2009 Fiscal Year Final Research Report
Influences of sex hormones in TMJ dysfunctions
| Project/Area Number |
20791577
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Orthodontic/Pediatric dentistry
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| Research Institution | Hiroshima University |
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Principal Investigator |
FUJITA Tadashi Hiroshima University, 大学院・医歯薬学総合研究科, 助教 (90335662)
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| Project Period (FY) |
2008 – 2009
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| Keywords | 歯科矯正学 |
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| Research Abstract |
Previous clinical studies indicate that the overeruption of unopposed teeth may be different between young and adult individuals. The aim of this study was to investigate the position of the unopposed molar, in young and adult rats. In young (4-week old) and adult (26-week old) rats, the right maxillary molar crowns were reduced occlusally by grinding. After 4 weeks, the animals were sacrificed and scanned by micro-CT. The unopposed molars of the young animals were in supraposition being on average 262 μm (±135 μm) higher than the position of molars with antagonists. This was more pronounced than in adults (average 125 μm ±108 μm, P < 0.01). In the young animals the alveolar bone level was higher in the unopposed molars with supraposition while no differences were found in the adults' molars. Our results demonstrated that the overeruption potential of unopposed molars is higher in young than adult rats.
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[Presentation] Localization of sex hormones recepters during growth in newborn mice2008
Author(s)
Marquez Hernandez R, Ohtani J, Fujita T, Kawata T, Kaku M, Tohma Y, Motokawa M, Tsuka N, Sunagawa H, Koseki H, Tanne K
Organizer
2nd Joint Meeting of the Korean Association of Orthodontists and the Japanese Orthodontic Society
Place of Presentation
Seoul, South Korea
Year and Date
20080000
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