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, fluoroapatite (floo(-o)-rap'a-tit?) (floo?(o-)ro-ap'a-tit?)
A compound formed when tooth enamel is treated with appropriate concentrations of the fluoride ion. The modified hydroxyapatite is less acid soluble and therefore resistant to caries. Fluorapatite is formed in bone and in enamel and dentin of teeth when fluoride is taken systemically.
Synonym: fluorhydroxyapatite
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References in periodicals archive ?
In fluoroapatite (P[6.sub.3]/m space group), the F ions are located along the c-axis on the mirror planes passing through the [Ca.sub.II] triangles, whereas in hexagonal HA, the O[H.sup.-] ions, with internuclear axes coincident with the c-axis, are displaced about 0.03 nm from the planes of the [Ca.sub.II] triangles with protons pointing away from the [Ca.sub.II] triangles [33]; thus, the mirror planes passing through the [Ca.sub.II] triangles are lost and the P[6.sub.3] space group results.
Hydroxy-apatite is the mineral portion of human and animal bone but is also grown naturally (along with fluoroapatite) in thermal springs and can be grown synthetically for use in environmental remediation.
Fluoride not only inhibits the demineralization of enamel, but it can also reverse it or remineralize it by producing a new crystalline surface of fluoroapatite nature which has a much lower solubility in the acids [21, 25].
While shark teeth contain the mineral fluoroapatite (fluorinated calcium phosphate), the teeth of humans and other mammals contain hydroxyapatite, which is an inorganic constituent also found in bone, explained co-author Matthias Epple.
Fluorine (F) plays a critical role in the formation of fluoroapatite. Fluoroapatite is a mineral that is part of the enamel on our teeth.