enamel hypoplasia

hypoplasia /hy·po·pla·sia/ (-pla´zhah) incomplete development or underdevelopment of an organ or tissue.hypoplas´tic

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enamel hypoplasia  incomplete or defective development of the enamel of the teeth; it may be hereditary or acquired.

oligomeganephronic renal hypoplasia  oligomeganephronia.

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enamel hypoplasia,

a defect in which the enamel of the teeth is hard but thin and deficient in amount as a result of defective enamel matrix formation with a shortage of the cementing substance. It is characterized by lack of contact between teeth, rapid breakdown of occlusal surfaces, and a yellowish-brown stain that appears where the dentin is exposed. The condition affects both primary and secondary dentition. It is transmitted genetically or caused by environmental factors such as vitamin A, C, or D deficiency; fluorosis; rash-producing childhood diseases; congenital syphilis; injury or trauma to the mouth; or administration of tetracyclines during the second half of pregnancy or during early tooth development. Compare enamel hypocalcification. See also amelogenesis imperfecta.

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enamel

the white, compact and very hard substance covering and protecting the dentine of the crown of a tooth.

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enamel bulge

the area of greatest diameter of a tooth, just external to the gum line, which acts to deflect food from the free gingival margin and the gingival crevice.

enamel epithelium

epithelium which creates a bell-shaped enamel organ, surrounding the dental papilla; the internal epithelium consists of columnar ameloblasts which secrete enamel.

enamel hypoplasia

incomplete or partial development; a common defect in dogs.

inherited enamel defect

an inherited absence of enamel from all teeth combined with excessive flexibility of joints in Holstein-Friesian cattle. The teeth are pink and obviously deficient in substance. A defect in collagen formation is probable.

enamel layer

the outermost layer of cells of the enamel organ.

mottled enamel

dental fluorosis; defective enamel, with a chalky white appearance or brownish stain, caused by excessive amounts of fluorine in drinking water and food preparations during the period of enamel calcification.

enamel organ

an epithelial cap over a dental papilla that develops into the enamel-producing organ. The shape of the enamel organ determines the shape of the tooth.

enamel points

sharp projections of enamel at the junction of the buccal and occlusal surfaces of a tooth. Seen most commonly in horses.

enamel rods

progressively mineralized glycoproteinaceous tubules, the basic structural units of enamel; enamel is acellular and consists of interrod material and rods,

enamel spot

remnant of the enamel cup in the center of an incisor tooth table in a horse.

Enamel spot. By permission from Sack W, Wensing CJG, Dyce KM, Textbook of Veterinary Anatomy, Saunders, 2002

enamel works

factories manufacturing enamels or using them extensively; sources of fluorine for pollution of pasture and water.