The study on the effects of orthodontic tooth movement on somatosensory evoked magnetic fields in cerebral cortex

Research Project

Project/Area Number	15K11337
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Orthodontics/Pediatric dentistry
Research Institution	Tohoku University
Principal Investigator	Igarashi Kaoru 東北大学, 歯学研究科, 教授 (70202851)
Co-Investigator(Kenkyū-buntansha)	金高弘恭東北大学, 歯学研究科, 准教授 (50292222)
Co-Investigator(Renkei-kenkyūsha)	KANNO Akitake 東北大学, 医学研究科, 講師 (20578968)
Project Period (FY)	2015-04-01 – 2018-03-31
Project Status	Completed (Fiscal Year 2017)
Budget Amount *help	¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000) Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000) Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000) Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords	歯の移動 / 歯根膜刺激 / 脳磁図
Outline of Final Research Achievements	It is still not well-known about the features and mechanisms of pain caused by the orthodontic tooth movement. The purposes of this study are to characterize the pain associated with orthodontic tooth movement objectively by measuring somatosensory evoked magnetic fields. The result of the study suggested that the transmission speed of twenty-four hours after the orthodontic tooth movement was faster than that of non-orthodontic tooth movement in a part of subjects. And, the comparison of the sense between the upper and the lower first molar’s periodontal ligaments generated by the mechanical stimulation showed the transmission speed of the lower first molar was faster and its signal strength was stronger than those of the upper first molar. Thus, the sense of the lower first molar periodontal ligaments has become a more important role in oral function than that of the upper first molar.