2005 Fiscal Year Final Research Report Summary
THE LIP SEALING FUNCTION CORRELATES WITH INCREASED FACIAL HEIGHT
| Project/Area Number |
16592053
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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 | KYUSHU DENTAL COLLEGE |
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Principal Investigator |
YAMAGUCHI Kazunori KYUSHU DENTAL COLLEGE, DENTISTRY, PROFESSOR, 歯学部, 教授 (50112214)
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| Co-Investigator(Kenkyū-buntansha) |
ICHIDA Toshimichi KYUSHU DENTAL COLLEGE, Dentistry, Assistant Professor, 歯学部, 助手 (70094761)
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| Project Period (FY) |
2004 – 2005
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| Keywords | OCCLUSAL HEIGHT / MANDIBULAR CLOCKWISE ROTATION / OPEN BITE / LIP SEALING FUNCTION / INCOMPETENT LIPS / ORTHOGNATHIC SURGICAL TREATMENT |
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| Research Abstract |
In study of the first year, the lip sealing function was investigated in individuals with increased anterior facial height by mandibular clockwise rotation. Seven-teen adult volunteers with normal incisor relationship and without severe anterior crowding were divided into 9 competent and 8 incompetent lip subjects based on EMG activities of lower lip at rest with the lips in contact and apart. The inter-incisal distance was increased with a occlusal splint, while EMG activities of the lower lip were recorded. EMG activity of the lower lip with the lips in contact highly correlated with the facial height in two groups. The lip competence in the most of the competent lip group was broken when increasing facial height over 2.0 mm. With increase of the facial height by 6.0 mm, all subjects showed lip incompetence. The results suggest that increased facial height by clockwise rotation of the mandible has significant effect on the lip sealing function in the competent lip subjects.
Based on the results, in the second year, the changes of the lip sealing function associated with chewing function were studied in patients underwent orthognathic surgical treatment. The lip incompetence was improved after orthognathic surgical treatment as well as dentofacial deformities.
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