Abstract
The mineralization pattern of normal permanent enamel of ten human incisors was studied with quantitative contact microradiography. A detailed description of the technique is given. The general trend in the mineralization pattern consisted in a smooth decrease in the amount of mineral salts from the surface of the enamel toward the dentinenamel junction. This decrease varied considerably in individual samples, the extreme values being 0.7 and 4.4 % mineral salts by weight. A simultaneous investigation with polarized light microscopy revealed no correlation between the birefringence and the mineral content. Permanent enamel was found to be nonimbibable with immersion liquids other than water. The influence of the hydration state of enamel on the polarized light picture is also discussed in detail.
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