乳歯歯根膜における毛細リンパ管の分布ならびにその構造について

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  • The Study of the Distribution and the Structure of Lymphatic Vessels in the Periodontium of Deciduous Teeth

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The structure and distribution of lymphatic vessels in the periodontium of deciduous teeth with and without physiological absorption of the dental roots were investigated, using 31 hybrid dogs from 2 to 6 mouths of age.<BR>After being anesthetized with pentobarbiturate administered intraperitoneally, the dogs were perfused with 3.3% sodium sulfate solution from the common carotid artery and were injected with 0.8-0.9% silver nitrate solution containing Indian ink and Indian ink solution, using hand pressure. After that, the animals were fixed in 4% paraformaldehyde, and the maxilla and mandibule were resected. The excised jaw specimens were examined by microradiography. These specimens were then demineralized using PlankRychlo demineralizing solution, and were cut into 20 blocks. After being dehydrated, the specimens were embedded in Paraffin, and were serially sectioned sagittally at a thickness of 40 to 50 μm. The sections were exposed to ultraviolet rays.<BR>Result: It was found that the lymphatic vessels in the periodontium run along the axis of the tooth closer to the alveolar bone at the cervical regions and were contributed with plexus at the root apex regions, with and without physiological absorption of the dental roots. Some branches communicated with lymphatic vessels in the bone-marrow, through Volkmann's canals in the alveolar bone. Many lymphatic vessels were accompanied by blood vessels. When the distrbution of the lymphatic vessels was compared with the regions in one tooth, there were more lymphatic vessels on the distal side than on the mesial side of the tooth, and there were more lymphatic vessels on the lingual side than on the buccal side of the tooth. In addition, there were more lymphatic vessels in the posterior deciduous molars than in the anterior deciduous molars. The nets of blood vessels were formed and the number of lymphatic vessels increased closing these nets of blood vessels at the absorption cavities of the sites where physiological absorption of the root was detected. These results suggest that the courses and distribution of the lymphatic vessels may markedly affect the progress of periapical lesions and the prognosis of endodontic treatmant.

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