Features and Structure of dentine
Structure of dentine
Dentine consists of many dentinal tubules that run parallel to each other, following a double curved course, and extend from the pulp to the amelo-dentinal junction. Each dentinal tubule contains an odontoblast process surrounded by intercellular ground substance composed of fine collagenous fibrils. The odontoblast cells are a layer of closely arranged cells on the pulpal surface of the dentine with their nuclei situated at the basal (pulpal) end of each cell.
Features of dentine
The following features of dentine are significant:
■ Incremental lines: these are produced due to the rhythmic pattern of dentinogenesis often referred as contour lines of Owen. These lines are seen when dentinogenesis is disrupted (as with amelogenesis).
■ Neonatal line: this is only seen in primary teeth and first permanent molars as a line that marks dentine formation before and after birth.