Abstract
The morphology of the outer “prismless” enamel of deciduous human teeth was investigated by polarized light microscopy, microradiography, X-ray diffraction analysis and electron microscopy. Replicas were prepared from the longitudinal cut surface of each tooth halved through its long axis. In addition, longitudinal ground sections approximately 30μ thick were also prepared. The difference in crystallite arrangement between the “prismless” and underlying enamel, as indicated by a difference in extinction behaviour between the two enamel sites and the formation of a double arc in the (002) position of the diffractograms, was illustrated by electron microscopy. The general crystallite direction in the “prismless” enamel was approximately perpendicular to the enamel periphery, while the underlying enamel showed a spread in crystallite direction.
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