| Project/Area Number |
03670897
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Conservative dentistry
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| Research Institution | Higashi-Nippon-Gakuen University |
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Principal Investigator |
KOWASHI Yusuke Higashi-Nippon-Gakuen University, School of Dentistry, Professor, 歯学部, 教授 (60014338)
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1992: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1991: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Periodontal tissue breakdown / Neutral proteinases / Connective tissue attachment / Fibroblast culture / DNA synthesis / Bruxism / Endotoxin / Alkaline phosphatase / 結合組織性付着 / アルカリホスファターゼ / 外傷性因子 / 歯根膜山来線維芽細胞培養系 / エラスタ-ゼ / カテプシンG / 歯肉溝滲出液 / 歯根膜由来線維芽細胞 / ELISA法 |
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| Research Abstract |
The tissue destructive neutral proteinases in the gingival crevice of 18 patients were determined by ELISA assay. The average concentrations of neutrophil elastase and cathepsin G in sites of minimum probing depth (1-2mm) were least. In crevices with moderate (3-5mm) and severe (6mm of more) depth there was increase of their concentrations in proportion to the depth. Those enzymes may play a significant role in tissue breakdown in gingival crevicular area.
As the following experiment, were examined the factors which influenced connective tissue attachment. Root slices were prepared from surgically extracted human normal and periodontally involved teeth. Each treated root slice was incubated in a well of 24-well plate containing 1x10^4 cells in 1ml of a-MEM. Morphological changes, the numbers of attached cells to the root slices, DNA synthesis and Alkaline phosphatase activity of the attached cells were determined. Fibroblasts on normal (unaffected) roots appeared flat and spindle-shaped. The cells on diseased root surfaces were rounded or slightly elongated. The number of cells attached on normal root slices was higher than on periodontally involved root slices on day 1 and 4 culture. The quantity of DNA of the cells on diseased root surfaces was inhibited to 50% of normal roots on day 1, 4 and 7 culture. Significant differences in the alkaline phosphatase activities of cells were found between cells attached on normal root slices and on diseased root surfaces through the 56 days of culture period. The amount of endotoxin eluted from periodontally involved root surfaces into media was significantly higher than from normal root surfaces.
It is suggested that our experimental system should be useful to determine the effects of tissue destructive proteinases on connective tissue attachment.
Furthermore, traumatic forces affected connective tissue attachment are continued to examine by means of the study of bruxism.
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