Relation between Acid Dissolution and Histological Alteration of Heated Tooth Enamel (with 1 color plate)

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Abstract
Variations in acid dissolution and histological appearance of heated human tooth enamel due to temperature (100–600 °C) have been studied by means of chemical analyses, polarizing microscopy and scanning electron microscopy. The amount of dissolved Ca and the lesion depth obtained from the heated enamel after artificial caries-like lesion formation clearly vary dependent on the heating temperature and are closely related to the histological changes in enamel by heating. These variations are explained in terms of the permeability and the internal surface area of enamel. Laser effects on the acid dissolution of enamel are discussed.