Historadiography of Tubular Enamel and Dentin of Osseous Piscine Teeth

Scanning Electron Microscopic Views of Tubular Enamel in a Fish (Samicosssyphus reticulatus)

“…However, the scanning electron microscopic study undertaken by us did not result in any kind of hint which might serve to elucidate possible relationship between the fibres and the tubules. As already reported by our use of historadiography [4], the peritubular hypercalcified dentin was not noted in a cross section of dentin tubule. …”

“…These were again in keeping with out findings here : the diameter of enamel tubule is 10 to 15 times larger than that of dentin accompanied by far more irregularity. The fact of inner wall of the enamel tubule being coarse was substantiated by our previous historadiographic study [4] . The arrangement of fibres constituting immature tubular enamels revealed by the stained section is quite similar to that of tubules which are observed in the ground section of mature tubular enamel [6 ,7].…”

Peritubular Hypercalcified Zone of Mammalian Dentin

“…HARCOURT (1964) detected well developed peritubular hypercalcified zones in sclerotic and translucent human dentins and ascribed them a role of protection for the tooth pulp. It was thought by ISOKAWA et al (1964) that the peritubular hypercalcified zone was a true structure in human adult dentin.…”

“…As for the peritubular area of animals, however, the available literature comprises only a limited number of historadiographic studies (ISOKAWA et al 1964;BLAKE, 1958;TAKUMA and his group, 1950TAKUMA and his group, , 1958TAKUMA and his group, , 1960. It is the purpose of this study to examine by means of a historadiographic method the peritubular zones of the dentin in a larger variety of mammals.…”

Study on the Developing Enameloid of a Fish (Hoplognathus fasciatus)

“…The fluorescence remains in dentinal tubules and, as suggested by ATKINSON and HARCOURT [16], the fluorescence may have a relation to the mineralization of peritubular matrix. On the other hand, there is a report to the effect that the peritubular hypercalcified zone cannot be historadiographically discovered in tubular dentin of fish (ISOKAWA et al [18]). …”