CLINICAL RESEARCH
b
a
d
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Fig 6 The frontal longitudinal tooth section was submerged in distilled water and photographed on a black background. Despite using the same amount of direct reflective illumination per exposure, a direc- tional change of 90 degrees reveals stunning and complex light transmissive and reflective pathways, emphasizing the optical anisotropy of dentin. Sharp details and remarkable contrast within the dentin shade is seen (c) . Pronounced backscattering across the enamel prisms and the dentin tubules render a diffuse appearance obscuring critical details as evident in depiction (d) , based on incident light direction. Paral- lel illumination with respect to the long axis of the tooth present on the left and perpendicular on the right.
336 THE INTERNATIONAL JOURNAL OF ESTHETIC DENTISTRY VOLUME 9 • NUMBER 3 • AUTUMN 2014
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