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Normal dentin

Scanning electron microscopy (SEM) image of normal dentin showing its unique structure as seen from two directions. At the top is a view of the tubules, each of which is surrounded by peritubular dentin. Tubules lie between the dentin-enamel junction (DEJ) and converge on the pulp chamber. The perpendicular surface at the bottom shows a fracture surface revealing some of the tubules as they form tunnel-like pathways toward the pulp. The tubule lumen normally contains fluid and processes of the odontoblastic cells. (From