Excitatory reflex response of contralateral temporal muscle evoked by mechanical stimulation at human maxillary canine.
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The purpose of this study is to investigate the role of periodontal sensation in the regulation of human masticatory movement, particularly during lateral jaw movement from the working side to the intercuspal position. For this purpose, the responses of motor units of temporal muscle from 4 subjects to mechanical stimulation of the maxillary canine on the working side were analysed. To stimulate the periodontal ligament, the linguo-labially directed pressure was provided to the maxillary canine.The activities of the motor units which spontaneously discharged were delivered by needle electrode from anterior part of temporal muscle. While the canine was being stimulated, mandibular position was kept to the lateral side approximately 2mm by using incisal point as reference point. This mandibular position measured by MKG was visually feedbacked by the subjects.<BR>The results were as follows:<BR>The excitatory response of the contralateral temporal muscle to tonic mechanical stimulation of the maxillary canine on the working side was observed.The contralateral temporal muscle responded much more clearly than the ipsilateral temporal muscle did.<BR>After the sensation of periodontal ligament was blocked by 2% Xylocaine apical infiltration and intraligamental injection, the contralateral temporal muscle gradually showed less response. Therefore, it was proven that the periodontal sensation induced this contralateral temporal muscle response.<BR>During gum-chewing, the activity of these motor units was observed, particularly during lateral jaw movement from the working side to the intercuspal position. Therefore, it was proven that these motor units participated in masticatory movement.<BR>From these obtained results, it suggested that periodontal sensation of the maxillary canine on the working side controlled the activity of the contralateral temporal muscle and took part in the regulation of the human masticatory movement pathway, particularly during lateral jaw movement from the working side to the intercuspal position.
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