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The Influence of Tonic Muscle Activation on Human Jaw Displacement Tremor

Department of Masticatory Function, Academic Centre for Dentistry Amsterdam, University of Amsterdam, Louwesweg 1, 1066 EA Amsterdam, The Netherlands

J.H. De Vries

Department of Masticatory Function, Academic Centre for Dentistry Amsterdam, University of Amsterdam, Louwesweg 1, 1066 EA Amsterdam, The Netherlands

Jaw displacement tremor was investigated. Both tremor amplitude and tremor frequency were found to increase with increasing muscle activation. Co-contraction of jaw elevator and jaw depressor muscles was employed in order to vary muscle activation levels without the teeth being in occlusion. Reproducibility of tremor changes was statistically significant for each individual investigated. The relationship between tremor frequency and tremor amplitude, over the range of muscle activation investigated, varied per individual. It is hypothesized that the physiological basis for this inter-individual variation is differences in the development of jaw stiffness with increasing muscle activation between subjects. This explanation may be the basis, at least in part, for the clinical presence of objective jaw stiffness in one subject and its absence in another.

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Journal of Dental Research, Vol. 67, No. 8, 1081-1085 (1988)
DOI: 10.1177/00220345880670080401


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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by McCarroll, R.S. Articles by De Vries, J.H. Search for Related Content PubMed PubMed Citation Articles by McCarroll, R.S. Articles by De Vries, J.H. Social Bookmarking                         What's this?