| Project/Area Number |
60570949
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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, 講師 (00130914)
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| Co-Investigator(Kenkyū-buntansha) |
TOMOMATU Eiko Kanagawa Dental College, Periodontology, Instructor, 歯周病学教室, 助手 (90172204)
KANNO Masanori Kanagawa Dental College, Oral Radiology, X-ray Technician
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1986: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1985: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Power spectrum / Computed panoramic tomography / Laser scan system / Dental xeroradiography / Digital radiography / デジタルラジオグラフィー |
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| Research Abstract |
The bone structure consists basically of the periosteum, 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 abonomalities 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 system, which visualized the trabeculae quite clearly and allowed relatively accurate classification of the patterns on the image produced.
In addition, we were able to evaluate quantitatively and qualitatively the distribution of x-ray energy in relation to information on the bone trabeculae on the digitalized imaging plate using a physical procedure.
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