Tempo de ativação muscular em portadoras de disfunção temporomandibular durante a mastigação

Machado, Mariana Barcellos; Nitsch, Gabriel Silva; Pitta, Natássia Condilo; Oliveira, Anamaria Siriani de

doi:10.1590/s2317-64312014000200016

Cited by 6 publications

(17 citation statements)

References 16 publications

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“…(17) Dentists have a risk factor for TMD, since during the visits, both head and body posture is not adequate. According to Viana et al the posture of the head interferes with the posture of the mandible and the opposite can also happen, agreeing with Souza, who says that individuals with TMD present postural changes, mainly in head posture.…”

Section: Discussionmentioning

confidence: 99%

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Assessment of Temporomandibular Dysfunction and Mandibular Functional Impairment in Dentistry Academics

Guimarães¹,

Goulart

Makhoul

et al. 2020

mtprehabjournal

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Introduction: Temporomandibular dysfunction (TMD) is a collective term adding up the entire problems related to temporomandibular joint (TMJ) and the mandibular functional impairment is one of the symptoms of TMD. It is known that the posture influences the onset of TMD, thus, as in the appearance of mandibular functional impairment. Dentists remain in inadequate positions during their workday, thus presenting an important risk factor for the onset of TMD. Objective: To classify temporomandibular dysfunction and mandibular functional impairment in undergraduates of the 8th period of the Dentistry course in the "Centro Universitário do Triângulo-UNITRI", in Uberlândia, MG, Brazil. Methodology: This is a cross-sectional, practical, exploratory with a quantitative approach, epidemiological study carried out through application of two questionnaires: Mandibular Functional Impairment Index (MFIQ) and Clinical Dysfunction Index (IDCCM or Helkimo Index). Results: The results found in the present study showed a higher prevalence of moderate TMD (70,83%), followed by mild TMD (16.67%) and severe TMD (12,50%) and all participants were classified with mandibular functional impairment of low severity. Conclusion: The results of this research showed a high prevalence of moderate TMD in dentistry students and that there is no correlation between TMD and mandibular functional impairment. It was observed that many students had pain in the neck and/or shoulder.

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Section: Discussionmentioning

confidence: 99%

“…(19,21,22) Individuals with TMD can be studied through characteristic signs and symptoms. (17) According to Bassi et al and Pachioni et al the mandibular functional impairment is one of the main symptoms of TMD, being used even through the MFIQ as a parameter to follow treatment evolution of patients with TMD.…”

Section: Discussionmentioning

confidence: 99%

Assessment of Temporomandibular Dysfunction and Mandibular Functional Impairment in Dentistry Academics

Guimarães¹,

Goulart

Makhoul

et al. 2020

mtprehabjournal

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“…Other techniques for treating myogenic TMD can be considered for assessing the responsiveness of duty factor, such as the use of muscle relaxants or the contract-relax technique, being as the measurement differentiates asymptomatic individuals from those with myogenic TMD (2) and presents excellent intrasession reliability.…”

Section: Discussionmentioning

confidence: 99%

“…The masticatory muscles of individuals with temporomandibular disorders (TMD) are more easily fatigued and hyperactivated when exposed to abnormalities of movement, structure, posture, or even worse, stress or pain (2) . In addition to fatigue and hyperactivity, an altered pattern of muscle activation occurs, according to the pain adaptation model.…”

Section: Introductionmentioning

confidence: 99%

Propriedades clinimétricas da variável eletromiográfica duty factor para desordem temporomandibular

Nitsch

Mella

Chaves

et al. 2015

Audiol., Commun. Res.

