enamel hypoplasia

a form of amelogenesis imperfecta characterized by incomplete formation of the dental enamel. It may be transmitted as an X-linked or autosomal dominant trait, or be associated with vitamin A, C, or D deficiency, measles, chickenpox, scarlet fever, congenital syphilis (Hutchinson teeth), prematurity, birth injuries, Rh incompatibility, trauma, local infection, or Morquio disease. Small grooves, pits, and fissures on the enamel surface may be seen in mild cases, deep horizontal rows of pits in severe cases; or absence of enamel in extreme cases; associated with yellow, reddish, or brown discoloration of the teeth. Called also hypoplastic emphysema.