Trace Element Content of the Hard Dental Tissues and Dental Plaque

Influence of Iron Alone or with Fluoride on Caries Development in Desalivated and Intact Rats

“…Significant levels of iron are found in dental plaque. Nixon [1969] reports levels in human plaque in the range o f 100-1,000 ppm; we did not determine the level of iron in plaque from our animals.…”

A Method for Simultaneous Measurement of Calcium and Phosphorus in Tooth Surface Samples, Dissolved in vivo, Using Activation Analysis

“…When samples from teeth, particularly the superficial layer, are irradiated, the presence of radioactivity from other ele ments such as magnesium, fluorine, iron and lead is almost certain, since significant amounts of several trace elements in enamel has already been demonstrated [Nixon, 1969], Also, while every effort was made to remove contamination, elements such as so dium cannot be excluded completely from biological samples; again, both the buffer and the chromatography paper contain small quantities of elements which may in terfere with the analysis. However, since these elements are present in such small quantities, only those whose thermal neu tron cross-sections are exceptionally high (such as sodium) or whose radioactive de cay produces fi-rays in the same energy range as those from either 45Ca or 32P will cause interference.…”