1. The Effect on Brain Activity of Clenching with a Bite Plate Increasing Occlusal Vertical Dimension to Mandibular Rest Position: a Functional MRI Study.
- Author
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Ishida, Reiko, lwagami, Yoshinobu, Hamachi, Takeshi, Goto, Tazuko K., Watanabe, Yoshihisa, Wada, Takeshi, Taniguchi, Yoshiyuki, Nielsen, Matthew, Takizawa, Osamu, Hamada, Yasukazu, Fujita, Shigeyuki, and Sato, Moria
- Subjects
MAGNETIC resonance imaging of the brain ,BRUXISM ,ORTHODONTIC appliances, Removable ,DENTAL occlusion ,TEMPOROMANDIBULAR joint ,MOTOR ability ,STOMATOGNATHIC system - Abstract
In this study, we examined brain activity using functional magnetic resonance imaging (fMRI) during clenching with or without a bite plate increasing occlusal vertical dimension to mandibular rest position, and identified the effect on brain activity of clenching with a bite plate. Subjects comprised five healthy men aged 20 to 40 years with normal occlusion and no artifacts on preliminary imaging. fMRI time-series were acquired with and without the plate inserted. During each series, the subjects alternately performed persistent teeth clenching (occlusal force at 25%-35% of maximum voluntary clenching) for 22 sec and non-clenching for 22 sec for a total of 458 sec. The results were as follows. 1) During clenching in the intercuspal position, brain activity was shown in the bilateral primary somatosensory area. 2) When the bite plate was inserted to change the occlusal vertical dimension to the mandibular rest position, brain activity was shown in the bilateral primary motor area during clenching (compared with non-clenching). These findings suggest that clenching with a plate increasing vertical dimension to mandibular rest position activates the primary motor area. [ABSTRACT FROM AUTHOR]
- Published
- 2010