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1.
Arch Oral Biol ; 122: 104985, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-33340921

RESUMO

OBJECTIVE: To detect the long-term response to unilateral anterior crossbite (UAC) in masticatory muscles and in molecular biomarkers of peripheral blood leukocytes. DESIGN: Fifty-six six-week-old Sprague-Dawley rats were used. The gene-fold changes in peripheral blood leukocytes were detected by the microarray analysis to compare the rats that received 20-week UAC treatment with age-matched controls (n = 4). Muscle atrophy-related gene Fbxo32 was selected based on the data of the microarray analysis verified by using real-time PCR. The remaining 36 rats were randomly separated in the UAC and control groups at 12 and 20 weeks (n = 12). The protein expression of Fbxo32 and the muscle injury and myogenesis-related markers, αB-crystallin and desmin, were detected in the masseter and lateral pterygoid muscles by western blot assay. RESULTS: In the 20-week UAC group, the masseter muscle weight was lower than that in the age-matched control group, and the expression level of Fbxo32 gene in peripheral blood leukocytes was increased according to the microarray analysis confirmed by real-time PCR detection. The increased protein expression levels of Fbxo32 were detected in the masseter in the 20-week UAC group, and the protein expression levels of desmin and αB-crystallin were decreased at this time point. No similar changes were detected in the lateral pterygoid muscle. CONCLUSIONS: Masseter atrophy is induced by long-term stimulation of UAC. The increased expression of the Fbxo32 gene in peripheral blood leukocytes may be a candidate biological marker of masseter atrophy.


Assuntos
Má Oclusão/fisiopatologia , Músculo Masseter/fisiopatologia , Animais , Leucócitos Mononucleares , Proteínas Musculares/metabolismo , Músculos Pterigoides , Ratos , Ratos Sprague-Dawley , Proteínas Ligases SKP Culina F-Box/metabolismo
2.
Clin Ter ; 171(5): e414-e420, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32901785

RESUMO

OBJECTIVE: Surface Electromyography of masticatory muscles (sEMG) is used as a tool to support diagnosis and treatment of Temporomandibular disorders (TMDs). The study aimed at examining jaw muscles pattern in individuals with temporomandibular joint disc displacement with reduction (TMJ/DDR). This sort of subjects was supposed to have a different muscular pattern compared to the control group. MATERIALS AND METHODS: Sixty-four women with unilateral TMJ/DDR and forty TMD-free women underwent a sEMG assessment of masticatory muscles. Descriptive statistics were performed. Student T-Test assessed differences between the two groups. Statistical significance was set at ρ < 0.05. RESULT: The t-test showed statistically significant results only in BAR and SMI scores (ρ value < 0,0001). The other measurements did not differ between the two groups. BAR index values of all healthy subjects were within the reference range. Almost the entire TMJ/DDR group had BAR index out of reference range and anteriorly placed. CONCLUSION: Women with TMJ/DDR showed an altered recruitment of the jaw muscles, with significant difference between the activity of the couple of temporalis and the one of masseters, compared to the control group. A lower chewing efficiency was found in the DDR group compared to the control one.


Assuntos
Eletromiografia , Disco da Articulação Temporomandibular/fisiopatologia , Transtornos da Articulação Temporomandibular/fisiopatologia , Adulto , Eletromiografia/métodos , Feminino , Humanos , Músculo Masseter/fisiopatologia , Mastigação , Músculos da Mastigação/fisiopatologia , Pessoa de Meia-Idade , Músculo Temporal/fisiopatologia , Transtornos da Articulação Temporomandibular/diagnóstico
3.
Sci Rep ; 10(1): 7477, 2020 05 04.
Artigo em Inglês | MEDLINE | ID: mdl-32366926

RESUMO

The aim of the present study was to evaluate intra-day (test) and inter-day (re-test) reliability of surface electromyography (sEMG) signals of the masseter and temporal muscles in patients with Down syndrome (DS). We determined the reliability of sEMG variables in 33 patients with DS. EMG signals were recorded at rest as well as during maximum voluntary clenching and maximum habitual intercuspation (MHI). The signals were analyzed considering the amplitude in the root mean square (RMS), mean frequency (MNF), median frequency (MDF) and approximate entropy (ApEn). The intraclass correlation (ICC2,1) for the three trials recorded during MHI in the two sessions (test and retest) revealed excellent intra-session and inter-session reliability (ICC2,1 = 0.76 to 0.97) for all sEMG variables and muscles. In the rest position, excellent reliability was found for RMS and ApEn (ICC2,1 = 0.75 to 1.00) and good to excellent reliability was found for MDF and MNF (ICC2,1 = 0.64 to 0.93). The intra-session (test) and inter-session (re-test) analyses demonstrated the reliability of nonlinear sEMG variables of the masticatory muscles in adults with Down Syndrome.


