Experimental noxious stimulation of the right masseter muscle does not affect bilateral masseter and temporalis muscle activity and force parameters during standardised isometric biting tasks

Sandoval, Isbel; Ferreira, Polyana Moura; Obregon, Fabian; Whittle, Terry; Murray, Greg M.

doi:10.1111/joor.12699

Cited by 3 publications

(5 citation statements)

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“…Many previous studies of isometric biting and clenching activities indicate that the vertical force task of the present study will involve activity in the bilateral masseter, medial pterygoid and temporalis muscles . The medial pterygoid muscle forms a muscle sling with the masseter muscle and these, with the temporalis, are ideally suited to being the principal agonist muscles or prime movers that generate the closing forces involved in the vertical tasks .…”

Section: Discussionmentioning

confidence: 96%

“…Moreover, participants who have had a computer tomography (CT) scan in the last 12 months were excluded as well as individuals where it was anticipated that CT scans may be required. Many of the procedures have been described previously in detail …”

Section: Methodsmentioning

confidence: 99%

“…One force transducer (LMA‐A; Kyowa Dengyo) which measured the vertical or closing force in the vertical biting tasks was secured intraorally and was placed horizontally in the palatal region of the upper splint (Figure ). A hinged plate overlaid the pressure sensor of the force transducer and on the lower side of the plate was a small metal ball that contacted another metal plate that was attached to the anterior lingual side of the lower splint and parallel to the occlusal plane . During the vertical biting tasks, the closing force was transmitted from the lower metal plate through the metal ball and hinged plate to the force transducer in the upper splint.…”

Section: Methodsmentioning

confidence: 99%

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Single motor units from the medial pterygoid muscle can be active during isometric horizontal and vertical forces

Mojaver

Tawadros

Ferreira

et al. 2019

J of Oral Rehabilitation

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Objectives To determine (a) whether the medial pterygoid muscle is active in an isometric vertical force task and in isometric horizontal force tasks in the contralateral, protrusion and ipsilateral directions; (b) whether the same single motor units (SMUs) could be active across different directions of isometric force generation; and (c) whether different regions of the medial pterygoid muscle exhibit different patterns of SMU activation during the generation of any one direction of isometric force. Methods Intramuscular electromyographic (EMG) recordings were made from the right medial pterygoid muscle in 15 healthy participants during isometric force tasks: vertical and horizontal contralateral, protrusion and ipsilateral. A computed tomography scan divided the EMG recording site into a medial or lateral part in each participant. Single motor units were discriminated in each task. Results Medial pterygoid SMU activity was recorded in 100% of participants for the vertical biting tasks, 86% of participants for the horizontal contralateral and horizontal protrusion tasks and 57% of the horizontal ipsilateral tasks. Of the 72 SMUs that were discriminated, 36% were active in all tasks; 18% were active only in the vertical tasks and 17% were active in the vertical, horizontal contralateral and horizontal protrusion tasks. The proportion of SMUs that was active in at least 1 horizontal task in the lateral part (33/39) was significantly higher than the proportion (21/33) in the medial part (Chi‐Square, P < 0.05). Conclusion The data are consistent with a stabilisation role for the medial pterygoid muscle in isometric jaw forces in the vertical and horizontal planes.

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Section: Discussionmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Single motor units from the medial pterygoid muscle can be active during isometric horizontal and vertical forces

Mojaver

Tawadros

Ferreira

et al. 2019

J of Oral Rehabilitation

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“…The non-significant decrease of the MVBF in the 60min trial might be explained by an activity compensation in other non-affected muscle parts or muscles [43][44][45][46][47][48][49] or a modification in sensory input from muscle receptors that were affected by the increased intercuspal distance that led to stretching the fibers in the jaw-closing muscles [50]. Since our study included assessing bite forces, a transducer had to be placed in-between the teeth.…”

