2014 Fiscal Year Final Research Report
Studies on Circadian Rhythms of Intraoral pH and Mature of Young Permanent Tooth
| Project/Area Number |
24593109
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Orthodontic/Pediatric dentistry
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| Research Institution | Meikai University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Koji 明海大学, 歯学部形態機能成育学講座 口腔小児科学分野, 講師 (30570650)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | 唾液pH / 日内変動 / 幼若永久歯 / エナメル質 / μCT / ミネラル / 成熟 / 石灰化 |
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| Outline of Final Research Achievements |
1) The saliva pH monitoring from 9：00 a.m. to 5：00 p.m. showed above pH 5.5 on both UAL (labial surface of upper central incisor ) and UPB ( buccal surface of upper first molar ) . Minimum pH was about 5.5 and maximum pH was about 7.5 on both. UAL showed higher value than UPB from 9：00 a.m. to 0:00 p.m. and UPB showed higher value than UAL from 1：00 p.m. to 5:00 p.m. On the other hand, while sleeping, from 0:00 a.m. to 7:00 a.m., UAL showed higher value than UPB. We presume that UAL is affected by its contact with labial mucosa, in other words, saliva from minor salivary gland while sleeping.
2) Compared two Hounsfield unit values（HUV）, measured values of μCT of enamel, of extracted erupted and impacted supernumerary tooth, the impacted tooth tended to show higher value than erupted supernumerary tooth in the same depth.We obtained a result that challenges conventional theory that, after tooth erupts, enamel matures and bone mineral density gets higher.
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| Free Research Field |
小児歯科学、 障碍者歯科学
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