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Muscle forces during jaw close–open movement. Force (N) of masticatory muscles as a function of time (ms). (A) Jaw closers. (B) Lateral pterygoids and jaw openers. Forces of left and right muscles were identical. Start closing movement: t = 50, jaw closed: t = 150, start opening movement: t = 200. Wide and narrow hatchings: jaw closed and open, respectively. Muscle notations as in Fig. 1.
