Influence of Mouthgard on Masticatory Muscle Activities on the Body Exercise

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Generally, although the mandible is considered to be fixed during body movement, its dynamics have not been clarified. In this study, we investigated the condylar movement pattern in extension/flexion movement of the body trunk. healthy dentulous subjects performed extension/flexion movement of the body trunk using a multipurpose muscle function training system. The condylar and incisal point movement patterns were measured using a jaw movement analyzer and 3D ultrasonic navigator. The maximum displacements of the condylar and incisal points in mouth opening were measured. The relative percentages of the condylar point displacements in extension/flexion of the body trunk to the maximum displacements were calculated, and displacements in the anterior, and posterior, superior, and inferior directions were compared. Based on the above findings, the mandible is not fixed at the intercuspal position by clenching, but displaced during muscle force exertion by the body trunk.