Figure 3.

Images of one of the tooth samples with a D2 lesion. (a) Visible-light reflectance image, (b) radiograph, (c) and (d) PLM images of the sections cut along the yellow dotted lines in (a) NIR transillumination images captured with the (e) Ge-enhanced CMOS camera [setup of Fig. 1a] and (f) NIR InGaAs FPA [setup of Fig. 1b]. The lesion areas appear as darker areas in the NIR images. These are best resolved in (e). The lesion areas are the dark areas in the enamel in the PLM images (c) and (d). The lesion areas are harder to resolve in the dentin using PLM, and they actually appear lighter than the sound dentin. Therefore, TMR was used to confirm the lesion depth in dentin. (Color online only.)