| Project/Area Number |
62570907
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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 |
外科・放射線系歯学
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| Research Institution | Kanagawa Dental College |
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Principal Investigator |
KASHIMA Isamu Kanagawa Dental College, Oral Radiology, Associate Professor, 歯学部, 助教授 (00130914)
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| Co-Investigator(Kenkyū-buntansha) |
TOMOMATU Eiko Kanagawa Dental College, Periodontology, Instructor, 歯学部, 助手 (90172204)
閑野 政則 神奈川歯科大学, 歯学部, 技師長
KANNO Masanori Kanagawa Dental College, Oral Radiology, X-ray technician
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Power spectrum / Computed panoramic tomography / laser scan system / Dental xeroradiography / パワースペクトラム / デジタルラジオクラフイー / コンピュータパノラマ断層写真 / 空間周波数 |
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| Research Abstract |
The bone structure consists basically of the periostium, bone cortex and intramedullary cavity. The cancellous bone forming the intramedullary cavity is visualized as a linear or reticular pattern of bone trabeculae on the radiographic images. The bone tissue is a metabolic one that undergoes repeated resorption and formation. In paticular, the mineral content of the cancellous bone fluctuates in close response to changes in bone metabolism. Generally it has been said that bone loss and calcification of abnomalities can be detected by conventional radiography when the bone demineralization or hypermineralization is more than 30 to 40 percent.
Panoramic tomography, a procedure which is relatively standardized, was employed because it is simple to manipulate and allows evaluation of the entire mandible. Because of the blurred images specific to tomographs, conventional panoramic tomographs are not suitable for the visual analysis of patterns of the mandibular bone trabeculae. This problem was overcome by using a laser scan sytem, which visualized the trabecule quite clearly and allowed relatively accurate classification of the patterns on the image produced. In addition, we were able to evaluate quantitaitvely and qualitatively the distribution of X-ray in relation to information on the bone trabeculae on the digitalized imaging plate a physical procedure.
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