Journal of The Japanese Stomatological Society
Online ISSN : 2185-0461
Print ISSN : 0029-0297
ISSN-L : 0029-0297
Study on regional activities in the human brain caused by the low-level clenching and tooth separation: Investigation with functional magnetic resonance imaging
Yoshiko ARIJIHisataka KONDOKen MIYAZAWAShigemitsu SAKUMAMasako TABUCHIYoshitaka KISEMiwa NAKAYAMAShuji KOYAMAAkifumi TOGARIShigemi GOTOEiichiro ARIJI
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2020 Volume 69 Issue 1 Pages 13-21

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Abstract

Purpose: The purpose of this study was to clarify the activated regions in the human brain caused by low-level clenching and tooth separation, focusing on their differences.
Methods: For creating functional magnetic resonance images(fMRI), echo planar and T1-weighted images were obtained using a 3T MRI apparatus. Six healthy volunteers clenched with 10% and 40% of the maximum bite force as vertical stimulation(Task 1), and 10 volunteers bit at 60, 120 and 180 seconds after the insertion of a brass contact gage as horizontal stimulation together with vertical stimulation(Task 2).
Results: At 10% clenching, the supplementary motor area, frontal association cortex and cerebellum were activated, whereas the primary sensorimotor cortex and temporal association cortex were added to the activated regions at 10% clenching. In addition to the activated regions in Task 1, the parietal association cortex, thalamus, hippocampus, putamen and insula were activated in the biting after the insertion of the brass gage.
Conclusion: The hypothalamic area was confirmed to be activated due to biting with the gage in addition to the regions activated in low-level clenching. Brain fMRI might provide useful information to clarify the relationship between various intra-oral stimulations and brain activities.

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© 2020 Japanese Stomatological Society
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