Assuntos
Síndrome de Down/fisiopatologia , Eletromiografia , Músculo Masseter/fisiopatologia , Contração Muscular , Músculo Temporal/fisiopatologia , Adolescente , Adulto , Feminino , Humanos , Masculino
4.
Chest ; 157(3): e59-e62, 2020 03.
Artigo em Inglês | MEDLINE | ID: mdl-32145817

RESUMO

Bruxism is a heterogeneous condition related to various underlying mechanisms, including the presence of OSA. This case report illustrates that sleep mandibular movement monitoring and analysis could provide a useful opportunity for detection of both sleep bruxism and respiratory effort. The current case suggests that tracking of respiratory effort could enable evaluation of bruxism and its potential interactions. Successful treatment of sleep-related respiratory effort may lead to improved or resolution of bruxism in cases where such a causal relationship does exist.


Assuntos
Pressão Positiva Contínua nas Vias Aéreas , Apneia Obstrutiva do Sono/diagnóstico , Apneia Obstrutiva do Sono/terapia , Bruxismo do Sono/diagnóstico , Eletromiografia , Feminino , Humanos , Músculo Masseter/fisiopatologia , Pessoa de Meia-Idade , Polissonografia , Apneia Obstrutiva do Sono/complicações , Bruxismo do Sono/complicações , Bruxismo do Sono/fisiopatologia
6.
Arch Oral Biol ; 109: 104588, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31669922

RESUMO

OBJECTIVE: Dental occlusion are frequently changed in clinic. Molecular responses in jaw muscles to aberrant dental occlusion are changes are attractive, yet remain are obscure. DESIGN: Unilateral anterior crossbite (UAC) prostheses were applied to Sprague-Dawley rats and then ceased after two weeks to detect the reactions of the masseter, a representative jaw elevator, and the lateral pterygoid muscle (LPM), a representative jaw depressor. RESULTS: Two weeks of UAC elicited mild injury of the two muscles. Myogenesis and protective reactions were detected as increases in αB-crystallin expression in the masseter after 3 days and in the LPM after 2 weeks, and increases in desmin expression in both muscles after 2 weeks. A switch in fibre types from IIb to IIx occurred in the LPM but not in the masseter. Inflammatory responses, shown by the infiltration of inflammatory cells and increases in TNF-α mRNA expression, and fibrosis responses, shown by increased mRNA expression of Type I and III collagens, appeared very mild in the two muscles. These responses were partially recovered by the cessation of UAC. During the whole process, no obvious changes were observed in mitochondrial function, as indicated by the levels of proliferator-activated receptor γ coactivator 1α, mitofusin-2 and voltage-dependent anion channel. CONCLUSIONS: UAC causes injury and very limited inflammatory and fibrosis adaption in the masseter and LPM. Both muscles respond with myogenesis and protective activity. The LPM responds also with muscle fibre isoform alternations. These alterations were partially recovered by the cessation of dental stimulation at an early stage.


Assuntos
Implantes Dentários/efeitos adversos , Má Oclusão , Músculo Masseter/fisiopatologia , Músculos Pterigoides/fisiopatologia , Animais , Fibrose , Inflamação , Arcada Osseodentária , Músculo Masseter/lesões , Fibras Musculares Esqueléticas , Músculos Pterigoides/lesões , Ratos , Ratos Sprague-Dawley
7.
Codas ; 31(6): e20180207, 2019.
Artigo em Português, Inglês | MEDLINE | ID: mdl-31800879

