CLINICAL RESEARCH
DENTIN
DEC
ENAMEL
Fig 5 Light interactivity model. From the cervical to the incisal regions, the dominance of the dentin core gradually gives way to that of the enamel shell respectively, achieving a brief equilibrium in the middle region. Multi-directional forms of scattering (colored arrows) and refractive index variations between the enamel/dentinoenamel complex/dentin substrates create infinite photonic pathways, collectively rendering a unique visual synthesis depending upon the incident light direction and intensity.
334 THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY VOLUME 9 • NUMBER 3 • AUTUMN 2014
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