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A natural mineral structure that the crystal lattice of bones and teeth (that is, amorphous hydroxyapatite) closely resembles; used in chromatography of nucleic acids; also found in pathologic calcifications (for example, atherosclerotic aortas).
Synonym(s): hydroxylapatite
Farlex Partner Medical Dictionary © Farlex 2012


, hydroxylapatite (hī-drok″sē-ap′ă-tīt″) (″sĭ-lap′ă-tīt″) [ hydro- + ²oxy- + apatite ]
Ca10(PO4)6(OH)2; the calcium- and phosphorus-containing compound that constitutes the bulk of the mineral structure of bones and teeth. In teeth it is soluble in the acids of soft drinks or carbohydrate fermentation, but it becomes decay-resistant fluoroapatite after combining with fluoride ions present in fluoridated water or fluoride toothpastes. Under some circumstances, it can deposit in and around joints, producing periarthritis or calcific tendinitis.
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References in periodicals archive ?
Calcium hydroxylapatite (HA) can also be applied to immobilize dangerous metallic compounds in metal-contaminated soils and industrial wastewaters due to its huge ion substitution capacity, which can considerably decrease the mobility and bioavailability of [Zn.sup.2+], [Pb.sup.2+], [Cd.sup.2+], [Cu.sup.2+], [Ni.sup.2+], and [U.sup.2+] by transforming these toxic metal ions into some new forms having low solubility and high geochemical stability [1, 5,14-18].
In this work, calcium hydroxylapatite [[Ca.sub.5][(P[O.sub.4]).sub.3]OH, Ca-HA] and Zn-substituted hydroxylapatites [[([Z.sub.nx][Ca.sub.1-x]).sub.5][(P[O.sub.4]).sub.3]OH, Zn-Ca-HA] with various Zn/(Zn + Ca) atomic ratios were prepared and the influences of zinc replacement on the hydroxylapatite properties were investigated with XRD, FT-IR, FE-SEM, and FE-TEM instruments.
Radiesse contains a synthetic (or man-made) version of calcium hydroxylapatite, a substance found in bones and teeth.
Growth in this sector boomed with the introduction of BOTOX wrinkle treatments in the 1990s and will continue to be driven by new product introductions, most notably tissue fillers based on materials such as hyaluronic acid and calcium hydroxylapatite, among others.
Injections of autologous fat, autologous chondrocytes harvested from the ear, or calcium hydroxylapatite also have shown promise but are still considered investigational.
Autologous fat can be used, but more demand is being seen for calcium hydroxylapatite microsphere (Radiesse) fillers, said Dr.
He was aphonic after decannulation and was diagnosed with "vocal fold paralysis." He was treated twice by another physician with calcium hydroxylapatite injection into the immobile vocal fold, but his aphonia persisted.
CHICAGO -- Calcium hydroxylapatite provided excellent clinical results and was well tolerated over 12 months in the largest prospective study to date of vocal cord insufficiency, Dr.
Temple hollows can also be filled with calcium hydroxylapatite, poly-L-lactic acid and less often with hyaluronic acid to revolumize and create a lift of the lateral brow.
(5) The compound is made up of calcium hydroxylapatite particles suspended in a carboxymethylcellulose gel.
Radiesse is a synthetic, injectable implant composed of calcium hydroxylapatite microspheres (diameter range, 25 to 45 [micro]m) suspended in an aqueous gel carrier.
Radiesse is made of smooth calcium hydroxylapatite (CaHA) microspheres, which have a diameter range of 25[micro]m to 45[micro]m, suspended in an aqueous gel carrier.