The effect of bruxism on periodontal function

磨牙症患者的牙周感觉和牙齿移位可能与非磨牙者不同，因为夜间可能会对牙齿施加过量的ocdusal力。为探讨磨牙症对磨牙区牙周感觉及牙齿移位的影响，将14名受试者分为磨牙症组（n=7）和非磨牙症组（n=7）。磨牙症是根据夜间咬肌肌电活动来确定的。牙周感觉的评估是基于牙弓间触觉阈值，这是指可以检测到的牙齿的咬合面之间的最小厚度。通过随机放置金属箔，在左侧和右侧的第一磨牙区域中测量牙弓间触觉阈值，并且在3个不同的日子中每天测量两次（上午和下午）。对磨牙症（有或无）进行多变量方差分析作为受试者间效应，对一天中的时间（上午和下午）和侧（左侧和右侧）进行多变量方差分析作为受试者内效应（α= 0.05）。多变量方差分析显示，两组中上午和下午或左侧和右侧之间的齿间触觉阈值无显著差异。磨牙者的牙弓间触觉阈值为（17.1 ± 3.9）μm，而非磨牙者的牙弓间触觉阈值为（29.9 ± 5.6）μm（P<0.01），磨牙者的牙周感觉明显高于非磨牙者。应用二维牙齿位移传感器测量上颌第一磨牙移动量。对于磨牙者和非磨牙者，牙齿位移的方向没有差异。与非磨牙者相比，磨牙者的位移量有较大的趋势。

Periodontal sensation and tooth displacement in individuals with bruxism may differ from those in non-bruxers, as excessive amounts of ocdusal force may be applied to the teeth during the night. The purpose of this study was to investigate the effects of bruxism on periodontal sensation in the molar region and tooth displacement.Fourteen subjects were divided into the non-bruxers (n=7) and the bruxers (n=7). Bruxism was confirmed based on the nocturnal electromyography activities of the masseter musde. Periodontal sensation was assessed based on interocdusal tactile threshold, which refers to the minimal thickness that can be detected between the occlusal surfaces of the teeth. Interocdusal tactile threshold was measured in the first molar region each for the left and right sides by randomly placing metal foils, and was measured twice daily (morning and afternoon) on 3 separate days. Multivariate analysis of variance was performed for bruxism (with or without) as a between-subjects effect, and time of day (morning and afternoon) and side (left and right) as within-subjects effects (α=.05) Multivariate analysis of variance revealed no significant differences in interocdusal tactile threshold between morning and afternoon or between the left and right sides in either group. Mean interocdusal tactile threshold for the bruxers was 17.1 ± 3.9 μm, while that for the non-bruxers was significantly greater at 29.9 ± 5.6 μm (P<001).The periodontal sensation in bruxers was increased compared to non-bruxers.Six subjects were divided into the non-bruxers (n=3) and the bruxers (n=3). Tooth displacement during denching were measured in the maxillary first molar using two dimensional tooth displacement transducer. For both the bruxers and non-bruxers, there were no differences in the direction of tooth displacement. When compared with the non-bruxers, the amount of displacement was tend to be higher in the bruxers.