| Project/Area Number |
08672258
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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 |
補綴理工系歯学
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| Research Institution | The Nippon Dental University |
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Principal Investigator |
AKIYAMA Hitoshi The Nippon Dental University, Faculty of Dentistry Deportment of partial and Complete Denture Assistant Professor, 歯学部・歯科補綴学教室・第1講座, 講師 (60231841)
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| Co-Investigator(Kenkyū-buntansha) |
KOBAYASHI Yoshinori The Nippon Dental University, Faculty of Dentistry Deportment of partial and Com, 歯学部・歯科補綴学教室・第1講座, 教授 (20095102)
SHIGA Hiroshi The Nippon Dental University, Faculty of Dentistry Deportment of partial and Com, 歯学部・歯科補綴学教室・第1講座, 助教授 (50226114)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1998: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1997: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1996: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Temporomandibular disorder / Frankfurt plane / Occlusal plane / 3 dimensional measuring system |
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| Research Abstract |
In order to find occiusal factors related to TMD (Temporomandibular disorders), the inclination of the occiusal plane as seen from frontal viewwas investigated. 50 healthy subjects (25 males, 25 females) and 30 TMD patients (10 males, 20 females) in their twenties were selected. An ocelusal plane consisting of a plane A which was in contact with the mandibular central incisor and bilateral second molars was established intra-orally. Then another plane B that was in contact with plane A was attached to the mandibular teeth with a clutch. And by removing plane A, plane B was parallel to the occlusal plane even under centric occlusion was set outside the oral cavity. The Frankfult plane was set with a U shaped plane that was attached to the head. Next 3 LEDs were each attached to the plane B and the U shaped plane. Using the 3 dimensional measuring system the positional coordinates of each LED were measured and the inclination of the occlusal plane in relation to the Frankfult plane as seen from the frontal view was calculated. The inclination of the occlusal plane for the healthy subjects was in the range between 0.17 to 2.87 degrees. On the other hand the inclination of the occlusal plane for TMD patients was in the range between 0.73 to 8.08 degrees. Only 10 patients had values less than 3.00 degrees and the remaining 20 had values larger than 3.00 degrees. Also the occlusal plane inclination was 1.42 0.75 degrees for healthy subjects and 3.64 1.78 degrees for TMD patients and a statistically significant difference was found between the two groups(p<0.01, s.). From these results it was concluded that there was a possibility that the inclination of occlusal plane as seen from the frontal view was partially related to TMD.
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