To develop a more convenient electromyography (EMG) signal acquisition system for masticatory muscles (MMs) will have implication for the diagnosis of disease of stomatological system and functional reconstruction in dentistry. This study attempted to design a multi-channel MM surface electromyography (s-EMG) signal acquisition system which has high common mode rejection ratio (CMRR) and preamplifier system. In this system, a USB graphical interface technology on windows operating system was specifically designed and s-EMG data were analyzed by a combination of time domain, frequency domain, time-frequency, several spectral analysis, wavelets and other special algorithms under multi-parameter. Then the EMG data from some patients with stomatological dysfunction in temporomandibular joint (TMJ) clinic and a control group from dental school students were acquired and analyzed. The data indicate that the s-EMG signal acquisition system which has been built is simple and useful in aiding diagnosis and treatment evaluation of temporomandibular disorders.

The aim of this study was to design a simple,economic,with high Common Mode Rejection Ratio(CMRR),preamplifier and multi-channel masticatory muscle surface electromyography(sEMG)signal acquisition system assisting to diagnose temporomandibular disorders(TMD).We used the USB interface technology in the EMG data with the aid of the windows to operate system and graphical interface.Eight patients with TMD and eight controls were analyzed separately using this system.In this system,we analyzed sEMG by an optional combination of time domain,frequency domain,time-frequency,several spectral analysis,wavelets and other special algorithms under multi-parameter.Multi-channel sEMG System of Masticatory Muscles is a simple,economic system.It has high sensitivity and specificity.The sEMG signals were changed in patients with TMD.The system would pave the way for diagnosis TMD and help us to assess the treatment effect.A novel and objective method is provided for diagnosis and treatment of oral-maxillofacial disease and functional reconstruction.