Shiau Y Y, Syu J Z
School of Dentistry, National Taiwan University, Taipei.
J Oral Rehabil. 1995 Feb;22(2):145-51. doi: 10.1111/j.1365-2842.1995.tb00248.x.
The effect of working interference on 13 bruxers and 14 non-bruxers was studied by applying a metal overlay on the buccal cusps of the adjacent upper premolar and molar. The pattern and velocity of cyclic movement during gum chewing before and after overlay insertion were observed. EMG of the temporalis and masseter muscles were recorded bilaterally during the chewing movement. It was found that after insertion, one of the non-bruxers complained of pain in the muscles, while such a complaint was not found in bruxers. Bruxing habit was reported to be less or eliminated in 44% of the bruxers, but no non-bruxers became bruxers. The closing velocity was more often decreased immediately after overlay insertion, and the closing path near the occlusal phase was significantly narrower, with patterns of over-extension and avoidance before reaching the occlusal phase. The delayed effects were a more vertically oriented chewing cycle without over-extended closing movement, and an unretarded chewing velocity. It was concluded that within the experimental period a working side interference was tolerable in most of the subjects studied with or without a bruxing habit.
通过在相邻上颌前磨牙和磨牙的颊尖上施加金属覆盖物，研究了工作干扰对13名磨牙症患者和14名非磨牙症患者的影响。观察了覆盖物插入前后咀嚼口香糖期间的循环运动模式和速度。在咀嚼运动期间双侧记录颞肌和咬肌的肌电图。结果发现，插入后，一名非磨牙症患者抱怨肌肉疼痛，而磨牙症患者未出现此类抱怨。据报道，44%的磨牙症患者磨牙习惯减轻或消除，但没有非磨牙症患者变成磨牙症患者。覆盖物插入后，闭合速度更常立即降低，咬合阶段附近的闭合路径明显变窄，在达到咬合阶段之前有过度伸展和回避模式。延迟效应是咀嚼周期更垂直定向，没有过度伸展的闭合运动，以及咀嚼速度没有减慢。得出的结论是，在实验期内，对于大多数有或没有磨牙习惯的研究对象来说，工作侧干扰是可以耐受的。
