1989 Fiscal Year Final Research Report Summary
FUNCTIONAL RELATIONS BETWEEN JAW, HEAD, NECK AND BACK MUSCLES
| Project/Area Number |
63480432
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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 | NAGASAKI UNIVERSITY |
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Principal Investigator |
FUJII Hiroyuki NAGASAKI UNIV., DEPT. OF REMOVABLE PROSTHODONTICS PROFESSOR, 歯学部, 教授 (20067060)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Yasushi NAGASAKI UNIV., DEPT. OF REMOVABLE PROSTHODONTICS ASSISTANT, 歯学部, 助手 (70198240)
SHIRAISHI Kazuhiro NAGASAKI UNIV., DEPT. OF REMOVABLE PROSTHODONTICS ASSISTANT, 歯学部, 助手 (50196599)
YAMABE Yoshihisa NAGASAKI UNIV., DEPT. OF REMOVABLE PROSTHODONTICS ASSISTANT, 歯学部, 助手 (90191379)
TAKADA Hidetoshi NAGASAKI UNIV., DEPT. OF REMOVABLE PROSTHODONTICS ASSISTANT, 歯学部, 助手 (60179455)
EGASHIRA Kouji NAGASAKI UNIV., DEPT. OF REMOVABLE PROSTHODONTICS ASSISTANT, 歯学部, 助手 (10176753)
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| Project Period (FY) |
1988 – 1989
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| Keywords | MASTICATORY MUSCLES / NECK MUSCLES / BACK MUSCLES / HORIZONTAL JAW MOVEMENT / POSTURE / OCCLUSAL DISEASE / SHOULDER STIFFNESS / EMG |
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| Research Abstract |
1. As a pre-experimental study, discomfortableness in the head, neck, shoulder and back regions was observed in 23 healthy subjects. It was conformed that Unpleasant, Fatigate, Painful, Suffocative, Dyskinesthetic and Forocious sensations was able to be induced by loading of isometric horizontal jaw movement which implied functional relations between the jaw, head, neck and back muscles.
2. (1) Eight healthy participants performed horizontal isometric jaw movements with maximum voluntary contractions of the jaw muscles until they could not tolerate the task. Electromyographic activities bilaterally recorded from the superior and inferior regions of the sternocleidomastoid muscle and the nuchal and shoulder regions of the trapezius muscle were observed.
(2) In more than 94% of 32 trials, the amplitude of EMGs during the task were higher than those at rest, and in more than 78%, temporal changes in EMG burst were synchronized with the onset-offset of the exercise.
(3) In more than 72% of al
… More
l trials, small amplitude EMG lasted after cessation of the task.
(4) Muscle activities of the lateral cervical region during the exercise were superior to the activity of the nuchal and shoulder regions, and amplitude of EMGs in the neck and shoulder regions tended to be the highest during isometric retrusion.
3.(1) Eleven Healthy Participants were made to perform isometric horizontal jaw movements with maximum voluntary efforts in various postures. Surface EMGs from the laterocervical, nucha, shoulder and back regions were bilaterally picked up, and simultaneously recorded with jaw force.
(2) Electromyographic power value in these regions depended on the directions of the jaw exercises (posteriorly pull > posterolaterally pull > anteriorly push = anterolaterally push, P<0.0001).
(3) The directional effects mentioned above were significantly obvious in the inferior laterocervical (Electrode No.2) and back (Electrode No.5) regions (P<0.0001).
(4) The postural effects on the power value were varied with the directions of the jaw exercises (P<thermodynamics>0.03);i.e., the highest value during jaw pull was observed in an upright position, while that during jaw push was found in a supine position Less
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