| Project/Area Number |
08672220
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
補綴理工系歯学
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
UEDA Yasuo Hokkaido Univ., Fac.of Dent., Lecture, 歯学部, 講師 (30241342)
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| Co-Investigator(Kenkyū-buntansha) |
KOMATU Kousetu Hokkaido Univ., Fac.of Dent., Instructor, 歯学部, 助手 (90271668)
HIKITA Kazuhiro Hokkaido Univ., Fac.of Dent., Instructor, 歯学部, 助手 (20238281)
SATO Noriyuki Hokkaido Univ., Fac.of Dent., Instructor, 歯学部, 助手 (00271669)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1996: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | LIGHT CUTTING / DENTAL CAD / CAM / TOOTH CROWN FORM / MEASUREMENT |
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| Research Abstract |
The purpose of this study is mesurment and analisys tooth crown form and dental arch using digital CCD camera and light cutting method. Moreover we considered measuring the shape of tooth crown form in the mouth directly. At first, we made a special stage with 6 degrees of freedom. Then we examined the methods of measurments using slit light, cross-pattern, and maluti-value pattern, et al. From the result, we decided to use multi slit pattern. This pattern was constituted alternately white line (2 pixels width) and black line (32 pixels width). The image provided using CCD camera was handled by the dynamic threshold value, and it was converted into black and white image, and 3 dimensional value was calculated. Then, we considerd the problems of crook or dim of image coming from focusing in optics system, and concluded that it is easy to measure rough shape, but not enough to do a minute measurement for abutment tooth. If the shape of tooth is mesured directly in the mouth using this method, it is important to make up this system into small size that is possible to insert in a mouth. We think it need the new technology break through the problems.
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