al-Quran F A, Lyons M F
Dental School, University of Glasgow, UK.
J Oral Rehabil. 1999 Jul;26(7):559-63. doi: 10.1046/j.1365-2842.1999.00421.x.
The aim of this study was to compare the effects of hard and soft splints on the activity of the anterior temporalis and masseter muscles. Surface EMG recordings were made from these muscles during clenching at 10% of maximum, 50% of maximum and at maximum clench, both before and after insertion of a hard splint. This sequence was then repeated with a soft splint. The relative level of activity in the anterior temporalis and masseter muscles at all three activity levels was quantified by means of an Activity Index, which provides a measure of the balance of activity in the masseter relative to the activity in the anterior temporalis muscle. It was found that hard splints led to a decrease in EMG activity in relation to activity with no splint in both muscles at maximum clench and particularly the anterior temporalis. Soft splints produced a slight increase in activity of both muscles, but particularly the masseter muscle. The Activity Index indicated a shift in the balance of activity away from the anterior temporalis muscles with both splints, particularly at 10% of the maximum clenching level. It is possible that the decrease in activity of the temporalis muscles relative to the masseter muscles may be a factor in the therapeutic effect of both a hard and a soft splint, although the decrease is clearly greater with the hard splint.
本研究的目的是比较硬夹板和软夹板对颞肌前束和咬肌活动的影响。在佩戴硬夹板前后，于最大 clenching 力的 10%、50%以及最大 clenching 力时，从这些肌肉进行表面肌电图记录。然后用软夹板重复此过程。通过活动指数对颞肌前束和咬肌在所有三个活动水平下的相对活动水平进行量化，该指数提供了咬肌活动相对于颞肌前束活动的平衡度量。结果发现，在最大 clenching 力时，硬夹板导致两块肌肉的肌电图活动相对于不使用夹板时均有所下降，尤其是颞肌前束。软夹板使两块肌肉的活动略有增加，但尤其是咬肌。活动指数表明，使用两种夹板时，活动平衡均从颞肌前束转移，特别是在最大 clenching 力的 10%水平时。颞肌相对于咬肌活动的降低可能是硬夹板和软夹板治疗效果的一个因素，尽管硬夹板导致的降低明显更大。
