| Project/Area Number |
08457573
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Nagasaki University |
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Principal Investigator |
KOBAYASHI Kazuhide Nagasaki University, Department of Orthodontics, Professor, 歯学部, 教授 (90049370)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIDA Noriaki Nagasaki University, Department of Orthodontics, Research Associate, 歯学部附属病院, 助手 (40230750)
KITAURA Hideki Nagasaki University, Department of Orthodontics, Research Associate, 歯学部附属病院, 助手 (60295087)
IGUCHI Syuichirou Nagasaki University, Department of Orthodontics, Assistant Professor, 歯学部附属病院, 講師 (70145267)
小林 泰浩 長崎大学, 歯学部・附属病院, 助手 (20264252)
佛坂 斉祉 長崎大学, 歯学部, 助手 (90199513)
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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 |
¥6,900,000 (Direct Cost: ¥6,900,000)
Fiscal Year 1998: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1997: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | root resorption / monitoring / mobility / cephalometry / orthodontics / 抗歯根抗体 |
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| Research Abstract |
Root resorption is one of the most common iatrogenic sequelae of orthodontic treatment. Recently, root contact with the labial or palatal cortical plate at root apex level during orthodontic tooth movement was reported to be related to root resorption, and dentofacial morphology was suggested to predispose certain persons to root contact with the corticaiplate. In this study, we constructed a best-fit straight line for the maxillary palatal cortical plate and set a line for the labial cortical plate from A point to Prosthion point in order to obtain measurements of proximity of root apices with the cortical plates of the maxillary alveolus. We investigated the correlation between apical root resorption and the measured variables. Our findings suggest that root approximation to the palatal cortical plate during orthodontic treatment could explain approximately 12% of the variance observed in the level of root resorption and the maxillary alveolar bone width about 2%. Tooth extrusion and crown lingualization also contributed to root resorption. We concluded that maxillary central incisor apical root resorption is influenced by root approximation to the palatal cortical plate during orthodontic treatment. Furthermore, there is an intimate relationship between tooth mobility and root resorption. There is a tendency that tooth with large mobility has a high level root resorption. However, we could not detect the protein of root or cytokine to induce bone resorption by ELISA- during orthodontic treatment. The evaluation of the risk of root resorption from lateral cephalometric head film during orthodontic treatment was useful for prevention of root resorption.
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