(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


/hy·drox·yl·ap·a·tite/ (hi-drok″sil-ap´ah-tīt) hydroxyapatite.


, 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.
References in periodicals archive ?
Involvement of the neck flexor pair, longus colli, with crystalline deposition of calcium hydroxyapatite triggers an inflammatory response which can produce a fluid collection in the retropharyngeal/ prevertebral spaces and causes edematous change to the muscles.
Treatment of juxta-articular intraosseous cystic lesions in rheumatoid arthritis patients with interconnected porous calcium hydroxyapatite ceramic.
Although CPPD is the most common cause of radiographic signs in chondrocalcinosis, both CPPD and calcium hydroxyapatite can be present.
Tonsilloliths are composed of calcium hydroxyapatite and calcium carbonate with other minerals including phosphorus, ammonia and magnesium (1).
Tung, Preparation and comprehensive characterization of a calcium hydroxyapatite reference material, J.
The synthetic biodegradable polymer/ interconnected-porous calcium hydroxyapatite ceramics (IP-CHA) composite is an excellent combination carrier/scaffold delivery system for recombinant bone morphogenetic protein-2 (rhBMP-2), that strongly promotes the clinical effects of rhBMP-2 in bone tissue regeneration (67).
Interaction of cadmium ions with calcium hydroxyapatite crystals: a possible mechanism contributing to the pathogenesis of cadmium-induced bone diseases.
The inorganic components of the bone matrix, 60% of dry weight bone, is composed of calcium phosphate and calcium hydroxyapatite, which are responsible for the compression strength of bone.
The effects of serum and human albumin on calcium hydroxyapatite crystal growth.
These include: Vitamin E (400 to 800 IU daily) to help reduce hot flushes and night sweats; Calcium (1,500mg daily) - the best type of calcium is not calcium carbonate which may not be fully absorbed, but microcrystalline calcium hydroxyapatite calcium (MCHC) or calcium citrate; Magnesium (500mg to 750mg daily) is essential to help with the absorption of calcium; Vitamin C (1,000mg to 2,000mg daily) helps absorption of Vitamin E and decreases capillary fragility.
Calcium carbonate and calcium hydroxyapatite are less well absorbed than calcium citrate.
Enamel is mainly composed of calcium hydroxyapatite (HAp), and can have variety of ionic and cationic substitutions (sodium, magnesium and zinc)in its structure.