| Project/Area Number |
15390657
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Social dentistry
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| Research Institution | Tokyo Dental College |
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Principal Investigator |
MATSUKUBO Takashi TOKYO DENTAL COLLEGE, DEPARTMENT OF EPIDEMIOLOGY AND PUBLIC HEALTH, PROFESSOR, 歯学部, 教授 (90112804)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Tooru TOKYO DENTAL COLLEGE, DEPARTMENT OF CROWN AND BRIDGE, PROFESSOR, 歯学部, 教授 (50192092)
ONOZUKA Minoru KANAGAWA DENTAL COLLGE, DEPARTMENT OF PHYSIOLOGY, PROFESSOR, 歯学部, 教授 (90084780)
FUJITA Masafumi UNIVERSITY OF GIFU, DEPARTMENT OF ANATOMY, ASSISTANT PROFESSOR, 大学院・医学研究科, 講師 (50021449)
石川 達也 東京歯科大学, 歯学部, 教授 (30085708)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 2005: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2004: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2003: ¥3,500,000 (Direct Cost: ¥3,500,000)
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| Keywords | Auditory evoked response / MEG / Occlusion / New device to monitor occlusal pressure / Unilateral chewing / Chewing position / Clinical epidemiology / Audiometer |
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| Research Abstract |
The purposes of this study were (1)to examine the mechanism responsible for changes in hearing with the improved occlusal conditions seen in clinical cases, (2)to examine whether there was a relationship between unilateral chewing and hearing level, (3)to examine whether analysis of audiogram plotted by an audiometer could be use to evaluate patient's chewing-sites.
Study : Changes in auditory evoked magnetic fields (AEFs) were analyzed when subjects bite a cotton roll by magnetoencephalography (MEG). All ECDs for the three occlusal conditions localized in less than ±1mm compared with the control group. There were no significant differences in peak latency (ms) for the N100m of the AEF among all occlusal conditions and the control group. The response of AEFs decreased according to the strength of biting pressure in all subjects. The response in the right hemisphere was higher than for the left hemisphere under the experimental conditions. The response was significantly smaller in the ri
… More
ght hemisphere as biting on the same side.
We need to conduct further studies to confirm the role of : 1)changes in the anatomical structure of the auris media and auris interna due to shifting in the temporomandibular joint (TMJ), 2)innervating neurarchy in the auris media and auris interna, and 3)gate control theory which is the suppression phenomenon in sonic sensation.
Study II-1 : Subjects participated in this study was 262, who visited the dental office in Tokyo. In this clinic, healing levels of the most of patients were measured by audiometer. We used the patient's audiogram before and after dental treatment and chewing instruction. We attempt to classify the patterns of hearing levels at all wavelengths (Hz) and summarized as five groups. Sex and age distribution in each class was analyzed and also comparison of audiogram before and after dental treatment and chewing instructions was performed by paired t-test using SAS software Ver. 8.2.
Data suggest that 1)Unilateral chewing had clearly affected hearing ability, 2)Our classification is useful to make diagnosis chewing site of the patient and also it can be useful to evaluate dental treatments, and 3)Dental treatment have possibility to improve hearing ability of patients.
StudyII-2 : There were 20 subjects (3 females, 17 males, aged 27- 58) who visited a dental clinic. Individual written informed consent to this study was obtained before the experiment, which was approved by the Ethics Committee of the TDC. We conducted a questionnaire, oral examination, occlusal examination with an Occluzer (GC FPD-707), and the Sirognathograph Analyzing System (Tokyo Shika Sangyo). We also made a plaster cast of the subjects' teeth on their first visit. We evaluated each subject's dynamic function with a combination of these five techniques and pattern analysis.
The results revealed that a more detailed evaluation of dynamic occlusal and chewing functions can be undertaken by combining pattern analysis with conventional evaluations. Less
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