Section: Discussionmentioning

confidence: 99%

Experimental pain and fatigue induced by excessive chewing

et al. 2020

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Background: The study was aiming to optimize excessive gum chewing as an experimental model to induce jaw muscle pain and fatigue similar to those in painful TMDs with durations that would allow immediate investigations of jaw-motor function. Further, if any sex differences would be detected in the expression of pain. Methods: This randomized, double blinded study included 31 healthy participants of both sexes. A standardized chewing protocol of either 40-or 60-min of chewing was used with a wash-out period of 1 week. Subjective fatigue, pain characteristics and functional measures were assessed. For statistical analyses, Wilcoxon Signed Rank test, Mann-Whitney Rank Sum test and Friedman's ANOVA with Tukey post-hoc test were used. Results: High subjective fatigue scores that lasted up to 20 min after the end of the trial were significantly induced both in the 40-and 60-min chewing trials (P < 0.001*). Significant but mild pain was induced only in the 60-min trial (P = 0.004*) and only in men (P = 0.04*). Also, the induced pain area was significantly bigger in the 60-min trial (P = 0.009*). However, this increase in pain and pain area did not last to the first 10-min follow-up. There were no significant differences neither between the 40-and 60-min chewing trials, except regarding the pain area (P = 0.008*), nor between the sexes. Conclusion: Taken together, excessive chewing in its current form does not seem to be a proper pain experimental model. The model needs further adjustments in order to mimic TMD-pain especially in women and to prolong the pain duration.

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“…The non-signi cant decrease of the MVBF in the 60-minute trial might be explained by an activity compensation in other non-affected muscle parts or muscles (43)(44)(45)(46)(47)(48)(49) or a modi cation in sensory input from muscle receptors that were affected by the increased intercuspal distance that led to stretching the bers in the jaw-closing muscles (50). Since our study included assessing bite forces, a transducer had to be placed in-between the teeth.…”

Section: Discussionmentioning

confidence: 99%

Experimental Pain and Fatigue Induced by Excessive Chewing

Sayegh

Vasilatou

Kumar

et al. 2020

Preprint

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Abstract Background: The study was aiming to optimize excessive gum chewing as an experimental model to induce jaw muscle pain and fatigue similar to those in painful TMDs with durations that would allow immediate investigations of jaw-motor function. Further, if any sex differences would be detected in the expression of pain. Methods: This randomized, double blinded study included 31 healthy participants of both sexes. A standardized chewing protocol of either 40- or 60-minutes of chewing was used with a wash-out period of one week. Subjective fatigue, pain characteristics and functional measures were assessed. For statistical analyses, Wilcoxon Signed Rank test, Mann–Whitney Rank Sum test and Friedman’s ANOVA with Tukey post-hoc test were used. Results: High subjective fatigue scores that lasted up to 20 minutes after the end of the trial were significantly induced both in the 40- and 60-minute chewing trials (P<0.001*). Significant but mild pain was induced only in the 60-minute trial (P=0.004*) and only in men (P=0.04*). Also, the induced pain area was significantly bigger in the 60-minute trial (P=0.009*). However, this increase in pain and pain area did not last to the first 10-minute follow-up. There were no significant differences neither between the 40- and 60-minute chewing trials, except regarding the pain area (P=0.008*), nor between the sexes. Conclusion: Taken together, excessive chewing in its current form does not seem to be a proper pain experimental model. The model needs further adjustments in order to mimic TMD-pain especially in women and to prolong the pain duration.

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Experimental noxious stimulation of the right masseter muscle does not affect bilateral masseter and temporalis muscle activity and force parameters during standardised isometric biting tasks

Abstract: The findings suggest that experimentally induced right masseter muscle pain does not modify force or surface jaw muscle EMG activity during isometric biting tasks.

Cited by 3 publications

References 43 publications

Single motor units from the medial pterygoid muscle can be active during isometric horizontal and vertical forces

Single motor units from the medial pterygoid muscle can be active during isometric horizontal and vertical forces

Experimental pain and fatigue induced by excessive chewing

Experimental Pain and Fatigue Induced by Excessive Chewing

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