1994 Fiscal Year Final Research Report Summary
A study on improvement and application of intra oral jaw tracking device in six-degree of freedom
| Project/Area Number |
04454487
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
補綴理工系歯学
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| Research Institution | The University of Tokushima, School of Dentistry |
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Principal Investigator |
BANDO Eiichi The University of Tokushima, School of Dntistry, Professor, 歯学部, 教授 (00014168)
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| Co-Investigator(Kenkyū-buntansha) |
KORI Motoharu The University of Tokushima, School of Dentistry, Research Associate, 歯学部, 助手 (50253216)
SUZUKI Atsushi The University of Tokushima, School of Dentistry, Research Associate, 歯学部, 助手 (80196790)
IKEDA Takashi The University of Tokushima, School of Dentistry, Research Associate, 歯学部, 助手 (30193204)
FUJIMURA Tetsuya Tokushima Bunri University, Faculty of Engineering, Assistant Professor, 工学部, 講師 (80219047)
NAKANO Masanori The University of Tokushima, School of Dentistry, Associate Professor, 歯学部, 助教授 (30136262)
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| Project Period (FY) |
1992 – 1994
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| Keywords | Jaw tracking device / Jaw movement in six-degree of freedom / Mandibular movement |
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| Research Abstract |
The Purpose of this research is to develop a new jaw tracking device by using two magnetic fields in quadrature phase. The overall features of this device are as follows. 1) The device measures upper and lower jaws movement independently in six degrees of freedom. 2) That has no mechanical connection between upper and lower jaws and does not prevent any natural jaw function as mastication, 3) The accuracy is 10 micrometer and sampling rate is 300 Hz, 4) The intra oral sensor parts are small enough not to disturb any dental practice usuing in daily dental clinics.
The device involves large primary coils which make magnetic fields and small secondary coils which are attached to upper and lower jaws. Locations of jaw are correspond with out-put signals of secondary coils induced by magnetic fields.
We tested several type devices.
1. Primary coil : 1) Air core coil of 60cm cube
2) Air core coil of 180cm cube
3) Permalloy core coil of 45cmx38cmx18cm rectangular parallelepipes
2. Phase detector : 1) Comparator and 16 bit up-down counter
2) FFT
This study revealed that 18-24 bit A/D converter, 64 bit CPU and 1024-8192 points FFT analysis are required for extremely high resolution jaw movement analysis.
All basic technical problems for developing the new jaw tracking device are resolved by this study.
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