The masseter motor-evoked potential after transcranial magnetic stimulation in patients with sleep bruxism

VernacularTitle:经颅磁刺激对夜磨牙患者咬肌运动诱发电位的研究
Author: Yuhan SONG ; Huang HUANG ; Jijun WANG ; Qian GUO ; Weicai LIU
Publication Type:Journal Article
Keywords: Masseter motor evoked potential(MEP); Transcranial magnetic stimulation(TMS); Sleep bruxism(SB)
From: Journal of Practical Stomatology 2014;(5):645-648
CountryChina
Language:Chinese
Abstract: Objective:To study the masseter motor evoked potential(MEP)in patients with sleep bruxism(SB)and in healthy con-trols.Methods:30 subjects with SB and 30 healthy controls were included.MEPs were obtained by transcranial magnetic stimulation (TMS).Tests were done during daytime when the subjects were awake.The data were statistically analysed.Results:In the patients AMT was 55(52,55)%,latency of c-MEP (6.7 ±1.3)ms,the amplitude of c-MEP 0.19(0.15,0.29)mV,latency of r-MEP (2.3 ±0.4)ms,the central conduction time(CCT)4.4(3.3,5.2)ms.In the control subjects AMT was 52(52,55)%,latency of c-MEP (6.4 ±0.7)ms,the amplitude of c-MEP 0.23(0.17,0.28)mV,latency of r-MEP (2.4 ±0.4)ms,CCT 4.0 (3.4,4.4) ms.No significant difference was found between the 2 groups in the measurements evoked by TMS.Conclusion:The MEP after TMS in patients with SB is similar to that of healthy subjects,indicating that the excitability of the cortical motor system is not changed in bruxism subjects,at least when evaluated by TMS.