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Tome's Granular Layer of Dentin

In the root, a layer of dark granules lie parallel to the outer surface of the dentin. This is called Tomes' granular layer (A). Cementum (B) lies along the lower margin of the field. Tomes' granular layer lies immediately adjacent to the cementum of the root in the region of the mantle dentin. Note the distinctly different colored lines (C) that traverse the dentin (D). These lines are not incremental lines of von Ebner, but rather contour lines of Owen. They reflect a major interruption in the deposition of dentin due to a metabolic distruption during odontogenesis.



A - Tomes' granular layer
B - cementum

C - contour lines of Owen
D - dentin

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