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Purpose: The purpose of this study was to investigate the effect of loss of posterior occlusal support on the stabilization of posture stance disturbed by electrical stimulation. Methods: Experiments were performed on 15 young healthy adults (aged 26.3±3.1; mean ± SD). The subjects stood on a force plate with eyes open and in the upright position. The common peroneal nerve of the right leg was stimulated randomly by supramaximal percutaneous electrical stimulation once every 8 to 10 s to contract their peroneus longus and tibialis anterior muscles involuntarily. We analyzed the total length, anterior/posterior and lateral amplitude of body sway under the following three occlusal conditions: mandibular rest position (Control), maximum voluntary teeth clenching with splint covering only anterior teeth (AntSP-CL), and maximum voluntary teeth clenching (CL). Results: The total length (p<0.01) and anterior/posterior amplitude of body sway (p<0.05) under the CL condition were significantly lower than those under the Control condition. The total length of body sway and anterior/posterior amplitude under the AntSP-CL condition did not show statistical differences compared with the Control and CL (one-way ANOVA, Bonferroni correction method). Conclusions: It is suggested that occlusal supports of molar teeth would contribute to postural adaptation caused by teeth clenching to a novel environment. Accordingly, we consider that they would play an important role in not only masticatory function but also motor function.

Effect of bilateral loss of posterior occlusal support on the stabilization of posture stance disturbed by electrical stimulation