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. Author manuscript; available in PMC: 2009 Jul 1.
Published in final edited form as: J Dent Res. 2008 Jul;87(7):645–649. doi: 10.1177/154405910808700711

Figure 1.

Figure 1

Optical micrographs of rat incisors cut in the mid-sagittal (a) and transverse (b) planes, which are normal to each other; black lines outline the dentino-enamel junction (DEJ). SEM-BSE micrographs of enamel polished in the mid-sagittal (c) and transverse (d) planes illustrate the difference in the enamel rod organization in these 2 planes. Note that the crack in (b) is a consequence of specimen preparation. Since the samples were not embedded, but rather were mounted in resin, the pulp cavity remained unfilled; this led to macrocracking of the sample during polishing. However, this crack did not affect the enamel integrity at the microscopic level.