Development of evaluating system of bruxism by imaging physiological and biochemical characteristics of masticator muscles.

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1. Regarding to assess the properties of bruxism, we evaluated metabolism, and physiological and biochemical characteristics of masticator muscles using medical imaging. At first, it was evaluated whether a kind of mobilized masticator muscles by the difference of occlusal pattern was judged using MRI. We considered that mobilized masticator muscles could be identified using T2 value.2. We studied whether Doppler ultrasonography presenting blood flow in muscle was useful for evaluating the metabolism of masseter muscle as well as 31P-MR spectroscopy which was performed generally for evaluating metabolism of it as medical imaging. Doppler ultrasonograpy presented findings in correlating to ones of 31P-MR spectroscopy. It was suggested that contraction and recovery from fatigue of the muscle could be evaluated using Doppler ultrasonography, also.3. We evaluated whether change of apparant difussin coeficient (ADC) and T2 value by clenching suggested contraction of masseter muscle. ADC was sensitive to changes by clenching. We suggested that T2 valus and ADCs may be used to evaluated muscle fatigue and injuries that accompany bruxism.4. The aim of this study was to assess whether water diffusion changes could be detected by DT MRI performed at rest, and during jaw opening and closure. The eigen values for diffusion of the MM were sensitive to jaw position. Recruitment of muscle fibers, specific to jaw position, reflects the different changes in muscle diffusion parameters.