RESUMO

PURPOSE: characterize the swallowing muscles electromyographic activity in EM. METHODS: we evaluated 60 individuals being 30 with definitive diagnosis in EMG and 30 without neurologic changes. Volunteers provided personal data through interview, and we also obtained data from clinical records on the time of diagnosis, disease clinic form and the EDSS scale score. We then administered the DYMUS questionnaire. All evaluations occurred according to the Swallowing Electromyographic Evaluation Protocol. RESULTS: Saliva swallowing, liquid swallowing with comfortable volume and continuous swallowing showed differences in the groups at the masseter, with higher averages in the comparison group. We verified differences between masseter and supra hyoid in each group, at rest, in saliva swallowing, liquid swallowing with comfortable volume and continued swallowing. In all situations the averages were higher in the supra hyoid, being that the smaller difference occurred at rest and the higher at continuous swallow. We recorded correlations between EDSS and the activity of supra hyoid at saliva swallow, liquid swallow with comfortable volume and swallow continuous. With the DYMUS, we observed correlations with the masseter activity and with the swallowing time. The high punctuation at the DYMUS presented correlations with the increase electrical activity of the masseter. CONCLUSION: patients with more severe conditions show lower supra hyoid electric activity, and the electric activity of the masseter is related to difficulty in swallowing.


Assuntos
Transtornos de Deglutição/diagnóstico , Músculo Masseter/fisiopatologia , Esclerose Múltipla/complicações , Adulto , Estudos Transversais , Transtornos de Deglutição/etiologia , Transtornos de Deglutição/fisiopatologia , Eletromiografia , Humanos , Masculino , Pessoa de Meia-Idade , Esclerose Múltipla/fisiopatologia , Inquéritos e Questionários , Adulto Jovem
8.
Neurophysiol Clin ; 49(5): 381-384, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31727406

RESUMO

We hypothesized that brainstem responses may allow detection of functional brainstem changes in patients with neuro-Behçet Disease (NBD). Thus, we recorded electrically-induced blink reflex (eBR), auditory blink reflex (aBR) and electrically-induced masseter inhibitory reflex (eMIR) in 16patients with NBD. However, these neurophysiological tests proved to have a poor overall sensitivity compared to neuroimaging for the diagnosis of brainstem lesions. They also showed low sensitivity for the differential diagnosis of focal pontine lesion versus diffuse brainstem disease in NBD.


Assuntos
Síndrome de Behçet/fisiopatologia , Tronco Encefálico/fisiopatologia , Músculo Masseter/fisiopatologia , Encefalopatias/fisiopatologia , Feminino , Humanos , Masculino , Tempo de Reação , Reflexo Anormal/fisiologia
9.
Clin Neurol Neurosurg ; 187: 105555, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31639632

RESUMO

OBJECTIVES: The aim of the present study is to explore inter-rater reliability of primitive signs in a group of patients assessed for dementia. PATIENTS AND METHODS: 97 patients admitted to our University Hospital for cognitive impairment were enrolled in the study. The mean age was 73.04 ±â€¯8.68 (53 females and 44 males). All patients were examined by two cognitive neurologists in a blind fashion. The grasp reflex, the snout reflex, the glabella tap reflex and the palmomental reflex were elicited according to the current literature. Moreover, we add a stretch reflexes (the masseter reflex) to our battery. RESULTS: The most frequent primitive reflex was the palmomental reflex followed by the glabella tap, snout, and grasp. The inter-rater reliability was measured for each primitive reflex: grasp reflex (0.884) have a strong correspondence; the glabella tap (0.556), the palmomental (0.516) and the snout reflex (0.445) have otherwise a weak correspondence. The masseter reflex reaches a moderate agreement (0.662). All the measurements reached statistical significance (p < 0.005). CONCLUSION: The results of the study show weak to substantial agreement for primitive signs and the masseter reflex as expressed by the low-to-high kappa values.


