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Figure 2. Polarized light microscopy (400x) of transverse sections of hydrated artificial enamel caries samples (A) and samples exposed to 20 days of fluoride remineralization solution (B). The artificial caries samples in (A) had an intact surface zone with a dark depolarizing lesion body. After remineralization, a zone of repaired enamel was evident over the remaining depolarizing lesion body. High-resolution digital transverse microradiography (TMR) revealed extensive mineral loss, with a higher mineral volume surface zone, after the nine-day exposure to the demineralization solution (C). After exposure to the remineralization solution, the mineral volume increased in the lesion body and was completely restored near the surface zone of the artificial lesion (D). The blue scale bars are 50 µm.
