducing dental decay. J Dent Res 42:444–452
Frazier PD, Little MF, Casciani FS (1967) X-ray diffraction analysis of human enamel containing different amounts of fluoride. Arch Oral Biol 12:35–42
Taves DR, Neuman WF (1964) Factors controlling calcification in vitro. Arch Biochem Biophys 108:390–397
Eanes ED (1980) The influence of F ion on the seeded growth of apatite from stable supersaturated solution at pH 7.4. J Dent Res 59:144–150
Brown WE, Smith JR, JR Lehr, Frazier AW (1962) Octacalcium phosphate and hydroxyapatite. Nature 196:1048–1055
Newesely H (1970) Factors controlling apatite crystallization, with particular reference to the effect of F and accompanying ions. Adv Oral Biol 4:11–42
Aoba T, Ishida T, Yagi T, Hasegawa K, Moriwaki Y (1975) X-ray crystallographic studies on the conversion of octacalcium phosphate into hydroxyapatite. Jpn J Oral Biol 17:1–7
Brown WE, Tung MS, Chow LC (1981) Roles of octacalcium phosphate in the incorporation of impurities into apatites. In: Proc 2nd Int Congr on Phosphorus Compounds. Boston, April 21–25, pp 59–71
Iijima M, Moriwaki Y (1989) Effect of inorganic ions on morphology of octacalcium phosphate grown on cation selective membrane at physiological temperature and pH in relation to enamel formation. J Cryst Growth 96:59–64
Iijima M, Moriwaki Y (1991) Lengthwise and oriented growth of octacalcium phosphate on cation selective membrane in a model system of enamel formation. J Cryst Growth 112:571–579
Marshall AF, Lawless KR (1981) TEM study of the central dark line in enamel crystallites. J Dent Res 60:1773–1782
Nelson DGA, Barry JC (1989) High resolution electron microscopy of nonstoichiometric apatite crystals. Anat Rec 224:265–276
Miake Y, Aoba T, Moreno EC, Shimoda S, Prostak K, Suga S (1991) Ultrastructural studies on crystal growth of enameloid minerals in elasmobranch and teleost fish. Calcif Tissue Int 48:204–217
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Iijima, M., Tohda, H., Suzuki, H. et al. Effects of F- on apatite-octacalcium phosphate intergrowth and crystal morphology in a model system of tooth enamel formation. Calcif Tissue Int 50, 357–361 (1992). https://doi.org/10.1007/BF00301634
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DOI: https://doi.org/10.1007/BF00301634