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Distributional Changes of Osteoclasts and Pre-osteoclastic Cells in Periodontal Tissues during Experimental Tooth Movement as Revealed by Quantitative Immunohistochemistry of H+-ATPase

The Departments of Oral Anatomy, Department of Orthodontics, School of Dentistry, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142, Japan

T. Sasaki

The Departments of Oral Anatomy

Y. Shibasaki

Department of Orthodontics, School of Dentistry, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142, Japan

To investigate the mechanism of alveolar bone remodeling in response to orthodontic force application, we examined the distribution of osteoclasts and pre-osteoclastic cells using quantitative immunohistochemistry of vacuolar-type H+-ATPase. For orthodontic force to be produced by the Waldo method, an orthodontic elastic band was inserted between the upper first and second molars of rats. The observed areas of periodontal tissues around second molars were the distal surfaces of mesial roots, as the pressure side, and the mesial surfaces of distal roots, as the tension side. Specific expression of vacuolar-type H+-ATPase at the ultrastructural level was detected in mononuclear and multinucleated pre-osteoclastic cells, as well as osteoclasts with ruffled borders on bone surfaces. At 6 hrs after orthodontic force application, many osteoclasts and pre-osteoclastic cells with H+-ATPase expression were first observed in vascular canals of the alveolar bone crest near the pressure side of the periodontal ligament, but the number of osteoclasts was not increased in the periodontal ligament. On day 1 after tooth movement, osteoclasts were increased in number in the periodontal ligament and in adjacent alveolar bones on the pressure side, but were seldom observed in corresponding areas on the tension side. The number of osteoclasts increased until day 7, but had decreased by day 14. These results suggest that, in bone remodeling during experimental tooth movement, (1) osteoclasts and pre-osteoclastic cells can be identified by H+-ATPase immunohistochemistry, (2) osteoclasts and pre-osteoclastic cells are rapidly induced after force application, (3) osteoclast induction first occurs in vascular canals of the alveolar bone crest on the pressure side, and then, (4) the number of osteoclasts increases in the periodontal ligament on the pressure side.

Key Words: osteoclast • H+-ATPase • bone resorption • tooth movement • immunohistochemistry.

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Journal of Dental Research, Vol. 76, No. 1, 580-587 (1997)
DOI: 10.1177/00220345970760010901


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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 Yokoya, K. Articles by Shibasaki, Y. Search for Related Content PubMed PubMed Citation Articles by Yokoya, K. Articles by Shibasaki, Y. Social Bookmarking                         What's this?