apatite crystal


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apatite crystal

In dentistry, the hydroxyapatite crystal typical of calcified tissues; a complex of calcium phosphate and other elements, present in bone and in the cementum, dentin, and enamel layers of teeth. The most dense crystalline pattern is found in enamel, the hardest tissue of the body.
See also: crystal
References in periodicals archive ?
Studies with synthetic HAp showed that Zn2+ is readily acquired by the apatite as it competes with Ca2+ and can attain position on the apatite crystal, making the HAp resistant to the acid dissolution.
Use a slightly different temperature for how cool the surface of the Earth is, for instance, and suddenly an apatite crystal might look like it's been buried for much longer.
Indeed, abundant apatite crystals were identified in the lumens of loops of Henle.
The most dramatic piece (which has been named the "Apatite Sapo King") is a cluster of albite and muscovite crystals measuring 15 X 23 X 48 cm, richly coated with sharp apatite crystals up to 6 cm and, on top on the left side, one large bicolor apatite crystal (very pale tan with a dark green core) measuring 5 X 5 cm (habit 6; see below).
Zinc plays an important role in the modulation of crystallinity of the apatite crystals.
The formation of carbonate apatite crystals in HA and BGHA surface is a very complex process and this attributes to the establishment of strong bonding zone at the bone-material interface.
showed a calcium phosphate rich interface layer with apatite crystals grown on solid state reaction between glass ceramic and bone.
Hydroxy apatite crystals are in shape of needles and plates 27A[degrees]--75A[degrees] thick, 44A [degrees]--75A[degrees] wide and 50A[degrees]--400A[degrees] long.
Dental enamel is arranged in the form of hexagonal apatite crystals.
Their simulations revealed that the unusually hydrogen-rich apatite crystals observed in many lunar rock samples may not have formed within a water-rich environment, as originally thought.
Conduction of fission-track dating studies on the apatite crystals using the external detector method and absolute approach yielded an average fission-track age of 29.