| Project/Area Number |
11672056
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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 |
矯正・小児・社会系歯学
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| Research Institution | Ohu university |
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Principal Investigator |
ITABASHI Jin Ohu Univ., School of Dentistry, Assintant prof., 歯学部, 講師 (00193417)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUI Kazunori Ohu Univ., School of Dentistry, Assinatant prof., 歯学部, 講師 (30199179)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | skeletal reversed occlusion / intercuspal position / reference position / relative condylar inclination / relative anterior guidance / occlusal plane angle / chewing cycle / チョッピングタイプ / グラインディングタイプ |
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| Research Abstract |
The purpose of this study was to investigate an occlusal stability and function after surgical orthodontic treatment in skeletal reversed occlusion. The subjects selected for this study were 9 Japanese adult females, from 1 year 1 month to 7 year 9 months after ortho-gnathic surgery. The data on mandibular movement consisted of 8 patients because of a mechanical failure about 1 patient.
The materials of this study consisted of cast models set on SAM III articulator with true hinge axis -orbital plane, and the data on Axiograph and Gnathohexagraph : GHG that was a mandibular movements analyzing machine. Mandibular movement and chewing cycle were taken with GHG.The cast models were analyzed with Mandibular positioning indicator : MPI that was evaluated three-dimensional condylar movement at ICP-RP.
The results were as follows :
There were three patients over the lateral discrepancy at ICP-RP.A half of patients had unbalanced occlusal plane in right and left. Almost patients showed mandibular displacement during maximal opening. Three patients showed the grinding type in chewing cycle except for 5 patients who showed chopping type. Many of patients had narrow and disjointed stroke at chewing cycle.
We must observe the patients treated with ortho-gnathic surgery in lomg term period.
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