Assuntos
Demência/diagnóstico , Exame Neurológico/métodos , Adulto , Idoso , Idoso de 80 Anos ou mais , Demência/psicologia , Escolaridade , Feminino , Força da Mão , Humanos , Masculino , Músculo Masseter/fisiopatologia , Pessoa de Meia-Idade , Exame Neurológico/normas , Testes Neuropsicológicos , Variações Dependentes do Observador , Reflexo , Reflexo Anormal , Reflexo de Estiramento , Reprodutibilidade dos Testes
10.
J Plast Surg Hand Surg ; 53(5): 316-319, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31187673

RESUMO

Hemifacial microsomia (HFM) is a malformation characterized by asymmetric facial growth with mandibular and muscular involvement. There are no reports focused on the functional status of the masticatory system of patients with HFM. The objective of this work evaluate bite force and electrical activity of masseter muscle in children with HFM, and compare them to healthy controls. A cross-sectional study was performed to compare bite force and electrical activity of masseter muscle between subjects with HFM and healthy children. Mean bite force (MBF) and surface electromyography (EMG) on maximum intercuspation (MIC) and rest position (RP) from both sides of the face were recorded. Comparative statistics between HFM patients and controls were performed using the Mann-Whitney test, Wilcoxon's signed rank test was used to compare the microsomic and healthy hemifaces. Twenty children with HFM and 10 controls were included, average age was 7.2 years (range 3-14). MBF did not show statistical significance between both groups. Surface EMG signal at MIC was significantly diminished when compared to the healthy side (p = .003) and to the control group (p = .016), this significance was also present at RP when comparing the affected and non-affected sides of the face (p < .01) but not against the controls (p = .08). This study showed that patients with HFM had diminished EMG values of the masseter muscle on the affected side, compared to healthy individuals, but bite force did not show significant alterations.


Assuntos
Força de Mordida , Eletromiografia , Síndrome de Goldenhar/fisiopatologia , Músculo Masseter/fisiopatologia , Adolescente , Estudos de Casos e Controles , Criança , Pré-Escolar , Estudos Transversais , Feminino , Humanos , Masculino
11.
Medicina (Kaunas) ; 55(6)2019 Jun 07.
Artigo em Inglês | MEDLINE | ID: mdl-31181706

RESUMO

Objectives: This review investigated the effects of orthodontic or functional orthopedic therapy on masseter muscle thickness through the use of ultrasonography (US) in growing subjects when compared with untreated subjects. Materials and Methods: This review systematically assessed studies that investigated growing subjects undergoing orthopedic therapy for the correction of malocclusion of vertical, sagittal and transversal plane. Electronic databases (CENTRAL, MEDLINE-PubMed, Scopus and Web of Science) were searched up to February 2019, including available RCTs and CCTs, without language restrictions. The primary outcome was the effect of orthopedic or functional treatment on masseter muscle thickness. The risk of bias of included studies was assessed through the Newcastle-Ottawa quality assessment scale with the aim of defining their methodological quality. A random-effects meta-analysis analyzing mean differences with 95% confidence intervals was used for quantitative analysis. Results: The search retrieved 749 titles, but the studies selection resulted in a final sample of 5 CCTs. The studies retrieved data from 233 children (age range: 5-22 years) and were conducted at university dental clinics. Children were treated for Class II malocclusion, increased vertical dimension or lateral cross-bite variably with rapid or slow maxillary expansion, twin block, bite block, mandibular activators, quad helix, alone or in combination. Risk of bias was assessed as medium for three studies, low for one and high for another. The meta-analysis determined that at the end of orthopedic or functional treatment masseter muscle thickness, measured through the use of US, is significantly reduced (MD -0.79 mm; 95% CI -1.28 to -0.31). The reduction in muscle thickness, therefore, could be considered an indicator for the evaluation of the success of therapy with orthodontic appliances. Conclusions: Although the meta-analysis revealed that US could be considered a less invasive and effective method to evaluate the masseter muscle thickness, single-blinded RCTs, are required to confirm US reliability in this field of application. This review was registered on PROSPERO with the following registration number: CRD42018068402.


Assuntos
Músculo Masseter/anormalidades , Ortodontia Corretiva/normas , Ultrassonografia/métodos , Adolescente , Criança , Pré-Escolar , Feminino , Humanos , Masculino , Mandíbula/anormalidades , Músculo Masseter/fisiopatologia , Ortodontia Corretiva/métodos , Procedimentos Ortopédicos/métodos , Procedimentos Ortopédicos/normas , Adulto Jovem
12.
Clin Neurophysiol ; 130(8): 1455-1459, 2019 08.
Artigo em Inglês | MEDLINE | ID: mdl-31164256

