Mastigação habitual e atividade eletromiográfica dos músculos masseter e temporal em escolares de 7 a 12 anos

Abstract

Conflict of interest: non-existent stimulation of supporting structures, such as bones and teeth and for favoring that the harmonious craniofacial growth occurs³ .The chewing pattern can be influenced by several factors, such as occlusal interferences, dental and/ or periodontal problems, tooth loss, muscle and/or temporomandibular joints problems².It is known that in a unilateral mastication, the chewing muscles are mainly characterized by increased muscle strength on the working side, in other words, where chewing is occurring. The muscles of the balancing side, opposite side to the working side, is generally more elongated and with NTRODUCTIONChewing is considered by many authors as one of the most important and most studied functions of the stomatognathic system¹,². When performed in a alternating bilateral way, there is synchrony of masticatory muscles, which in turn are crucial for the ABSTRACT Purpose: to investigate the relationship of the masticatory preference side in the electrical activity of masseter and temporalis muscles. Methods: the sample was composed by 115 children aged between 7 and 12 years. The acquisition of the electrical activity of the masticatory muscles was recorded during 5 seconds of isometric contraction in maximal intercuspal position. The children were divided into four groups according to masticatory preference observed: Chewing Preferential Right, Left, Bilateral Alternating, and Bilateral Simultaneous. The electromyographicdata were analyzed using the SPSS 17.0 software, and for determination of statistical difference between the electrical activity of the right and left masseter and temporalis muscles was performed by Paired Student t-test (p <0.05). Results: from the total of 115 children, 76 (63.4%) had a preferred side during mastication, whereas 44 (36.7%) children had masticatory right and 32 (26.7%) preferred chewing left. Of the individuals without a preferred side, it was found 25.8% (n = 31) alternating with bilateral chewing and 10.8% (n = 13) with simultaneous bilateral chewing. After comparing the electrical activity of the masseter and temporal, right and left, according to the group chewing, it was found that the average electrical activity of the muscles on the left side showed no statistically significant differences when compared with the average of its peers right side. Conclusion: for the study sample, there was no relationship between the habitual chewing side and electrical activity of the muscles masseter and temporal.

Perfil mastigatório em crianças de três a cinco anos de idade

“…The results characterization regarding the mastication preference showed that most children presented a preferential side during usual mastication, agreeing with other researches 11,16,26 . Other studies indicated predominance of bilateral mastication [12][13][14]17 .…”

“…Studies about the mastication function in children present data about the side of preferential mastication [12][13][14][15][16] , proprioception (escape of food) 15 , way of incision 15 , lips posture 12,14,15,17 , participation of perioral musculature 12,14,17 and predominant mandibular movement 12,14,17,18 .…”

Análise da mastigação e da saciedade em escolares

“…Independente da classificação do estado nutricional, a maioria das crianças apresentou uma mastigação unilateral, assim como identificado por Garcia et al 14 Não houve a presença de ruídos durante o consumo dos alimentos avaliados neste estudo, diferindo daquele realizado com acadêmicos do Curso de Nutrição, em que 6,70% apresentaram ruídos durante o consumo do pão de sal 10 .…”