1997 Fiscal Year Final Research Report Summary
Evaluation of stomatognathic functions through analysis of head movement : A new concept
| Project/Area Number |
07407055
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | Niigata University |
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Principal Investigator |
KOHNO Shoji Niigata University School of Dentistry Professor, 歯学部, 教授 (50014098)
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| Co-Investigator(Kenkyū-buntansha) |
TUCHIDA Yukihiro Niigata University School of Dentistry Assistant Professor, 歯学部, 助手 (60251831)
KOBAYASHI Hiroshi Niigata University School of Dentistry Associate Professor, 歯学部, 助教授 (00225533)
NOMURA Shuichi Niigata University School of Dentistry Professor, 歯学部, 教授 (40018859)
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| Project Period (FY) |
1995 – 1997
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| Keywords | head movements / jaw movements / coordinated head movement |
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| Research Abstract |
The coactivation of mastication and neek muscles during functional and rhythmical mandibular movements has been demonstrated. We hypothesized that the head moves rhythmically and coordinately with the mandibule during function. To prove the validity of our hypothesis we examined the existence of periodicity of head movement during tapping. Healthy male adults, mean age 25.5, with normal occlusion and without TMD history were selected as subjects. Using photo-electrical measuring system, we measured tridimensionally both the movement of the head and mandible by tracking upper and lower incisal points respectively during tapping movements.
The head moved periodical and rhythmically, as the mandible does. The upper incisal point moved in opposite direction to the mandible. During opening the head moved in a cranial direction ; during closing moved in a caudal direction. The cycle time of head and mandibular movements showed a correlation coefficient of o.94. The average vertical range of movement for the head was1.2(]SY.+-。[)0.6mm, and 16.9(]SY.+-。[)3.0mm for the mandible. The range of head movements were proportional to those of the mandible with a correlation cofficient of 0.74.
From these results we conclude that during tapping the head moves in functional coordination with the mandible movement.
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