Effect of surgically assisted rapid maxillary expansion on masticatory muscle activity: A pilot study

Abstract

Background:The aim of the present study was to analyze the electromyographic (EMG) activity of masseter and temporal muscles of adult patients submitted to surgically assisted rapid maxillary expansion (SARME) before and after the surgery.Materials and Methods:The sample consisted of 19 adults, with ages ranging from 20 to 47 years (mean 25.4 years), with bilateral posterior cross bite requiring SARME treatment. The electromyographic activity of masseter and temporal muscles was analyzed before treatment (T1) and after the surgical procedure (T2). The mean interval between the two electromyographic analyses was 15 days.Results:The muscular active was electromyographically analyzed during the clinical situation of habitual gum chewing (10 sec), dental clenching (4 sec), mouth opening and closing (10 sec), rest (10 sec), protrusion (10 sec), and right and left laterality (10 sec). The measured differences between T1 and T2 data were evaluated using the paired t-test (SPSS 17.0 for Windows). The electromyographic analysis showed that the activity of the masseter and temporal muscles decreased significantly after the SARME in all the clinical situations after the surgery.Conclusion:According to the results of the present study, individuals after SARME surgery presented patterns of electromyographic contraction similar to those developed by dentate individuals during the movements of mandibular excursion.

Impact of midface and upper face fracture on bite force, mandibular mobility, and electromyographic activity

“…23 Stimulation of periodontal proprioceptors has a strong impact on masticatory muscle activity, and a reduction in muscle activity is a result of the defence mechanism. 24,25 When evaluating the maximum bite force (right and left), a lower bite force was observed at 1, 2, and 3 months after surgery for group I, but with a marked improvement at the sixth month evaluation, with a statistically significant improvement over time. The maximum molar bite force values of patients in group II and group II were close to the values of healthy individuals for all of the periods evaluated.…”

Atividade Eletromiográfica Dos Músculos Da Mastigação Em Indivíduos Com Mordida Cruzada Posterior / Electromyographic Activity of Masticatory Muscles in Patients With Posterior Crossbite

“…Entretanto Michelotti et al11 , não encontraram diferença estatisticamente significativa. Regalo et al24 apresentaram resultados que apontam na melhora da atividade muscular nos pacientes tratados com ERM, Michelotti et al11 e Di palma et al15 não encontraram diferenças. Apesar da diferença nos resultados, nenhum dos artigos revisados apontam efeitos adversos da ERM sobre alterações EMG nos músculos TA e MS 9,10.…”

Avaliação eletromiografica, força de mordida e mobilidade mandibular em indivíduos com fraturas de terço médio e superior da face

“…Patients in GII showed a higher activity for the masseter muscles, but had a lower activity for the temporalis muscles, with a statistically significant improvement throughout the study period. The effect of surgery on myoelectric capacity is still unclear 23. Stimulation of periodontal proprioceptors have a strong impact on the masticatory muscle activities and the reduction of muscle activity is a result of the defense mechanism 24,25 .…”

“…Após os procedimentos cirúrgicos, o exame eletromiográfico permite avaliar o quanto e quando a atividade dos músculos é recuperada, e, por meio dessa técnica auxiliar, o profissional pode guiar a atividade diária do paciente, como o tipo de dieta alimentar (TALWAR; ELLIS; THROCKMORTON, 1998;REGALO et al, 2011;RIBEIRO et al, 2011).…”

“…Neste estudo, foi utilizada como metodologia a eletromiografia de superfície, e, pelas análises dos sinais eletromiográficos dos músculos masseteres e temporais nas condições posturais da mandíbula em repouso, lateralidade direita, lateralidade esquerda e protrusão ao longo do tempo, averiguamos o mesmo padrão de atividade mioelétrica em relação aos indivíduos saudáveis (CECÍLIO et al, 2010;PEPATO et al, 2014;REGALO et al, 2011;RIBEIRO et al, 2011). A redução pós-operatória dos movimentos mandibulares tem sido correlacionada com edema e sintomas dolorosos causados pelo tratamento cirúrgico (SFORZA et al, 2010).…”