| Project/Area Number |
06507004
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
矯正・小児・社会系歯学
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| Research Institution | TOKYO MEDICAL AND DENTAL UNIVERSITY |
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Principal Investigator |
KURODA Takayuki Tokyo Medical and Dental University, Faculty of Dentistry, Professor, 歯学部, 教授 (10013939)
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| Co-Investigator(Kenkyū-buntansha) |
MOTOHASHI Nobuyoshi Tokyo Medical and Dental University, Faculty of Dentistry, Lecturer, 歯学部, 講師 (10134735)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥45,500,000 (Direct Cost: ¥45,500,000)
Fiscal Year 1995: ¥8,500,000 (Direct Cost: ¥8,500,000)
Fiscal Year 1994: ¥37,000,000 (Direct Cost: ¥37,000,000)
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| Keywords | Computer Aided Designing / Set-up Model / 3-Dimensional Dental Model Analysis |
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| Research Abstract |
The purpose of this research is to develop three-dimensional computer aided designing system for diagnostic set-up model, and its preliminary clinical applications.
This system is composed of a measuring unit which obtains three-dimensional information from the dental cast using laser scanning and an engineering work station to generate the three-dimensional graphics. The dental cast is projected and scanned with a slit-ray laser beam and point location is determined through triangulation. The measurement error is less than 0.05 mm. For computed simulation of tooth movement, the respective planes defined by the anatomical reference points are formed for each individual tooth and are arranged along a guide line descriptive of the individual arch form. Subsequently, the three-diemnsional shape is imparted to each of the teeth arranged on the representative plane to form an arrangement of the three-dimensional profile. When necessary, orthognathic surgery may be simulated by moving the mandibular dental arch three-dimensionally to establish a proper occlusal relationship.
It took 150 minutes to generate a three-dimensional graphic image of the dental model and 40 minutes to generate the set-up model graphic image. Compared to hand-made set-up models, our computer model had such advantage as high-speed processing and quantitative evaluation on the amount of three-dimensional movement of the individual teeth relative to the craniofacial plane. Trial clinical applications demonstrated that the use of this system facilitated the otherwise complicated and time-consuming mock surgery for treatment planning in orthognathic surgery. In addition, clinical application of the three-dimensional dental model analysis demonstrated the change of palatal shape following upper dental arch expansion in the cleft lip and palate patients and the change of molar occlusion following surgical orthodontics in the jaw deformity patients.
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