Influence of alterd anterior guidance on the activity of the masticatory muscles.
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概要
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It is important to reconstruct occlusion with appropriate anterior guidance through prosthetic treatment. The present study examined the influence of altered anterior guidance on the activity of the masseter and the posterior temporal muscles. Three adult subjects without any symptoms of mandibular dysfunction and with unilateral balancing molar contact caused by edge-to-edge or anterior open-bite occlusions were used. EMG and mandibular movement recordings were performed for each subject without (G0) and with metal artificial copings which were adjusted to the angles of the incisal paths of the same (G1), plus 10 degrees (G2) and plus 20 degrees (G3) ; the copings were attached to both sides of the maxillary canines. G2 and G3 copings eliminated the unilateral balancing molar contact.<BR>During lateral sliding movement, G1 copings caused various changes on EMG activity. Compared with G0 and G1, 02 copings tended to cause a reduction of EMG activity from the intercuspal position to the lateral side and to cause an increase of EMG activity when returning to the intercuspal position. Compared with G2, G3 copings tended to cause a reduction of EMG activity. Altered anterior guidance was more effective on EMG activity during lateral sliding movement than that during mastication of gum chewing. Masticatory rhythm did not show significant change. Unilateral balancing molar contact on the contralateral side may affect the stability of masticatory rhythm and chewing stroke.
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