Figure 3. Electron micrographs of the enamel. The images were obtained via scanning electron microscopy at 7.500x (A, B, C, D, E, F) and 100x (G, H, I) magnifications. A, B. C - Images of the surface enamel without pH-cycling; A - Non-irradiated enamel; B - Enamel irradiated in humidity; C - Enamel irradiated in fluoride. D, E, F, G, H, I - Images of the surface enamel after pH-cycling; D and G - Non-irradiated enamel; E and H - Enamel irradiated in humidity; F and I - Enamel irradiated in fluoride. The arrows indicate the loss of discontinuity of the outer morphology.
