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Figure 1. PS-OCT b-scan images of bordering sound enamel in the parallel (A) and perpendicular (B) axes. Near the enamel surface (arrows), the signal in the perpendicular axis is minimal compared with the moderate back-scattered intensity in the parallel axis. Parallel-axis images of the nine-day artificial caries lesion (C) and the lesion after fluoride remineralization treatment (E) show the decrease in overall reflectivity with the existence of a surface zone of lower scattering after treatment. All of the parallel-axis images possess intense surface reflection that confounds analysis of the subsurface enamel and surface zone. Perpendicular-axis images of the artificial caries lesion (D) and the remineralized lesion (F) are shown. The perpendicular-axis image clearly resolves a surface zone, with optical properties similar to those of the sound enamel (B), and illustrates that the overall reflectivity of the lesion decreased after remineralization. Images are displayed in a false-color scale (bottom), and the blue scale bar (A) is 200 µm in real depth.
