Hydroxyapatite crystals are small and negatively birefringent.

Fluoride helps prevent dental decay by binding to the hydroxyapatite crystals in enamel.

The odontoblast process causes the secretion of hydroxyapatite crystals and mineralization of the matrix.

The latest research indicates that these proteins regulate the initiation and growth of hydroxyapatite crystals during the mineralization of enamel.

They bond directly to tooth tissue by the interaction of polyacrylate ions and hydroxyapatite crystals, thereby avoiding acid etching.

Fluoride is incorporated into the hydroxyapatite crystal of a developing tooth and makes it more resistant to demineralization and subsequent decay.

Measuring 4 μm wide to 8 μm high, an enamel rod is a tightly packed, highly organized mass of hydroxyapatite crystals.

If the body does not destroy the improper collagen, the relationship between the collagen fibrils and hydroxyapatite crystals to form bone is altered, causing brittleness.

In another level of complexity, the hydroxyapatite crystals are platelets that have a diameter of approximately 70-100 nm and thickness of 1 nm.

EHDP (Didronel) does this by inhibiting the conversion of amorphous calcium phosphate to hydroxyapatite crystals which prevents mineralization of the bone matrix.

Gallium inhibits osteoclastic activity and therefore decreases hydroxyapatite crystal formation, with adsorption of gallium onto the surfaces of hydroxyapatite crystals.

In addition, as the acid from the bacteria demineralizes the hydroxyapatite crystals, calcium and phosphorus are released, allowing for the precipitation of more crystals which fall deeper into the dentinal tubule.

The enamel is made up of small, round prisms (bundles of hydroxyapatite crystals) that are separated by large, continuous bands of interprismatic matrix (IPM; the material between the enamel prisms).

Milwaukee Shoulder Syndrome (apatite-associated destructive arthritis) is a rheumatological condition similar to Calcium pyrophosphate dihydrate deposition disease (CPPD), and is the result of periarticular or intraarticular deposition of hydroxyapatite crystals.

For instance, PS presence on the extracellular membrane face of erythrocytes is a marker of cell apoptosis, whereas PS in growth plate vesicles is necessary for the nucleation of hydroxyapatite crystals and subsequent bone mineralization.

The basic unit of enamel is called an enamel rod., Measuring 4-8 μm in diameter, an enamel rod, formally called an enamel prism, is a tightly packed mass of hydroxyapatite crystals in an organized pattern.

The ions necessary to form calcium carbonate are also secreted by the mantle, but it is the tailored environment created by the organic matrix which causes aragonite (rather than calcite) crystals to nucleate, in much the same way that collagen nucleates hydroxyapatite crystals.