Grant-in-Aid for Scientific Research (B).
|Research Institution||The University of Tokushima, School of Dentistry|
BANDO Eiichi The University of Tokushima, School of Dntistry, Professor, 歯学部, 教授 (00014168)
SUZUKI Atsushi The University of Tokushima, School of Dentistry, Research Associate, 歯学部, 助手 (80196790)
近藤 一雄 徳島大学, 歯学部, 助手 (00195893)
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)
KORI Motoharu The University of Tokushima, School of Dentistry, Research Associate, 歯学部, 助手 (50253216)
|Project Fiscal Year
1992 – 1994
Completed(Fiscal Year 1994)
|Budget Amount *help
¥6,500,000 (Direct Cost : ¥6,500,000)
Fiscal Year 1994 : ¥1,000,000 (Direct Cost : ¥1,000,000)
Fiscal Year 1993 : ¥1,900,000 (Direct Cost : ¥1,900,000)
Fiscal Year 1992 : ¥3,600,000 (Direct Cost : ¥3,600,000)
|Keywords||Jaw tracking device / Jaw movement in six-degree of freedom / Mandibular movement / 顎運動測定器 / 6自由度顎運動 / 下顎運動 / 顎口腔系 / 診断システム|
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
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.