dentinogenesis 16 . This extended dentinoenamel complex (DEC) has been histologically described 17 and observed as a functionally graded interphase between two vastly bio-mechanicaly different tissues, that provides crack tip shielding 18 , partially accomplished by a localized reduction in density and mineralization, in both enamel and dentin as they approximate their junction 19 (FIG 3c.) Fig 6 A pronounced dentin concavity is present on the buccal surface at the junction of the cervical land middle thirds of the posterior dentition, forming a sigmoid curve. This localized enamel over expression may present a selective bio-mechanical reinforcement mechanism to the compressive loads experienced in the posterior dentition. Mandibular second molar depicted.
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