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Incremental Lines in Dentin
Dentinal tubules cross the field from left to right. Fine lines (A) run almost perpendicular to the dentinal tubules from top to bottom on the screen. Note that these lines occur at regular increments. These are the incremental lines of von Ebner. This is a ground section, but these lines can also be seen in demineralized sections. The lines of von Ebner represent cyclic activity of the odontoblasts during dentin formation. These incremental lines illustrate the daily pattern of dentin deposition that progresses at about 6 µm per day in the crown and about 3.5 µm per day in the root.