RESUMO

OBJECTIVE: The stimulation of the masseteric nerve elicits a homonymous and a heteronymous H reflex in the masseter muscle and in the temporalis one. The presence of the H reflex may be considered a sign of upper motor neuron (UMN) involvement in amyotrophic lateral sclerosis (ALS) patients. The aim of this study was to evaluate the presence of the heteronymous H reflex in patients with ALS and compare it with normal subjects. METHODS: We enrolled 36 ALS patients and 52 healthy subjects. We stimulated the masseteric nerve in the infratemporal fossa and recorded the muscle responses ipsilaterally to the stimulation. RESULTS: The heteronymous temporalis H reflex was elicitable in 88.9% of ALS patients and in none of the controls. CONCLUSION: The heteronymous H reflex does not disappear when the stimulation intensity is increased. It can be used as sign of UMN involvement and may prove useful in patients with suspected MND/ALS with purely lower motor neurons (LMN) signs and no signs of UMN involvement. SIGNIFICANCE: The heteronymous H reflex is present far more often in ALS patients than in healthy people. It is a simple test that may be used to detect UMN involvement in patients in whom the only evident signs are LMN impairment, improving diagnosis of ALS.


Assuntos
Esclerose Amiotrófica Lateral/fisiopatologia , Reflexo H , Músculo Masseter/fisiopatologia , Idoso , Feminino , Humanos , Masculino , Nervo Mandibular/fisiopatologia , Pessoa de Meia-Idade , Neurônios Motores/fisiologia
13.
Lasers Med Sci ; 34(9): 1841-1847, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30969378

RESUMO

Temporomandibular disorder (TMD) is a collective term that encompasses a set of clinical problems that affect the masticatory muscles, the temporomandibular joint, and associated structures. Despite their high clinical prevalence, the mechanisms of chronic craniofacial muscle pain are not yet well understood. Treatments for TMD pain relief and control should be minimally invasive, reversible, and conservative. Photobiomodulation (PBM) is a promising option once it is known to inhibit inflammatory response and to relief painful symptoms. Herein, the effects of PBM (660 nm, 30 mW, 16 J/cm2, 0.2 cm2, 15 s in a continuous frequency) on the pain sensitivity of rats submitted to an experimental model of TMD induced by CFA was evaluated. Experimental TMD was induced in rats by the injection of complete Freund's adjuvant (CFA) injection into the masseter muscle. Nociceptive behavior was evaluated by electronic von Frey before CFA and after 1 h, 3 h, 6 h, and 24 h and 7, 14, and 21 days after PBM treatment. Inflammatory infiltrate was evaluated by histology of the masseter muscle and fractalkine expression was evaluated by immunohistochemistry of the trigeminal ganglia. PBM reversed the mechanical hypersensitivity of the animals by inhibiting the local inflammatory response, observed by the decrease of the inflammatory infiltrate in the masseter muscle of rats and by a central inhibition of fractalkine observed in the trigeminal ganglion. These data provide new insights into the mechanisms involved in the effects of photobiomodulation therapy emphasizing its therapeutic potential in the treatment of TMD.


Assuntos
Analgesia , Quimiocina CX3CL1/antagonistas & inibidores , Terapia com Luz de Baixa Intensidade , Transtornos da Articulação Temporomandibular/radioterapia , Animais , Quimiocina CX3CL1/metabolismo , Adjuvante de Freund , Masculino , Músculo Masseter/fisiopatologia , Microglia/patologia , Dor/patologia , Manejo da Dor , Ratos Sprague-Dawley , Regeneração , Gânglio Trigeminal/patologia
14.
J Dent Res ; 98(6): 666-672, 2019 06.
Artigo em Inglês | MEDLINE | ID: mdl-30946624

