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Figure 1. Morphological patterns of normal and fluorotic dentin. (A) Scanning electron micrograph of dentin in severe fluorosis, showing narrowed tubular lumina and compacted peritubular and intertubular tissue. (B) Scanning electron micrograph of control dentin showing regular tubular dentin. All tissues were plunge-frozen in liquid-nitrogen-cooled Freon 22, freeze-dried at – 80°C, and sputter-coated with carbon for EPMA analysis, and then gold-coated for examination in SEI mode. Scale bars = 40 µm.
