Fluorosed Human Enamel

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Abstract
This scanning electron microscopic study summarizes observations made on 6 fluorosed, erupted human permanent teeth. As controls, normal permanent teeth were employed. The exterior surface of the fluorosed teeth and the outer and inner parts of enamel surfaces obtained by breaking were studied without or following short treatment with citric acid. The exterior surface and the outer part of broken or cut surfaces regularly showed evidence of in vivo decalcification. Central defects in the c-axis direction of enamel crystallites were seen in non-acid-treated exterior surfaces. The outer part of broken, non-treated and polished surfaces displayed a highly variable pattern of dissolution, in which areas immediately surrounding prism sheath markings appeared particularly resistant. The basic texture in such areas was described as of a sintered nature, in which no structures akin to normal crystallites could be identified. The inner part of similarly prepared surfaces displayed a rather regular, but still more porous than normal, appearance. Central defects in the crystallites in the inner parts of fluorosed enamel were only seen after in vitro acid treatment. In broken, non-treated surfaces the inner parts showed remarkably well shaped crystallites with a width about 3 .times. larger than sound enamel.

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