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- W2029771479 abstract "Lymphatic drainage and circulation in periodontal tissues have been cited as important components of host defence and pathogenic mechanisms, but quantitative data are sparse because of the technical difficulties associated with small animal lymphatic studies. However, the lymphatic vessels draining the periodontal tissues and surrounding region are sufficiently large in sheep to permit surgical placement of lymphatic catheters. Consequently, lymph and recirculating lymphocytes can be continuously collected and this permits the quantitative assessment of local immune responses in these tissues. We have studied the lymphatic drainage pathways from the labial gingival tissues in sheep by two methods. First, in a series of anatomical studies (n=6), a complex of Evan's blue dye and albumin was injected into the labial gingival tissues. One hour after injection the animals were sacrificed and the submandibular and cervical regions were dissected to expose the stained lymphatics. This anatomical study demonstrated 2 major drainage pathways: 1) cervical lymph ducts and; 2) efferent prescapular lymphatics. Secondly, to compare the relative importance of these two drainage pathways, radiolabeled protein (125I-albumin) was injected directly into the gingival tissues and its appearance in the cervical and prescapular lymph was measured (n=7). Despite the technical difficulties encountered in the experiments, data collected showed that over 7.5 h, 64.7% of the injected protein was recovered in the prescapular and cervical lymph vessels (31.8±6.5% and 32.9±8.5%, respectively). In addition, 11.9±2.1% of the injected protein was transported to the blood by routes not involving the cannulated cervical and prescapular lymph vessels. With most of the remaining radiolabeled protein (17.9±4.9%) recovered from the injection site, we were able to account for approximately 95% of the injected protein. This study suggests that the lymph drainage from this region in the sheep model could provide one of the best described closed and contained systems and thus, could be a useful system for future continous monitoring of inflammatory responses during experimental periodontal diseases." @default.
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- W2029771479 date "1996-11-01" @default.
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- W2029771479 title "Lymph and interstitial fluid dynamics in labial gingival tissues of sheep" @default.
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- W2029771479 doi "https://doi.org/10.1111/j.1600-0765.1996.tb00522.x" @default.
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