RESUMO

Patients with muscular temporomandibular disorder (TMD) present with abnormal oxygenation of the jaw muscles. Nonetheless, the deoxygenation pattern of jaw muscles of healthy subjects with frequent wake-time tooth-clenching episodes, who are at greater risk for TMD, has never been investigated. This case-control study compared the deoxygenation of the masseter during standardized tasks between TMD-free individuals with frequent self-reports of wake-time clenching and those with infrequent self-reports. University students ( N = 255) filled out the Oral Behavior Checklist. Fourteen females with high versus low scores-high parafunctional (HP) group ( n = 7, ≥80th percentile of score distribution) versus low parafunctional (LP) group ( n = 7, ≤20th percentile)-completed 2 sessions during which they clenched at their maximum voluntary contraction (MVC) for 2 min and at 10% to 20% MVC for 20 min. Tissue oxygen saturation (StO2) and changes in oxygenated hemoglobin, deoxygenated hemoglobin, and total hemoglobin of the masseter were measured via near-infrared spectroscopy and analyzed with a generalized mixed effect model. A significant interaction effect (task × study group) was found on all outcome measures, indicating that the deoxygenation pattern of the HP group differed from the LP group (all P < 0.001). MVC of the masseter induced an almost 5-times-greater reduction of StO2 in the HP group as compared with the LP group ( P = 0.023). However, the relative increase in StO2 at rest after the MVC was similar between groups ( P > 0.05). At the end of the prolonged MVC task (10% to 20%), the blood flow (change in total hemoglobin) was almost 6 times higher in the LP group as compared with baseline. On the contrary, it increased minimally in the HP group (all P < 0.001). Healthy individuals at risk for TMD have abnormalities in masseter deoxygenation. Future prospective studies are needed to test whether this contributes to the onset of muscular TMD.


Assuntos
Bruxismo , Músculo Masseter/fisiopatologia , Oxigênio , Transtornos da Articulação Temporomandibular , Adulto , Estudos de Casos e Controles , Eletromiografia , Feminino , Humanos , Contração Muscular
15.
J Craniofac Surg ; 30(6): e547-e551, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31022137

RESUMO

This study aimed to determine the electrical activity of masseter and anterior temporal muscles in patients with unilateral cleft lip and palate (CLP) and compare it with healthy volunteers. The study involved 20 female patients (mean age 20 ±â€Š4 years) with unilateral cleft lip and palate who had undergone lip and palate surgery in childhood and finished the first-phase orthodontic therapy with level and align teeth. Twenty age- and sex-matched volunteers with no cleft lip and palate were involved as controls. Electromyographic (EMG) signals of masseter and anterior temporal muscles were recorded at rest position, during swallowing and during maximum bite force (MBF). EMG signals at different test conditions were compared between the cleft and noncleft sides of CLP patients and between CLP patients and healthy individuals. The EMG potentials of masseter (rest, swallowing, MBF) and temporal (rest, MBF) muscles were significantly higher in the cleft than the noncleft side of CLP patients (P value <0.001). Generally, patients with unilateral cleft lip and palate experienced a significant increase in the electrical activity of the masseter and temporal muscles in both sides compared to the control group (P <0.05). In conclusion, patients with unilateral cleft lip and palate exhibit overall greater masticatory muscle activity compared to healthy individuals. The asymmetric masticatory function in subjects with unilateral cleft lip and palate may be associated with severe consequences such as asymmetric facial growth, implying the importance of early diagnosis and orthodontic treatment to achieve a favorable environment for balanced facial growth in CLP affected patients.


Assuntos
Fenda Labial/cirurgia , Fissura Palatina/cirurgia , Músculo Masseter/fisiopatologia , Músculo Temporal/fisiopatologia , Adolescente , Adulto , Força de Mordida , Deglutição , Feminino , Humanos , Músculo Masseter/cirurgia , Músculo Temporal/cirurgia , Adulto Jovem
16.
Med Oral Patol Oral Cir Bucal ; 24(2): e165-e171, 2019 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-30818308

RESUMO

BACKGROUND: Neurodegenerative diseases that affect the cerebellum, especially in elderly individuals, cause impairment of motor coordination and quality of life. The presente study evaluated the electromyographic activity and thickness of the right and left masseter and temporal muscles, and the maximum molar bite force of individuals with spinocerebellar ataxia. MATERIAL AND METHODS: Twenty-eight individuals were divided into two groups: those with (n=14) and without (n=14) spinocerebellar ataxia. Data on the masticatory muscles obtained from the electromyographic activity (resting, right and left laterality and protrusion), muscle thickness (maximal voluntary contraction and tensile strength) and maximum bite force (right and left) were tabulated and descriptive analysis using Student's t-test (P ≤ 0.05). RESULTS: In the comparison between groups, greater electromyographic activity was demonstrated for individuals with spinocerebellar ataxia, with a statistically significant difference in protrusion and laterality for the temporal muscles (P = 0.05). There was no statistically significant difference between the groups for masticatory muscles thickness in the conditions evaluated. For maximum molar bite force, the group with spinocerebellar ataxia showed lower bite force (P ≤ 0.05). CONCLUSIONS: The data obtained suggest that spinocerebellar ataxia promotes functional reduction in the stomatognathic system, mainly affecting the electromyographic activity and bite force, hindering chewing, with a resultant alteration of nutritional intake and a decrease of quality of life.


