Influence of temporomandibular disorder on temporal and masseter muscles and occlusal contacts in adolescents: an electromyographic study

Abstract

BackgroundThe aim of the present study was to analyse the influence of temporomandibular disorder (TMD) on electromyographic activity in the masseter and temporal muscles of adolescents and investigate a possible association with the number of occlusal contacts.MethodsThe Helkimo Index was administered for the diagnosis of TMD and classification of the adolescents into three groups: without TMD; with mild TMD; and with moderate/severe TMD. Carbon paper was used for the determination of occlusal contact points. A standardised electromyographic evaluation was performed on the masticatory muscles at rest, during habitual chewing and during maximum voluntary clenching. The readings were normalised to maximum voluntary clenching. Statistical analysis involved the chi-squared test and Fisher’s exact test. The Kruskal-Wallis test and one-way analysis of variance with Dunn’s post hoc test were used to compare differences between groups. Pearson’s correlation coefficients (r) were calculated for the determination of correlations between the number of occlusal contacts and RMS values.ResultsElectromyography revealed significant differences in the right and left masseter and temporal muscles at rest and during chewing among the three groups. These differences were not observed during maximum voluntary clenching. No statistically significant differences were found between the groups with and without TMD regarding the number of occlusal contacts.ConclusionElectromyographic activity in the masseter and temporal muscles was greater among adolescents with moderate to severe TMD.

Accuracy of the surface electromyography RMS processing for the diagnosis of myogenous temporomandibular disorder

“…Due to the multifactor etiology of this condition, the precise diagnosis remains a matter of debate (Medllicott and Harris, 2006) and validated diagnostic tools are needed (Gonzalez et al, 2008). Electronic equipment may provide reliable quantitative data to assist in the clinical evaluation of TMD (Schmitter et al, 2005;Manfredini et al, 2006;Hugger et al, 2008;Lauriti et al, 2014).…”

The knowledge level of dental surgeons regarding the relationship between occlusal factors and Temporomandibular Disorders (TMD)

“…However, the literature does not support this relationship, with studies having found that some patients develop the signs and symptoms of TMD even when no interference is present and even that some individuals with balancing side interference do not have this disorder 22,25,26 .…”

“…It has a multifactorial etiology and, to date, is not fully understood. It is related to psychological, systemic, neurochemical, and genetic factors and the use of certain types of drugs 21,26,27 . Both groups agreed that the presence of occlusal interferences is not related to the occurrence of bruxism 16,17 , although the CG group presented statistically significant differences, with a lesser degree of agreement with this statement than the EG group.…”

Efeito de exercícios motores orofaciais e laserterapia nos sintomas de desordem temporomandibular e funções orofaciais

“…Duarte Kroll et al (2010) (Strini et al, 2013;Lauriti et al, 2014 (Ferrario et al, 2002;Landulpho et al, 2004;Daif, 2012;Venezian, 2012) e laserterapia (Shinozaki et al, 2006). Mas, em outros estudos não foi observado mudanças na atividade EMG após laserterapia (Venezian et al, 2010), massagem, placa oclusal ou combinação de massagem e placa oclusal (Gomes et al, 2014).…”

“…Assim, conhecer o padrão eletromiográfico dos músculos mastigatórios de indivíduos com DTM também auxilia tanto na formulação das estratégias de tratamento destinadas a normalização da atividade muscular e melhora da função do sistema estomatognático (Lauriti et al, 2014) como também na análise do efeito do tratamento (Ferrario et al, 2002;Sforza et al, 2010;Trawitzki et al, 2010), uma vez que nos permite medir a eficiência e as mudanças na atividade muscular (Biasotto-Gonzalez e Bérzin, 2004).…”