Abstract
Dental decay may be closely related to disturbances in calcium-phosphorous metabolism. There has been little evidence to indicate the mechanism by which such systemic factors operate on the fully erupted tooth. One possibility in this connection is that the tooth can undergo post-eruptive changes in calcification in response to such systemic changes. To determine whether such intradental changes do occur, Bodecker and Applebaum1 made roentgenological study of teeth in ground section, 1 mm. thick. The radiation was obtained from an X-ray machine which operates at about 40,000 volts. By this method, only gross differences in radiolucency were recognizable—such as that between dentin and enamel, or the partial decalcification associated with a lesion of incipient caries. In no case was it possible to distinguish any minute structural detail. Similar results have been obtained by Heiwinkel.2Recently, Fricke3 found that excellent radiographs of insects can be obtained by means of soft X-rays (Grenz or Boundary...
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