(redirected from Calcium hydroxyapatite)
Also found in: Encyclopedia.


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.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Comparing the indices of radiological measurement of the depth of the osseous pockets, radio densitometry of the bone structures before and after treatment of peri-implantitis with the use of pure calcium hydroxyapatite, it may be concluded that long-term results after 5 years are stable.
Although many experimental works on the dissolution mechanism and kinetics of apatites in aqueous solution had already been executed [7, 12-16], much of them only concentrated on calcium hydroxyapatite and fluorapatite.
Aarushi Passi, Cosmetic Physician at REVA Aesthetics Clinic, "Natural HA ( hyaluronic acid) fillers are perfectly bio-compatible with our skin tissue, but one must reconsider before getting silicone or permanent fillers like calcium hydroxyapatite, as they might not integrate well and cause complications."If a filler goes wrong it can be diluted, while with Botox the patient has to wait it out for 4-6 months until the effects wear off.
The hallmark of the disease is calcium hydroxyapatite deposition into the tendinous insertions of the longus colli musculature, a paired neck flexor, (1-3) which is not fully understood but thought to occur as a response to prior inflammation or infection, such as an upper respiratory infection, or trauma.
A calcium hydroxyapatite precipitated from an aqueous solution an international multi method analysis.
(5) Imaging and biopsy may confirm the diagnosis revealing yellow material containing calcium hydroxyapatite.
A synthetic dermal filler made of calcium hydroxyapatite and is used for the correction of moderate to severe wrinkles and folds.
Calcium hydroxyapatite has been reported to last for 6 to 12 months.
An optimal multivitamin/multimineral will have vitamin E, carotenoids, zinc, magnesium, copper, a full complement of B vitamins and microcrystalline calcium hydroxyapatite (MCHC) for the calcium component.
Formation and structure of zinc-substituted calcium hydroxyapatite, Materials Research Bulletin, 40(2): 209-220.
Calcium hydroxyapatite can be used in bone repair and in the treatment of bone diseases in orthopedic surgeries.
Calcium hydroxyapatite microcrystal is a natural extract of bone calcium.