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Small vertical changes in jaw relation affect motor unit recruitment in the masseter

Strategies for recruitment of masseter muscle motor units (MUs), provoked by constant bite force, for different vertical jaw relations have not previously been investigated. The objective of this study was to analyse the effect of small changes in vertical jaw relation on MU recruitment behaviour in...

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Main Authors: Terebesi, Sophia (Author) , Giannakopoulos, Nikolaos Nikitas (Author) , Brüstle, Fabian (Author) , Hellmann, Daniel (Author) , Türp, Jens Christoph (Author) , Schindler, Hans J. (Author)
Format: Article (Journal)
Language:English
Published: [2016]
In: Journal of oral rehabilitation
Year: 2015, Volume: 43, Issue: 4, Pages: 259-268
ISSN:1365-2842
DOI:10.1111/joor.12375
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1111/joor.12375
Verlag, lizenzpflichtig, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1111/joor.12375
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Author Notes:S. Terebesi, N.N. Giannakopoulos, F. Brüstle, D. Hellmann, J.C. Türp & H.J. Schindler

MARC

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520 |a Strategies for recruitment of masseter muscle motor units (MUs), provoked by constant bite force, for different vertical jaw relations have not previously been investigated. The objective of this study was to analyse the effect of small changes in vertical jaw relation on MU recruitment behaviour in different regions of the masseter during feedback-controlled submaximum biting tasks. Twenty healthy subjects (mean age: 24·6 ± 2·4 years) were involved in the investigation. Intra-muscular electromyographic (EMG) activity of the right masseter was recorded in different regions of the muscle. MUs were identified by the use of decomposition software, and root-mean-square (RMS) values were calculated for each experimental condition. Six hundred and eleven decomposed MUs with significantly (P < 0·001) different jaw relation-specific recruitment behaviour were organised into localised MU task groups. MUs with different task specificity in seven examined tasks were observed. The RMS EMG values obtained from the different recording sites were also significantly (P < 0·01) different between tasks. Overall MU recruitment was significantly (P < 0·05) greater in the deep masseter than in the superficial muscle. The number of recruited MUs and the RMS EMG values decreased significantly (P < 0·01) with increasing jaw separation. This investigation revealed differential MU recruitment behaviour in discrete subvolumes of the masseter in response to small changes in vertical jaw relations. These fine-motor skills might be responsible for its excellent functional adaptability and might also explain the successful management of temporomandibular disorder patients by somatic intervention, in particular by the use of oral splints. 
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