amelogenesis imperfecta

[ĭm′pər-fĕktə]
n.
  1. A hereditary condition in which the dental enamel does not develop properly, often because of insufficient calcification.enamel dysplasia
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.