Grant-in-Aid for Scientific Research (A).
|Research Institution||Toyota Technological Institute|
SATA Toshio Toyota Technological Institute, Faculth of Engineering Professor, 工学部, 教授 (80010594)
ITO Gakuji Kagoshima University, Dental School, Professor, 歯学部, 教授 (60005064)
SUWA Gen The University Museum, The University of Tokyo, Associate pROFESSOR, 総合研究博物館, 助教授 (50206596)
中島 耕一 豊田工業大学, 工学部, 教授 (90148346)
YOSHIZAWA Toru Tokyo A&T University, Faculty of Technology, Professor, 工学部, 教授 (80020387)
ESAHSHI Masayoshi Tohoku University, New Industry Creation Hatchery Center, Professor, 未来科学技術共同研究センター, 教授 (20108468)
HONDA Fumihiro Toyota Technological Institute, Faculty of Engineering, Professor, 工学部, 教授 (20005953)
|Project Fiscal Year
1997 – 1999
Completed(Fiscal Year 1999)
|Budget Amount *help
¥27,400,000 (Direct Cost : ¥27,400,000)
Fiscal Year 1999 : ¥5,800,000 (Direct Cost : ¥5,800,000)
Fiscal Year 1998 : ¥6,400,000 (Direct Cost : ¥6,400,000)
Fiscal Year 1997 : ¥15,200,000 (Direct Cost : ¥15,200,000)
|Keywords||Biting Force Sensor / Analysis of Tooth Wear / Analysis of Jaw Movement / Masticatory Organ / Masticatory Function / 咬合力センサ / 咬耗測定 / 顎運動測定 / 咀嚼器官 / 咀嚼機能|
(1) Development of sensors for occlusal force and relative motion of teeth (Esashi, Kuroe, Inoue, Kuwabara) An occlusal force sensor based on a capacitance change and a relative motion sensor based on a magnetic coupling were fabricated by micromachine technology. These sensors were implanted in the artificial teeth for the experiment and the occlusal force and the motion were measured. These sensors were applied for various measurements in dental research.
(2) Precise measurement of jaw movement by pattern projection method (Yoshizawa, Kuroe, Inou) We developed a measurement system with the accuracy of 0.1mm at the intermittent rate of 1/60 second and measured three dimensional movement of a jaw when a grown-up man, a child or an infant masticates.
(3) Microscopic determination of the specific wear rate of tooth surface (Honda, Mohri) Measurement and analytical method of the tooth wear rate are examined. The proposed method using Ti coating and x-ray measurement is useful to determine t
he wear rate of patient's tooth within 1 nm of error.
(4) Three-demensional measurement of enamel distribution (Suwa) We developed a method of reconstructing the three-dimensional distribution of enamel in human molars. Using this method, we investigated the enamel distributional characteristics of human molars, and evaluated existing methods based on thickness measures taken on controlled and arbitrary sections.
(5) Analysis of the relation between dental wear and three-dimensional cranial structure (Mizoguchi) It was confirmed through multivariate analyses that three-dimensional cranial structure was associated with dental wear and with vertebral morphology.
(6) Comparative analysis of tooth wear patterns among hominoids (Uchida) Morphological variation of the mandibular molar in the extant and Miocene hominoids was analyzed.
(7) Development of clinical diagnostic test of masticatory function using a tooth-bearing sensor (Ito, Kuroe, Inoue). Using a pair of tooth-bearing sensors designed by Prof. Esashi, the biting force and the reciprocal movement of upper and lower molars were analyzed to develop a clinical diagnostic test of masticatory function with high accuracy.
(8) Evaluation of the development of masticatory system and its relation to diet (Inoue, Sakashita) Dental wear was evaluated on dental casts of infants and the relation among dental wear, ability of masticatory system, diet was studied.