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Changes in the Microvasculature after Mechanical Pressure on the Hamster Cheek Pouch

First Department of Orthodontics, School of Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima Bunkyo-ku, Tokyo 113, Japan

S. Inage

First Department of Orthodontics, School of Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima Bunkyo-ku, Tokyo 113, Japan

S. Kurihara

First Department of Orthodontics, School of Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima Bunkyo-ku, Tokyo 113, Japan

F. Miura

First Department of Orthodontics, School of Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima Bunkyo-ku, Tokyo 113, Japan

The reaction of the microvasculature in the periodontal ligament to mechanical pressure is considered a very important phenomenon with respect to the biological background to orthodontic tooth movement. For clarification of the microvascular reaction to mechanical pressure, an experimental model that incorporated a hamster cheek pouch was established. This in vivo model solves some of the problems of other experimental models of the microvasculature of the periodontal ligament. Blood plasma permeation in this model was examined by means of a blue dye (pontamine sky blue), and histological observation was performed by light and transmission electron microscopy.

Increased vascular permeability was observed within 30 min after removal of the mechanical stimulation. The threshold weight resulting in dye leakage was between 1 and 5 g applied for 60 min. From the histological observations, some large gaps between the endothelial cells in venules were found, while most basement membranes remained undisturbed. These observations suggest that the plasma leakage was due to mild traumatic injury to the endothelial cells. Both leukocytes and platelets were observed in the gaps between the endothelial cells in the venule. These types of microvascular reactions to mechanical pressure could initiate tissue changes in the periodontal ligament during orthodontic tooth movement.

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Journal of Dental Research, Vol. 71, No. 6, 1304-1309 (1992)
DOI: 10.1177/00220345920710060701


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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Da, J. Articles by Miura, F. Search for Related Content PubMed PubMed Citation Articles by Da, J. Articles by Miura, F. Social Bookmarking                         What's this?