| Project/Area Number |
15592162
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Orthodontic/Pediatric dentistry
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| Research Institution | OKAYAMA UNIVERSITY |
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Principal Investigator |
TANIMOTO Yuko Okayama University, Graduate School of Medicine, Dentistry and Pharmaceutial Sciences, Assistant Professor, 大学院・医歯学総合研究科, 助手 (20190754)
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| Co-Investigator(Kenkyū-buntansha) |
TAKANO Teruko (YAMAMOTO Teruko) Okayama University, Graduate School of Medicine, Dentistry and Graduate School of Medicine, Graduate School of Medicine, Graduate School of Medicine, Pharmaceutial Sciences, Professor and Chair, 大学院・医歯学総合研究科, 教授 (00127250)
MIYAWAKI Shouichi Okayama University, Graduate School of Medicine, Dentistry and Pharmaceutial Sciences, Associate Professor, 大学院・医歯学総合研究科, 助教授 (80295807)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2003: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | Bruxism / electromyogram(EMG) / magnetic resonance imaging(MRI) / Osteoarthrosis / Temporomandibular joint(TMJ) / Temporomandibular disorder(TMD) / Internal derangement of TMJ / Masticatory movement |
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| Research Abstract |
Adult volunteers were recruited as subjects. Bruxism patients were diagnosed based on the following clinical criteria : a history of tooth-grinding occurring more than 3 times a week for at least 6 months, jaw muscle fatigue or discomfort in the morning and the presence of tooth wear. Furthermore, the patients were examined using an electromyogram (EMG) recording system along with a video recorder in their homes and were confirmed according to the following experimental criteria : more than 4 bruxism episodes occurred per hour, more than 25 EMG bursts per hour, and more than 2 tooth-grinding sounds per night.
The mean frequency and duration of bruxism episode in bruxism patients were higher and longer than those in normal subjects, respectively. The incidence of temporomandibular disorders(TMDs) including internal derangement of TMJ and osteoarthrosis of TMJ in bruxism patients is significantly higher than that in normal subjects.
Therefore, it is suggested that the sleep bruxism is one of the causes of TMDs.
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