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Secondary Dentin
Note that the dentin in the left half of the field has a different pattern from that facing the pulp (A). One reason for the contrast in appear-ance is that there has been a fairly abrupt change in direction of the dentinal tubules. The dentin to the left is called primary dentin (B). That facing the pulp is secondary, or reactive, dentin (C). The dentinal tubules in the secondary dentin are regularly disposed in this particular instance. It is referred to as regular secondary dentin, its formation stimulated by actute or chronic trauma. It is best observed in permanent molars and premolars, not forming at an even rate on all surfaces.
Legend
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A - pulp |
C - secondary dentin |
Lecture Notes
