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Hydroxyapatite (IMA name: hydroxylapatite [5]) (Hap, HAp, or HA) is a naturally occurring mineral form of calcium apatite with the formula Ca 5 (PO 4) 3 (OH), often written Ca 10 (PO 4) 6 (OH) 2 to denote that the crystal unit cell comprises two entities. [6]
Apatite is a group of phosphate minerals, usually hydroxyapatite, fluorapatite and chlorapatite, with high concentrations of OH −, F − and Cl − ion, respectively, in the crystal. The formula of the admixture of the three most common endmembers is written as Ca 10 ( PO 4 ) 6 (OH,F,Cl) 2 , and the crystal unit cell formulae of the ...
Whitlockite is a mineral, an unusual form of calcium phosphate.Its formula is Ca 9 (MgFe)(PO 4) 6 PO 3 OH. [2] [3] [4] It is a relatively rare mineral but is found in granitic pegmatites, phosphate rock deposits, guano caves and in chondrite meteorites. [4]
Hydroxyapatite, the major mineral component of bone, has been made synthetically from several biological and chemical components and can be formed into ceramic materials. Orthopedic implants coated with these materials bond readily to bone and other tissues in the body without rejection or inflammatory reaction.
Ossein-hydroxyapatite is a composite of collagen protein (ossein) and hydroxyapatite. Ossein-hydroxyapatite exhibits high stability and is less soluble in water compared to other calcium compounds. Microcrystalline hydroxyapatite is extracted from bovine bone and contains the mineral matrix found in human bones.
Calcium hydroxyphosphate (calcium phosphate tribasic, tribasic calcium phosphate, hydroxyapatite, HAp) is an inorganic chemical compound that is made up of calcium, hydrogen, oxygen and phosphorus. Its formula is Ca 5 (OH)(PO 4) 3. [1] It is found in the body and as the mineral hydroxyapatite. [citation needed]
hydroxyapatite, Ca 5 (PO 4) 3 OH; octacalcium phosphate, Ca 8 H 2 (PO 4) 6 · 5 H 2 O; and brushite, CaHPO 4 · 2 H 2 O; The organic component is approximately 85% cellular and 15% extracellular matrix. [5] Cell density within dental plaque and calculus is very high, consisting of an estimated 200,000,000 cells per milligram.
Fluorapatite, often with the alternate spelling of fluoroapatite, is a phosphate mineral with the formula Ca 5 (PO 4) 3 F (calcium fluorophosphate). Fluorapatite is a hard crystalline solid.