Trace Elements and Dental Caries. Variation of Strontium Content of Surface Enamel with Geography, Age and Caries.

From areas of Ohio with high and low strontium concentrations in drinking water, 184 teeth were collected for analysis. All teeth were derived from life-long residents of their communities, and collected through the co-operation of local dentists. Acid etch biopsies were carried out on the enamel of the teeth used. Samples were then analysed for calcium and strontium by flame atomic absorption, and fluorine by specific ion electrode. Results showed there to be an increase in surface enamel strontium with age, and concentrations were also related to strontium drinking water levels. Concentrations of fluorine in surface enamel were also higher in teeth from the high strontium area, although drinking water fluorine levels were similar. Mean levels of strontium were sigificantly higher in low caries individuals (DMFT < 4), when compared with high caries individuals.