Am J Dis Child. 1942;63(1):154-163. doi:10.1001/archpedi.1942.02010010155014.
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The abnormality of the teeth known as hypoplasia of the enamel is to dental practitioners and pediatricians a well recognized clinical entity and has been the subject of considerable dental research. Although the condition was previously described in the literature under such names as atrophy, erosion and honeycombed teeth, the term hypoplasia was first employed by Zsigmondy1 (1893). Black2 (1908) described various types of defects of the enamel under the heading "dystrophies of the teeth." Berg3 (1919) reported the occurrence of hypoplasia of the enamel in 56.6 per cent of a group of children with cataracts. He graded the defect into four types according to its severity and stated that it is generally believed to be caused by rachitis, congenital syphilis or childhod diseases which disturb the general metabolism. The Medical Research Council of London4 (1925) reported on the incidence of hypoplasia of the enamel in


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