| Project/Area Number |
03671079
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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 |
医学一般
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
YAMAMOTO Katsuyuki Hokkaido University, Fac. of Engineering, Professor, 工学部, 教授 (10088867)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMIZU Koichi Hokkaido University, Fac. of Engineering, Associate Professor, 工学部, 助教授 (30125322)
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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: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1991: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | orthodontics / three-dimensional measurement / dental cast / computer supporting system / treatment planning / finite element method |
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| Research Abstract |
Orthodontic treatment must be conducted over a period of a few years on a patient, depending on experience and skill of an orthodontist. We have studied feasibility of a computerized support system for orthodontic treatment and demonstrated enormous potentialities to optimize a treatment procedure.
(1) A computerized planning system for the treatment has been developed, which allows an orthodontist to construct a setup model on a computer graphic display. This system is based on the 3D movements of dental cast profile data obtained by our apparatus previously developed. Using this system an orthodontist can predict quantitatively the 3D movement of each tooth prior to the treatment. (2) We have also developed a system to readjust an orthodontic appliance on the basis of 3D tooth movements during the treatment and orthodontic forces. The magnitude and direction of the forces, including the momentum caused by anti-rotation and gable bends, are obtained by a finite element method (FEM). (3) We estimated a resorption rate of alveolar bone on patients. The rate was obtained from both the 3D tooth movement and the stress distribution calculated with a FEM model of a tooth, periodontal membrane and alveolar bone. The resorption was correlated well with the stress and was found to be about 4 mum/g/mm^2/day. (4) To evaluate the occlusal contact the system was also applied to the measurement of distance distribution between upper and lower teeth. The occlusal contact area increased during the treatment. This result verifies the usefulness of the system as a mean of treatment evaluation.
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