Ferrario V F, Sforza C, Tartaglia G M, Dellavia C
Dipartimento di Anatomia Umana, Facoltà di Medicina e Chirurgia and Facoltà di Scienze Motorie, Università degli Studi, via Mangiagalli 31, I-20133 Milano, Italy.
J Oral Rehabil. 2002 Sep;29(9):810-5. doi: 10.1046/j.1365-2842.2002.00927.x.
Surface electromyography (EMG) allows the quantification of the occlusal equilibrium in dysfunctional patients, for instance in those with temporomandibular disorders (TMD). Fourteen patients (ten women, four men) with internal derangement type I were selected among the TMD patients referred to a private practice in Milan. A stabilization splint with posterior contacts was made for each patient. To verify the static neuromuscular equilibrium of occlusion, EMG activity of left and right temporal and masseter muscles was recorded in all patients and the activity (ratio between the activities of the temporal and masseter muscles) index was computed over a maximum voluntary clench test of 3 s. Muscular waveforms were also analysed by computing a percentage overlapping coefficient (POC, an index of the symmetric distribution of the muscular activity determined by the occlusion). The total electrical activity was measured by calculating the area under the entire muscular waveforms. In all patients EMG was performed just before and immediately after the insertion of the splint and data were compared by paired Student's t-tests. Overall, the splint reduced the electrical activity of the analysed muscles (P < 0.005) and made it more equilibrated both between the left and right side (larger symmetry in the masseter muscle POC, P < 0.05) and between the temporal and masseter muscles (activity index, P < 0.01).
表面肌电图（EMG）可用于量化功能障碍患者（例如颞下颌关节紊乱症（TMD）患者）的咬合平衡。在转至米兰一家私人诊所的TMD患者中，挑选出14名I型关节内紊乱患者（10名女性，4名男性）。为每位患者制作了带有后牙接触的稳定牙合垫。为验证咬合的静态神经肌肉平衡，记录了所有患者左右颞肌和咬肌的EMG活动，并在3秒的最大自主紧咬试验中计算活动指数（颞肌与咬肌活动的比率）。还通过计算百分比重叠系数（POC，由咬合决定的肌肉活动对称分布指数）来分析肌肉波形。通过计算整个肌肉波形下的面积来测量总电活动。在所有患者中，在插入牙合垫之前和之后立即进行EMG检查，并通过配对t检验比较数据。总体而言，牙合垫降低了所分析肌肉的电活动（P < 0.005），并使其在左右两侧之间（咬肌POC对称性更高，P < 0.05）以及颞肌和咬肌之间（活动指数，P < 0.01）更加平衡。
