Abstract
The occlusal surfaces of permanent and deciduous teeth were cleaned with pumice and a rotary brush and conditioned with 50 per cent orthophosphoric acid to which 7 per cent zinc oxide was added by weight. The crowns were split to allow examination of the deepest areas of the pits and fissures. Permanent teeth exhibited greater topographical alteration than deciduous teeth, whereas the demineralization patterns observed for deciduous teeth were more ordered and consistent within localized areas, but more variable from area to area, than the patterns of permanent teeth. These variations may be indicative of basic differences in structure and composition of the outer layers of occlusal enamel of permanent and deciduous teeth.
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