Figure 2.

(A–G) Scanning electron micrographs of coronal dentine of carious teeth without treatment (original magnification X6000). (A) Cavity floor dentine with a great number of intratubular bacteria consisting of cocci (red arrow), rods (blue arrow) and filamentous bacteria (green arrow); (B, C and D) upper, middle and lower portions of occlusal half of coronal dentine with a large number of bacterial aggregates in dentinal tubules; (E, F) upper and middle portions of pulpal half of coronal dentine with a small amount of bacteria in the dentinal tubules; (G) lower portions of pulpal half of coronal dentine with numerous visible cuboid crystals but no bacterial colonization in the dentinal tubules.