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Study on regional activities in the human brain caused by low‐level clenching and tooth separation: Investigation with functional magnetic resonance imaging
Author(s) -
Ariji Yoshiko,
Kondo Hisataka,
Miyazawa Ken,
Sakuma Shigemitsu,
Tabuchi Masako,
Kise Yoshitaka,
Nakayama Miwa,
Koyama Shuji,
Togari Akifumi,
Goto Shigemi,
Ariji Eiichiro
Publication year - 2019
Publication title -
oral science international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.256
H-Index - 13
eISSN - 1881-4204
pISSN - 1348-8643
DOI - 10.1002/osi2.1020
Subject(s) - functional magnetic resonance imaging , putamen , magnetic resonance imaging , stimulation , medicine , thalamus , brain activity and meditation , cortex (anatomy) , cerebellum , psychology , neuroscience , electroencephalography , radiology
Purpose The purpose of this study was to clarify the activated regions in the human brain caused by low‐level clenching and tooth separation, with emphasis on their differences. Methods For functional magnetic resonance imaging ( 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 s after the insertion of a brass contact gage as horizontal stimulation together with vertical stimulation (Task 2) were included in this study. 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 40% clenching. In addition to the activated regions in Task 1, the parietal association cortex, thalamus, hippocampus, putamen, and islet were also activated during 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 intraoral stimulations and brain activities.