Association between chewing dysfunctions and temporomandibular disorders: A systematic review

Abstract

Temporomandibular disorder (TMD) is an umbrella condition presenting several signs and symptoms including pain in the temporomandibular joint (TMJ) and masticatory muscles, articular noises, earache, headache, irregular or restricted jaw function, chewing difficulty, and limited mouth opening. Such TMD impairment may cause disorders during the chewing process. Therefore, the purpose of this systematic review was to assess chewing dysfunctions measured by sEMG, and their association with TMD. A combination and variation in the descriptors "temporomandibular joint disorders", "masticatory dysfunctions", and electromyography were used to perform the searches across databases. The databases chosen were: LILACS, PubMed, Science Direct, Scopus, and Web of Science. Additionally, grey literature was assessed using Google Scholar, ProQuest, and OpenGrey. Studies in adults that diagnosed TMD through the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD), Diagnostic Criteria for Temporomandibular Disorders (DC/TMD) or Helkimo Protocol were selected. Furthermore, those studies should have evaluated chewing processes through surface electromyography (sEMG). Risk of bias of the included studies was assessed through the Meta-Analysis of Statistics Assessment and Review Instrument (MAStARI) tool. Eleven included studies shown significant results; however, they evaluated discrepant parameters, presented high inconsistency in the application, and had chosen different tasks to analyse the sEMG and hence, there was no consensus in the results of studies. In conclusion, strength of recommendations was very low due to a series of limitations on studies and it was not possible to made categorical statement about association between TMD and chewing dysfunctions in adults when parameters of sEMG were analysed.

Risk Factors of the Masticatory Function in Patients with Temporomandibular Disorders: A Cross-Sectional Cohort Study

“…Sieving of chewed natural or artificial food and following determination of the mean particle size is still thought to be the "gold standard" for the quantification of masticatory efficiency [49]. One of the other objective methods to assess the chewing process is surface electromyography but the results of the studies still have been controversial [50]. In conclusion, this cross-sectional study found that the global score of JFLS was the highest in patients with TMD with joint pain, followed by TMD with muscle-joint combined pain, muscle pain and TMD with internal derangement without pain.…”

Disfunção temporomandibular e sono: revisão integrativa de literatura

“…A investigação de parâmetros polissonográficos foi realizada em alguns desses estudos, constatando uma relação entre DTM e dor na musculatura mastigatória e bruxismo do sono [9][10][11] . A literatura aponta que a musculatura mastigatória em indivíduos com bruxismo do sono realiza ações e demandas atípicas, podendo ocasionar alterações neuromusculares capazes de desencadear dor, cansaço e fadiga nesses indivíduos, com possíveis impactos no desempenho da função mastigatória 28 . Outro estudo evidenciou a presença de sonolência diurna excessiva em indivíduos com dor orofacial e com queixas de bruxismo do sono 13 , sendo esse um sintoma comum (sonolência) em indivíduos adultos com possíveis distúrbios do sono 29 .…”

Facial Muscle Activity Patterns in Clarinet Players: A Key to Understanding Facial Muscle Physiology and Dysfunction in Musicians

“…While the use of EMG studies of the masseter and other masticatory muscles is well established in the management of TMJ and orofacial disorders, 19-21 fewer investigations have considered non-masticatory facial muscles. 16,22,23 Surface EMG has been proposed as a noninvasive method for exploring facial muscle function, especially in the fields of experimental psychology, 24 and rehabilitation after facial nerve palsy.…”