Fig 4 The coronal dentin surface can be considered a three-dimensional configuration of the dentinoenamel junction 20 . When macroscopically observed, a high degree of conformity exists between the gross form of the dentinoenamel junction and the overlying enamel surface 21-23 , the significant exception being the localized enamel thickness on the buccal and lingual middle thirds of the crown, forming a transitional sigmoidal curve distribution. biochemical compositions (FIG 2): i) enamel serving as the structural protective shell and ii) dentin serving as the structural dampening core. (FIG 3a) The enamel and dentin demarcation is due to the difference of birefringence between the tissues. (FIG 3b) The DEJ is less mineralized than either enamel or bulk dentin, conversely being
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