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(a) SEM micrograph of fractured superficial dentin. Int – intertubular dentin; P – peritubular dentin; T – dentin tubule; Arrows – bacteria in the tubule lumen. Original magnification = 10,000X. (b) SEM micrograph of fractured deep dentin 75 μm from the pulp of the same tooth in Fig. 2a. Original magnification = 10,000X.