Assuntos
Força de Mordida , Ataxias Espinocerebelares/fisiopatologia , Sistema Estomatognático/fisiopatologia , Adulto , Brasil , Estudos de Casos e Controles , Oclusão Dentária , Eletromiografia , Feminino , Lateralidade Funcional , Humanos , Masculino , Mandíbula , Músculo Masseter/fisiopatologia , Mastigação , Músculos da Mastigação/fisiopatologia , Pessoa de Meia-Idade , Dente Molar , Estudos Prospectivos , Qualidade de Vida , Músculo Temporal/fisiopatologia , Transtornos da Articulação Temporomandibular/fisiopatologia
17.
Neurol Sci ; 40(Suppl 1): 169-173, 2019 May.
Artigo em Inglês | MEDLINE | ID: mdl-30825018

RESUMO

INTRODUCTION: The authors tried to establish whether there is any electrophysiological difference of masticatory muscle activity between patients with persistent idiopathic facial pain (PIFP) and healthy subjects. METHODS: Twenty-eight PIFP patients (6 men and 22 women, mean age 40 years) and 28 normal subjects (12 men and 16 women, mean age 40 years) underwent EMG of temporal and masseter muscles before and after transcutaneous electric nerve stimulation (TENS). RESULTS: After TENS stimulation, the mean amplitude difference was found to be smaller than the baseline before TENS in the PIFP patients compared with healthy subjects. CONCLUSIONS: The peculiar behavior of masticatory muscles after TENS could be relevant in order to explain the well-known improvement of pain reported by some PIFP patients after orthosis positioning.


Assuntos
Dor Facial/terapia , Músculo Masseter/cirurgia , Músculos da Mastigação , Transtornos da Articulação Temporomandibular/cirurgia , Adulto , Eletromiografia/métodos , Fenômenos Eletrofisiológicos/fisiologia , Dor Facial/diagnóstico , Feminino , Humanos , Masculino , Músculo Masseter/fisiopatologia , Pessoa de Meia-Idade , Estimulação Elétrica Nervosa Transcutânea/métodos , Resultado do Tratamento
18.
Med. oral patol. oral cir. bucal (Internet) ; 24(2): e165-e171, mar. 2019. tab
Artigo em Inglês | IBECS | ID: ibc-180639

RESUMO

Background: Neurodegenerative diseases that affect the cerebellum, especially in elderly individuals, cause impairment of motor coordination and quality of life. The presente study evaluated the electromyographic activity and thickness of the right and left masseter and temporal muscles, and the maximum molar bite force of individuals with spinocerebellar ataxia. Material and Methods: Twenty-eight individuals were divided into two groups: those with (n=14) and without (n=14) spinocerebellar ataxia. Data on the masticatory muscles obtained from the electromyographic activity (resting, right and left laterality and protrusion), muscle thickness (maximal voluntary contraction and tensile strength) and maximum bite force (right and left) were tabulated and descriptive analysis using Student’s t-test (P ≤ 0.05). Results: In the comparison between groups, greater electromyographic activity was demonstrated for individuals with spinocerebellar ataxia, with a statistically significant difference in protrusion and laterality for the temporal muscles (P = 0.05). T here was no statistically significant d ifference b etween t he g roups for m asticatory muscles thickness in the conditions evaluated. For maximum molar bite force, the group with spinocerebellar ataxia showed lower bite force (P ≤ 0.05). Conclusions: The data obtained suggest that spinocerebellar ataxia promotes functional reduction in the stomatognathic system, mainly affecting the electromyographic activity and bite force, hindering chewing, with a resultant alteration of nutritional intake and a decrease of quality of life


