オポッサムの歯の発生様式ならびに細管エナメル質の構造と機能に関する研究

DOI 被引用文献1件 参考文献60件

書誌事項

タイトル別名
  • On the developmental aspect of tooth germs, and the structure and function of tubular enamel in the opossum(Monodelphis domestica).

この論文をさがす

抄録

The aim of this study is to examine the developmental aspect of the dental lamina and the tooth germ, the structure of the tubular enamel and the function of the enamel tubules in the marsupial, opossum (Monodelphis domestica). The dental formula of the animal used in the present study was 5134/4134=50. In 12-, 16-, and 18-day-old opossum, the tooth germs of the upper and lower deciduous canines, third deciduous molars and first molars, and the upper first deciduous incisor and second molar had successional dental laminae and the replacement tooth germ. The tooth germs of the upper fourth deciduous incisor and the lower first deciduous incisor were reduced. The dental lamina was continued in each jaw except for the upper first deciduous incisor. This dental lamina continued with the oral epithelium in the mesial or distal region of each tooth germ, except for the lower third molar. The first dentition (deciduous dentition) remained as the permanent dentition on the upper first deciduous incisor, and the upper and lower deciduous canines and first molars. The upper fourth incisor and the lower first incisor were the second dentition (successional dentition). The third deciduous molars were replaced by the third premolars in both jaws. Tissue differentiations such as the enamel knot, enamel cord and stratum intermedium were observed as in eutherian mammals. Most enamel prisms, surrounded by interprismatic enamel, ran obliquely from the dentinoenamel junction (DEJ), and bent near the enamel surface. The enamel tubules were distributed in both enamel prisms and the interprismatic enamel near the DEJ. Several enamel tubules ran within one enamel prism. From the middle to the surface of the enamel, one enamel tubule ran in a single enamel prism. One enamel tubule continued from the DEJ to near the enamel surface, and was speculated to develop in relation to one ameloblast. The fiber of the odontoblast process continued from the dentinal tubule distributed in the enamel tubule and branched across the enamel prisms. The odontoblast process may be involved in the formation of enamel tubules. After in vivo injection, strontium chloride and tetracycline were detected in the enamel tubules and near the enamel surface. In conclusion, there was active transport by the odontoblasts and their processes through the enamel tubules.

収録刊行物

被引用文献 (1)*注記

もっと見る

参考文献 (60)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