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Clinical Oral Investigations

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01-05-2017 | Original Article

Symmetry of fMRI activation in the primary sensorimotor cortex during unilateral chewing

Authors: M. Lotze, M. Domin, B. Kordass

Published in: Clinical Oral Investigations | Issue 4/2017

Abstract

Objective

Functional magnetic resonance imaging (fMRI) is one of the most advanced techniques to analyze the cerebral effects on many behavior aspects of the oral system such as chewing and mastication. Studies on imaging of the cerebral representation of chewing demonstrated differential results with respect to cortical lateralization during unilateral chewing. The aim of our study is to clarify the effects of cerebral responses during unilateral chewing.

Material and methods

We used fMRI to compare brain activities during occlusal function in centric occlusion on natural teeth and chewing on a gum located on the right or the left teeth in 15 healthy subjects. Group data were performed by Talairach normalization and in addition by an assignment of activation maxima to individual anatomical landmarks in order to avoid possible loss of spatial preciseness of activation sites by normalization procedures.

Results

Evaluation of group data by Talairach normalization revealed representation sites for occlusal movements in bilateral primary (S1) and secondary (S2) somatosensory cortices, primary motor (M1) and premotor cortices, supplementary motor area (SMA) and medial cingulate gyrus, bilateral anterior cerebellar hemispheres and vermis, insula, orbitofrontal cortex, thalamus, and left pallidum. Right-sided chewing showed no differential activation to left-sided chewing, and both showed activation in areas also involved in bilateral occlusion. Both techniques, the one based on group normalization and the one based on an individual evaluation method, revealed remarkable low differences in activation maximum location in the primary motor, the primary and secondary somatosensory cortices, and the anterior cerebellar lobe. All chewing movements tested involved bilateral sensorimotor activation without a significant lateralization of activation intensities.

Conclusion

Overall, a general lateralization of occlusion movements to the dominant side could not be verified in the present study. Chewing on the left or on the right side of teeth makes no difference for brain representation of chewing.

Clinical relevance

The results describe the basic effects of what we can expect by evaluation of cerebral effects of chewing and mastication. Based on these results, clinical fMRI studies can be performed in different patient groups.

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Title: Symmetry of fMRI activation in the primary sensorimotor cortex during unilateral chewing
Authors: M. Lotze
M. Domin
B. Kordass
Publication date: 01-05-2017
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 4/2017
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-016-1858-4

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Symmetry of fMRI activation in the primary sensorimotor cortex during unilateral chewing

Abstract

Objective

Material and methods

Results

Conclusion

Clinical relevance

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Objective

Material and methods

Results

Conclusion

Clinical relevance

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