No disponible


Assuntos
Humanos , Masculino , Feminino , Adulto , Pessoa de Meia-Idade , Ataxias Espinocerebelares/fisiopatologia , Sistema Estomatognático/fisiopatologia , Músculos da Mastigação/fisiopatologia , Perfil de Impacto da Doença , Eletromiografia , Força de Mordida , Músculo Masseter/fisiopatologia , Músculo Temporal/fisiopatologia , Estudos Prospectivos , Estudos de Casos e Controles
19.
Microsc Res Tech ; 82(5): 530-537, 2019 May.
Artigo em Inglês | MEDLINE | ID: mdl-30741445

RESUMO

Stress is associated with orofacial pain sensitivity and is qualified as a temporomandibular disorder risk factor. During stressful periods, painful thresholds of masticatory muscles in individuals suffering muscle facial pain are significantly lower than in controls, but the exact physiologic mechanism underlying this relation remains unclear. Our hypothesis is that chronic unpredictable stress and masticatory hypofunction induce morphologic and metabolic masseter muscle changes in rats. For test this hypothesis, adult Wistar rats were submitted to chronic unpredictable stress and/or exodontia of left molars and the left masseter muscle was removed for analysis. The parameters evaluated included ultrastructure, oxidative level, metabolism activity and morphological analysis in this muscle. Our data show by histological analysis, that stress and exodontia promoted a variation on diameters and also angled contours in masseter fibers. The masticatory hypofunction increased oxidative metabolism as well as decreased reactive species of oxygen in masseter muscle. The ultrastructural analysis of muscle fibers showed disruption of the sarcoplasmic reticulum cisterns in certain regions of the fiber in stress group, and the disappearance of the sarcoplasmic reticulum membrane in group with association of stress and exodontia. Our findings clarify mechanisms by which chronic stress and masticatory hypofunction might be involved in the pathophysiology of muscular dysfunctions. Masticatory hypofunction influenced oxidative stress and induced oxidative metabolism on masseter muscle, as well as altered its fiber morphology. Chronic stress presented malefic effect on masseter morphology at micro and ultra structurally. When both stimuli were applied, there were atrophic fibers and a complete mitochondrial derangement.


Assuntos
Músculo Masseter/patologia , Músculo Masseter/fisiopatologia , Mitocôndrias/patologia , Fibras Musculares Esqueléticas/patologia , Dor/complicações , Doenças Estomatognáticas/complicações , Animais , Modelos Animais de Doenças , Estresse Oxidativo , Ratos Wistar , Extração Dentária
20.
Sleep Breath ; 23(1): 363-372, 2019 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-30685853

RESUMO

PURPOSE: Although sleep bruxism (SB) is one of the most important clinical problems in dental practice, there is no definitive method for controlling it. This pilot study evaluated the effects of contingent vibratory feedback stimuli using an occlusal splint for inhibition of sleep bruxism. METHODS: Thirteen subjects with clinically diagnosed SB participated after providing an informed consent. Portable polysomnographic recordings were conducted in the subjects' home environment to make a definitive SB diagnosis and to evaluate the effects of the vibratory stimuli on SB. A force-based bruxism detection system, which used a pressure-sensitive piezoelectric film embedded in the occlusal splint, was utilized to trigger vibration feedback stimuli, which was scheduled to be applied intermittently for 30 min, at 30-min intervals. RESULTS: The number of SB episodes (times/hour), the total SB duration (seconds/hour), the mean duration of SB episodes (seconds/episode), and the micro-arousal index (times/hour) were scored for each time period (with and without vibration). The effects of the vibration on these scores were tested (paired t test; p < 0.05). The number of SB episodes tended to decrease with the vibration stimuli, and the decrease in the total SB duration was statistically significant (14.3 ± 9.5 vs. 26.0 ± 20.0, p = 0.03). No substantial change was found in terms of the micro-arousal index. CONCLUSIONS: These study results suggested that the SB inhibitory system employing a vibratory stimulus might be able to suppress the total SB duration without disturbing sleep.


Assuntos
Bruxismo do Sono/terapia , Vibração/uso terapêutico , Adulto , Nível de Alerta , Eletromiografia , Desenho de Equipamento , Retroalimentação , Feminino , Humanos , Masculino , Músculo Masseter/fisiopatologia , Placas Oclusais , Projetos Piloto , Polissonografia , Bruxismo do Sono/diagnóstico , Bruxismo do Sono/fisiopatologia
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