Rodrigues Carolina Almeida, Melchior Melissa de Oliveira, Magri Laís Valencise, Mestriner Wilson, Mazzetto Marcelo Oliveira
Department of Restorative Dentistry, Ribeirão Preto School of Dentistry, USP - University of São Paulo, Ribeirão Preto, SP, Brazil.
Braz Dent J. 2015 Mar-Apr;26(2):181-5. doi: 10.1590/0103-6440201300198. Epub 2015 Apr 1.
Patients with temporomandibular disorders (TMD) often complain and have limitation in masticatory function, which can be affected by a complex interaction of factors. The aim of this study was analyze the masticatory function in patients with TMD using surface electromyography (EMG) and masticatory efficiency (ME). Twenty-seven patients with TMD and 25 considered control (n), aged between 18 and 60 years, paired by age and gender, were evaluated according to RDC/TMD. In both groups were performed: EMG with chewing gum, clinical evaluation of habitual chewing with stuffed cookie (CE) (number of chewing strokes and time) and analysis of ME with fuchsin beads. Nonparametric statistical analyses were used (Mann-Whitney) for comparisons between groups, with 5% significance level. For all variables, the TMD group showed higher values than the control, with statistical significance for ME (p<0.0001), number of chewing strokes (p=0.04), chewing time (p=0.009), right masseter EMG activity (p=0.05), left masseter (p=0.005), right anterior temporal (p=0.05) and left anterior temporal (p=0.001). The conclusion is that patients with TMD showed changed chewing pattern, but without impairment of masticatory function.
颞下颌关节紊乱病（TMD）患者常主诉咀嚼功能受限，且该功能会受到多种因素复杂相互作用的影响。本研究的目的是使用表面肌电图（EMG）和咀嚼效率（ME）分析TMD患者的咀嚼功能。根据RDC/TMD对27例TMD患者和25例对照者（年龄在18至60岁之间，按年龄和性别配对）进行评估。两组均进行了以下操作：咀嚼口香糖时的EMG检查、用夹馅饼干进行习惯性咀嚼的临床评估（CE）（咀嚼次数和时间）以及用品红珠子分析ME。采用非参数统计分析（曼-惠特尼检验）进行组间比较，显著性水平为5%。对于所有变量，TMD组的值均高于对照组，ME（p<0.0001）、咀嚼次数（p=0.04）、咀嚼时间（p=0.009）、右侧咬肌EMG活动（p=0.05）、左侧咬肌（p=0.005）、右侧颞前肌（p=0.05）和左侧颞前肌（p=0.001）具有统计学意义。结论是TMD患者的咀嚼模式发生了改变，但咀嚼功能未受损。
