Enamel Microcracks Induced by Simulated Occlusal Wear in Mature, Immature, and Deciduous Teeth

Figure 3

The enamel mechanisms of defense along the microcrack pathways. Different obstacles to microcracks were found in the enamel microstructure of all specimens. (a) Scalloping of the microcrack indicated that the crack followed the interrod spaces. (b) Bridging is defined as the incomplete separation of the enamel microstructure or ligaments. (c) The pathway of the microcrack was curved rather than straight. (d) Bifurcation of microcracks which divides the driving force between two cracks (rather than one) through the enamel microstructure.

(a)

(b)

(c)

(d)