The purpose of this study was to investigate the functional property of the inferior head of lateral pterygoid muscle (ILP) in jaw movements. Electromyographic recordings (EMG) of bilateral ILP were obtained intraorally by using bipolar fine wire electrodes. In addition, surface electrodes were used on the posterior temporal muscles and the other 4 muscles. Jaw movement data were taken by the 6 degree of freedom digital jaw tracking device (MM-JI). Both EMG and jaw movement were recorded simultaneously in 8 subjects. The results were as follows.

The purpose of this study was to establish the diagnostic parameters on stomatognathic function with the six degrees of freedom jaw movement data in 15 male subjects. All subjects, in the range of 24 to 44 years of age, had full dentition and were without symptomatic TM disorders. Diagnostic parameters were selected for the range, velocity, acceleration, etc of jaw movement. The results suggested that jaw movement data have diagnostic value for the stomatognathic function.

No abstract