Augusti Davide, Augusti Gabriele, Re Dino, Dellavia Claudia, Giannì Aldo Bruno
Department of Biomedical, Surgical and Dental Sciences, University of Milan, Italy; Division of Oral Rehabilitation, Istituto Stomatologico Italiano, Milan, Italy.
Department of Biomedical, Surgical and Dental Sciences, University of Milan, Italy.
J Electromyogr Kinesiol. 2015 Aug;25(4):612-8. doi: 10.1016/j.jelekin.2015.04.006. Epub 2015 Apr 20.
This study evaluated the influence of two different occlusal indicators (articulating papers of 40μm and 200μm) on muscular activity of the temporalis anterior (TA) and superficial masseter (MS) during maximum voluntary clenches (MVC), using surface electromyography (SEMG). It was hypothesized that an articulating paper positioned between dental arches during MVC elicits a different muscular activity compared with the occlusion on natural dentition (without the occlusal indicator). 30 healthy adult subjects with a complete, natural dentition were recruited; SEMG activity was recorded in the following experimental conditions: MVC with cotton rolls for standardization purposes; MVC on natural dentition; MVC onto the 40μm or 200μm paper indicator positioned on right or left side of the dental arch. Percentage Overlapping Coefficient (POC; separate values obtained for TA and MS), antero-posterior coefficient (APC) and total muscle activities (IMP) were the analyzed SEMG parameters. The use of an occlusal indicator statistically changed POC_TA, POC_MS and IMP median values (p<0.05). Both 40μm and 200μm occlusal papers did not significantly affect APC values (P=0.86). A pronounced asymmetric muscular activity has been recorded with the introduction of an interocclusal media. All indices of muscular activity did not differ between sexes (Kruskal Wallis test, P>0.05). In conclusion, the examined articulating papers affected two specific SEMG parameters (POC and IMP); the recorded muscular activity with the occlusal indicator varied regardless left or right side positioning, and independently from tested paper thicknesses.
本研究采用表面肌电图（SEMG）评估了两种不同的咬合指标（40μm和200μm的咬合纸）对最大自主紧咬（MVC）过程中颞肌前束（TA）和咬肌浅层（MS）肌肉活动的影响。研究假设，在MVC过程中置于牙弓之间的咬合纸所引发的肌肉活动与自然牙列咬合（无咬合指标）时不同。招募了30名具有完整自然牙列的健康成年受试者；在以下实验条件下记录SEMG活动：使用棉卷进行标准化的MVC；自然牙列上的MVC；在牙弓右侧或左侧放置40μm或200μm纸质指标物上的MVC。重叠系数百分比（POC；分别针对TA和MS获得的值）、前后系数（APC）和总肌肉活动（IMP）是分析的SEMG参数。使用咬合指标在统计学上改变了POC_TA、POC_MS和IMP的中位数（p<0.05）。40μm和200μm的咬合纸均未显著影响APC值（P=0.86）。引入咬合介质后记录到明显的不对称肌肉活动。肌肉活动的所有指标在性别之间没有差异（Kruskal Wallis检验，P>0.05）。总之，所检查的咬合纸影响了两个特定的SEMG参数（POC和IMP）；使用咬合指标记录的肌肉活动无论在左侧还是右侧定位均有变化，且与测试的纸张厚度无关。
