Abstract
A method was devised for studying the passage of radioactive ions into fragments of human dental enamel taken from various depths from the enamel surface to the dentine-enamel junction. The rate at which 18F and 24Na pass into an enamel fragment varied according to the depth of the fragment from the enamel surface and, by inference, can be related to the quantity of loosely bound water present. Dehydrating enamel fragments by heating at 110 ° and 200 °C, followed by immersion in water for more than 24 hr, significantly reduced the uptake of 18F while no significant change was apparent after heating at 70 °C. The mechanism of uptake in each case was still diffusion-controlled.
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