Valenzuela S, Baeza M, Miralles R, Cavada G, Zúñiga C, Santander H
Department of Prosthodontics, Faculty of Odontology, University of Chile, Santiago.
Angle Orthod. 2006 Jul;76(4):585-90. doi: 10.1043/0003-3219(2006)076[0585:LOSATE]2.0.CO;2.
The objective of this study was to determine the effects of canine guidance and group function on supra- and infrahyoid electromyographic (EMG) activity. The sample included 40 healthy subjects, 20 with bilateral canine guidance and 20 with bilateral group function. Surface electrodes were used to record the integrated EMG (IEMG) activity of the left supra- and infrahyoid muscles during (1) grinding from intercuspal position to lateral edge-to-edge contact position (with canine guidance or group function), (2) static clenching in edge-to-edge lateral contact position with canine guidance or group function, and (3) grinding from lateral edge-to-edge contact position (with canine guidance or group function) to intercuspal position. IEMG activity in the suprahyoid or infrahyoid muscles was not significantly different with canine guidance or group function. Supra- and infrahyoid IEMG activity in condition 2 was significantly higher than in condition 3, which was significantly higher than in condition 1. Supra- and infrahyoid IEMG activity was not significantly different with canine guidance and group function. Supra- and infrahyoid IEMG activity during the static recording (clenching) was significantly higher than during the dynamic recordings (grinding). Activity during grinding from the lateral edge-to-edge contact position to the intercuspal position was higher than vice versa.
本研究的目的是确定尖牙引导和组牙功能对上、下颌舌骨肌肌电图（EMG）活动的影响。样本包括40名健康受试者，其中20名具有双侧尖牙引导，20名具有双侧组牙功能。使用表面电极记录左侧上、下颌舌骨肌的积分肌电图（IEMG）活动，记录时段包括：（1）从牙尖交错位磨至侧方边缘对边缘接触位（采用尖牙引导或组牙功能）；（2）在侧方边缘对边缘接触位进行静态紧咬，采用尖牙引导或组牙功能；（3）从侧方边缘对边缘接触位（采用尖牙引导或组牙功能）磨至牙尖交错位。上、下颌舌骨肌的IEMG活动在尖牙引导或组牙功能情况下无显著差异。情况2中的上、下颌舌骨肌IEMG活动显著高于情况3，情况3又显著高于情况1。上、下颌舌骨肌IEMG活动在尖牙引导和组牙功能方面无显著差异。静态记录（紧咬）期间的上、下颌舌骨肌IEMG活动显著高于动态记录（磨耗）期间。从侧方边缘对边缘接触位磨至牙尖交错位期间的活动高于相反过程。
