Myo-monitor 刺激による下顎位の変動について
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概要
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In order to clarify the stimulating characteristics and their effects of a Myo-monitor and to investigate the mandibular position, 10 normal and 5 edentulous subjects without stomatognathic symptoms were studied. After examination of the direct output pulse and percutaneous pulse, the Myo-monitor was used according to the instruction manual. The evoked EMG was recorded from anterior portion of the temporal, the masseter, anterior venter of the digastric, the orbicularis oris and the buccinator muscles. Mandibular movement was recorded with a pin-pointed miniature lamp luminograph in three dimensions. The results obtained were as follows : 1. The Myo-monitor employed was a kind of constant voltage device and the stimulation was made with a common cathode stimulation method. 2. The duration of the stimulating pulse was about 1 msec which generating every 1.5 second. In the dial 2 and 4 of the overclosure scale, 4 and 8 pulses of about 1 msec duration were delivered at 10 msec intervals in groups with the same intensity and frequency of the single pulse. 3. The stimulating intensity of the percutaneous pulse on the subject was gradually increased from 1 to 10 in amplitude scale. 4. Following the investigation of evoked EMG, it was clarified that the Myo-monitor pulse stimulates the nerve trunks of the V th and VII th cranial nerves at the superior mandibular notch percutaneously and it appeared to have afferent and efferent effects. 5. The maxillomandibular relationship during the Myo-monitor stimulation (myocentric) in nor-mat subjects coincided with centric occlusion (habitual occlusion) in 7 out of 10 subjects and threeshowed a slightly posterior position (0.2〜0.4mm) from centric occlusion, but anterior from centricrelation (retruded position or terminal hinge position). In edentulous subjects without upper denture, the vertical movement distance of the mandible was gradually increased following increased stimulating intensity showing individual maximum values between 4.6 mm and 7.2 mm. 6. The mandibular position during the pause of stimuli, both in normal and edentulous subjects, was constantly stable in a range of clinical rest position.
- 日本補綴歯科学会の論文
- 1973-06-30