scholarly journals Effect of triiodothyronine on the maxilla and masseter muscles of the rat stomatognathic system

2011 ◽  
Vol 44 (7) ◽  
pp. 694-699
Author(s):  
M.V. Mariúba ◽  
F. Goulart-Silva ◽  
S. Bordin ◽  
M.T. Nunes
Keyword(s):  
Stomatognathic System ◽  
Masseter Muscles

scholarly journals Histological, Histochemical, and Protein Changes after Induced Malocclusion by Occlusion Alteration of Wistar Rats

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Carolina de Souza Guerra ◽  
Yamba Carla Lara Pereira ◽  
João Paulo Mardegan Issa ◽  
Kelly Galisteu Luiz ◽  
Elaine A. Del Bel Guimarães ◽  
...  
Keyword(s):  
Masseter Muscle ◽  
Wistar Rats ◽  
Morphological Analysis ◽  
Contralateral Side ◽  
Environmental Interventions ◽  
Stomatognathic System ◽  
Masseter Muscles ◽  
Experimental Group ◽  
Muscle Remodeling

Although disorders of the stomatognathic system are common, the mechanisms involved are unknown. Our objective was to study the changes in the masseter muscles after unilateral exodontia. Molar extraction was performed on Wistar rats (left side), and the animals were sacrificed after either 14 or 26 days. The masseter muscle was processed for histological analysis, conventional andin situzymography, and immunohistochemistry. The morphological analysis showed unique and specific characteristics for the experimental group. By conventional zymography no significant values of 72 kDa MMP-2 (P< 0.05) were found in both of the sides of masseter muscle after 14 and 26 days of unilateral extraction. Thein situzymography showed gelatinolytic activity on all deep masseter muscles, with significant increase on the contralateral side after 14 and 26 days (P< 0.05). The immunohistochemistry demonstrated greater expression of MMP-2 than MMP-9 and MMP-14 in all masseter muscles and there were few differences in the staining of 4 TIMPs. This knowledge about morphology and molecular masticatory muscle remodeling following environmental interventions can be used to develop clinically successful treatments.

scholarly journals The Effects of Wearing a Medical Mask on the Masticatory and Neck Muscle Activity in Healthy Young Women

2022 ◽  
Vol 11 (2) ◽  
pp. 303
Author(s):  
Michał Ginszt ◽  
Grzegorz Zieliński ◽  
Jacek Szkutnik ◽  
Marcin Wójcicki ◽  
Michał Baszczowski ◽  
...  
Keyword(s):  
Young Women ◽  
Muscle Activity ◽  
Middle Part ◽  
Sternocleidomastoid Muscle ◽  
Bioelectrical Activity ◽  
Neck Muscle ◽  
Digastric Muscle ◽  
Significance Level ◽  
Stomatognathic System ◽  
Masseter Muscles

The objective of this study was to analyze the influence of wearing a medical mask on masticatory and neck muscle activity in healthy young women. We recruited 66 healthy women aged from 18 to 30 years (mean 23.6 ± 2.3 years). The temporalis anterior (TA), the superficial part of the masseter muscle (MM), the anterior bellies of the digastric muscle (DA), and the middle part of the sternocleidomastoid muscle (SCM) potentials were recorded at rest and during functional activity using an eight-channel device for surface electromyography—BioEMG IIITM. There was a statistically significant decrease in mean TA activity during medical mask measurement compared to no mask examination at rest (2.16 µV vs. 2.58 µV; p = 0.05; ES = 0.2). Significant decreases in resting RMS values were also observed during the medical mask phase in comparison to no mask examination concerning the left MM (1.75 µV vs. 2.17 µV; p = 0.01; ES = 0.3), and mean bioelectrical activity of the MM (1.81 µV vs. 2.15 µV; p = 0.02; ES = 0.2). The differences between the two conditions did not reach the assumed significance level (p > 0.05) in terms of other indices. Wearing a medical mask has a small effect on decreasing the resting potentials of the temporalis anterior and masseter muscles without changing the parameters of activity and asymmetry within the stomatognathic system.

scholarly journals Initial fatigue of masseter muscles during the maximal voluntary teeth contraction

2002 ◽  
Vol 59 (1) ◽  
pp. 43-48
Author(s):  
Zivorad Miljkovic ◽  
Milan Zeljkovic ◽  
Milos Anojcic
Keyword(s):  
Action Potentials ◽  
Masticatory Muscles ◽  
Peripheral Fatigue ◽  
Striated Muscles ◽  
Diagnostic Significance ◽  
Skeletal Class ◽  
Stomatognathic System ◽  
Masticatory System ◽  
Faster Development ◽  
Masseter Muscles

Fatigue of striated muscles is defined as the impossibility to generate the expected or required force during the repeated contraction. During the maximal voluntary teeth contraction in the position of central occlusion the initial fatigue in masticatory muscles during the isometric contraction occurs. If a person can clench its teeth continuously and voluntarily it has a diagnostic significance since the peripheral fatigue is that important factor in the masticatory muscles activity, which is in direct correlation with the function of the masticatory system. The aim was to compare the obtained results of the initial fatigue of masseter muscles during the maximal voluntary teeth contraction in subjects with naturally healthy intact dentition and subjects with a pair of new full dentures. The investigation comprised 20 subjects with healthy stomatognathic system of the skeletal class I by Angle. Comparison of the values of the obtained results was performed electromyographically by synchronous registration of action potentials of masseter muscles. Results of the investigation of the onset of initial fatigue of masseter muscles in the subjects with natural healthy intact dentitions showed lower values, i.e., faster development of the muscular fatigue (31.5 s) compared to the subjects with a pair of new full dentures (44.5 s).

Effects of relapsing-remitting multiple sclerosis on the stomatognathic system: preliminary findings

2020 ◽  
Vol 179 (6) ◽  
Author(s):  
Gabriel Pádua da Silva ◽  
Marcelo Palinkas ◽  
Robson F. Tosta Lopes ◽  
Saulo C. Vallin Fabrin ◽  
Bruno Ferreira ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Stomatognathic System ◽  
Relapsing Remitting ◽  
Remitting Multiple Sclerosis ◽  
Relapsing Remitting Multiple Sclerosis

The functional architecture of the stomatognathic system and orofacial aesthetic repositioning during the aging process

2020 ◽  
Vol 5 (1) ◽  
pp. 4-16
Author(s):  
Marcus Vinícius Manhães Ribeiro do Nascimento ◽  
Caroline Grijó e Silva ◽  
João Victor França Moura ◽  
Bruno dos Santos Fausto ◽  
Andrea Damas Tedesco
Keyword(s):  
Aging Process ◽  
Functional Architecture ◽  
Stomatognathic System
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