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Electromyography(EMG), one of the earlest neurophysiological diagnostic tool, is a important technique on dental research and dental practice. In this review, physiological principles underlying EMG and the origin of EMG are discussed. I discuss many of problems affecting interpretation, including normalization, processing of EMG signals. Various EMG methods are also presented and their principles are discussed. The EMGs recorded with surface electrodes are usually more susceptible to artifacts than those did with intramuscular electordes. It is possible, however, to make useful recording with the surface electrtode from large superficial muscle if appropriate precautions are observed. Intramuscular electrodes may be preferred for recording the activity from small peripheral muscles or muscles located deep within the body. In temporomandibular dysfunction patients, EMG is useful for evaluation of treatment as well as diagnosis.
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