抄録
A part of this study appeared previously as part I in this journal, vol.I, no.3.Theformer report revealed that bovine lamella is a tissue, running in the enamel, which consists of enamel rods and interrod substance. It contains more abundant organic matter than normal enamel.
The author attempted to investigate, in this research, the lamella tissue of human deciduous and permanent teeth. The result of this study clarified that human lamellae also are composed of organic enamel rods and interrod substance. Occasionally a section of lamella less than one micron wide is seen composed merely of interrod substance. Some lamellae show only their organic and nearly non-structural tissue.Therefore, distinction between enamel rods and interrod substance is almost impossible. By tracing morphological behaviors of enamel rods that remain along the lamella-enamel border, careful observation seems to reveal that these lamellae are also composed of enamel rods and interrod substance. A part of an enamel rod is sometimes clearly seen along the lamella enamel border that composes a part of the lamella tissue. These findings suggest that lamellae are not cracks ordefects in enamel filled withsoft tissue or organic matter as claimed by some scholars. Even though the lamella seems to be nearly non-structural, enamel rods and interrod substance likely compose the lamella tissue.
This morphological finding can probably be assumed to be lamellation (chang ing to lamellae) of enamel rods and interrod substance. However, the author has not intended to gain evidence to determine whether lamellation appears primarily or secondarily from an embryological viewpoint.
Needless to say, “lamella” and “lamellation” as compared by the author here have a nebulous histological differentiation.
The findings are described below accompanied with explanations of several electronmicrographs.
