摘要
目的研究平面导板辅助固定矫治器治疗重度深覆患者的早期,平面导板戴入后患者的颞肌前束(TA)和咬肌(MM)在静息状态下的肌电活动变化,探讨平面导板戴用过程中咬合垂直距离的最佳升高距离。方法选择重度深覆患者36例,随机分为D、D+2和D+4共3个试验组,戴入平面导板后的咬合升高距离分别为息止间隙、息止间隙加2mm、息止间隙加4mm。另外选择34例个别正常个体作为对照组。利用肌电仪分析试验组患者治疗前和戴入平面导板2周后TA、MM在静息状态下的肌电活动变化,并与对照组作比较。结果治疗前,试验组的肌电值明显高于对照组(P<0.05)。平面导板戴用2周后,所有试验组患者TA、MM的肌电值较治疗前均明显降低(P<0.05);D+2和D+4组的降低幅度明显大于D组,而D+2和D+4组的降低幅度则无统计学差异(P>0.05)。结论平面导板戴入后,咬合垂直距离升高幅度超过息止间隙,对重度深覆患者咀嚼肌的功能恢复较为有利。
Objective To analyze changes of myoelectrical activity of anterior funicle of temporal muscle （TA） and masseter muscle （MM） after raising vertical distance of occlusion by flat bite plate during treatment of deep overbite in order to approach an optimal raised vertical distance. Methods A total of 70 persons were selected and divided into two groups： Experiment group （36 patients） with deep overbite and control group （34 persons） with individual normal occlusion. The experiment group was subdivided into three groups that were respectively raised D, D＋2 mm and D＋4 mm （D means free way space, mm）. Electromyologram （EMG） was utilized to measure the average peak potential of TA and MM on quiescent condition before treatment and two weeks after wearing flat bite plate. Results 1）Before treatment, the average peak potential of experiment group was obviously higher than that of the control group （P〈0.05）. 2）After two weeks the potential of TA and MM of all persons in experiment group was obviously lower than before （P〈0.05）, the degree between the group D＋2 mm and the group D＋4 mm was not manifestly different, but both of the two groups were more obvious than the group D. Conclusion The raised vertical distance of occlusion by flat bite plate, which exceeded free way space, was favourable to the functional recovery of masticatory muscles.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2009年第3期301-304,共4页
West China Journal of Stomatology
