Figure 2. (a) SEM and (b) AFM images of fully mineralized dentin specimens showing the tubule lumens with surrounding cuffs of peritubular dentin. The bar in the SEM photomicrograph is 10 µm. Labeling: L = tubule lumen, PT = peritubular dentin, IT = intertubular dentin matrix. SEM image after Kinney et al. (2001a). AFM image after Kinney et al. (1993).