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Purpose: To assess the reliability and responsiveness of the duty factor variable for assessing pain originating from temporomandibular disorders. Methods: The sample comprised 20 female volunteers, mean age 29 years 6 months (± 9.2), with a diagnosis of myogenic temporomandibular dysfunction according to the Research Diagnostic Criteria for Temporomandibular Disorders. Electromyographic (EMG) signals were collected at three times: during mandibular rest; in the presence of moderate to severe pain; and when pain was reduced to mild or absent after 45 minutes of transcutaneous electrical nerve stimulation (TENS).Electromyographic signals during mandibular rest were processed to obtain values for muscle activation time greater than 10% of maximum bite force. Reliability was tested with intraclass correlation for repeated data before analgesia. Standard error of measurement (SEM) and minimum detectable change (MDC) were also computed to determine reliability. Responsiveness of duty factor was analyzed between EMG recordings, before and after analgesia, by calculating effect size (ES) and standardized response mean (SRM). Results: Duty factor presented intraclass correlation coefficient above 0.75 for all muscles. Standard error of measurement ranged from 4% to 8% and minimum detectable change from 5% to 12%. Regarding the responsiveness of duty factor to pain, effect size values fell between 0.2 and 0.5 and SRM values were greater than 0.8. Conclusion: Duty factor showed excellent reliability.However, responsiveness to TMD-related pain was low as expressed by effect size and excellent as expressed by standardized response mean. O erro padrão foi entre 4% e 8% e a mínima mudança detectável entre 5% e 12%. Na responsividade da variável para a dor, o tamanho de efeito obteve valores entre 0,2 e 0,5 e a média da resposta padronizada, valores acima de 0,8. Conclusão: O duty factor apresentou confiabilidade excelente e responsividade à dor da desordem temporomandibular baixa para tamanho de efeito e excelente para média da resposta padronizada.

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“…An accurate diagnosis of TMD is critical for treatment planning and increases the chances of successful outcomes. Evidence suggests that individuals with TMD have a lower rate of motor unit discharge in painful muscles [ 4 , 5 , 6 ] and early fatigue, compared with individuals without TMD [ 7 , 8 ]. Surface electromyography (sEMG) provides a direct and objective assessment of muscle excitation [ 4 , 5 ] and can aid in the diagnosis of TMD, particularly the assessment of masticatory muscle activity in patients with impaired function and altered jaw movement patterns [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Masticatory Myoelectric Side Modular Ratio Asymmetry during Maximal Biting in Women with and without Temporomandibular Disorders

et al. 2022

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There is no consensus on the role of electromyographic analysis in detecting and characterizing the asymmetries of jaw muscle excitation in patients with temporomandibular disorders (TMD). To analyze the TMD patients (n = 72) in comparison with the healthy controls (n = 30), the surface electromyography (sEMG) of the temporalis anterior muscle (TA) and masseter muscle (M) was recorded while a maximal biting task was performed. The differences in the asymmetry of the relationship between the masseter muscles were assessed in a module to determine the sensitivity (Sn) of binomial logistic models, based on the dominance of the TA or the M muscle, in accurately predicting the presence of TMD. All assumptions were met, and comparisons between the groups showed significant differences for the TA muscle ratio (p = 0.007), but not for the M muscle ratio (p = 0.13). The left side was predominant over the right side in the TMD group for both the TA (p = 0.02) and M muscles (p = 0.001), while the non-TMD group had a higher frequency of the right side. Binary logistic regression showed a significant model (χ2 = 9.53; p = 0.002) for the TA muscle with Sn = 0.843. The model for the M muscle also showed significance (χ2 = 8.03; p = 0.005) with Sn = 0.837. The TMD patients showed an increased TA muscle ratio and asymmetry of left dominance, compared to the healthy subjects. Both of the binomial logistic models, based on muscle dominance TA or M, were moderately sensitive for predicting the presence of TMD.

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Tempo de ativação muscular em portadoras de disfunção temporomandibular durante a mastigação

Cited by 6 publications

References 16 publications

Assessment of Temporomandibular Dysfunction and Mandibular Functional Impairment in Dentistry Academics

Assessment of Temporomandibular Dysfunction and Mandibular Functional Impairment in Dentistry Academics

Propriedades clinimétricas da variável eletromiográfica duty factor para desordem temporomandibular

Masticatory Myoelectric Side Modular Ratio Asymmetry during Maximal Biting in Women with and without Temporomandibular Disorders

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