Studies on the teeth of Chlamydoselachus anguineus, a living archaic fish:I. On the morphology, structure and composition of the teeth

概要

論文の詳細を見る
The teeth of Chlamydoselachus anguineus, a living archaic fish, which was caughtin Suruga Bay, Japan, were investigated on their arrangement pattern, morphology, structure, attachmentpattern and composition by nacked eye observation, optical microscopic observation ofground and decalcified section, X-ray diffraction method and amino acid analysis. In the arrangement pattern and morphology of the teeth, Chlamydoselachus is very similar toCladoselache, a Devonian shark. Therefore, it is considered that Chlamydoselachus has one of themost primitive shark teeth type. The hard tissues of the tooth is consist of outer, inner and basal layer. The outer layer ishighly calcified tissue which covers the crown of the tooth. The inner layer is penetrated by ra-dial dentinal tubules extending from the dental pulp cavity. The basal layer is a osseous tissuewhich contains many small cavities. The tooth is supported on the jaws by both Sharpey's fiberswhich connect the basal layer of the tooth to the surrounding fibrillar connective tissue layer, and the epithelial attachment, the extension of the oral mucous epithelium. Also, this study made clear, that in Chlamydoselachus, the major mineral component of thetooth hard tissues is apatite, and the protein which is contained in the tooth hard tissues iscollagen.
歯科基礎医学会の論文