Abstract
The electron probe has been used to study the distribution of calcium and phosphorus in incipient carious lesions in human teeth. The findings indicate that the outer surface layer of natural white spot lesions of enamel may contain either greater or lesser amounts of mineral than the outer surface of adjacent non-carious enamel. The average Ca P ratio over the entire lesion was found to be essentially normal. There appears to be a redistribution of calcium and phosphorus in the subsurface zone of decalcification with extreme losses adjacent to hypermineralized areas. The Ca P ratio was always lower than normal in the hypermineralized areas because of excess phosphorus, whereas in the hypomineralized areas the Ca P ratio was high because of low phosphorus.
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