The Relationship between Mandibular Position and Sole Pressure

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  • Satoh Yoshiyasu
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
  • Higashi Kazuo
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
  • Mizumori Takahiro
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
  • Yatani Hirofumi
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry

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Abstract

Purpose: To clarify the effects of deviated mandibular positions on the center of sole pressure in terms of fluctuations and positional changes.<BR>Methods: Of 100 subjects at Osaka University Graduate School of Dentistry, 30 faculty members and students who exhibited no mandibular deviation (i.e., who had a median menton angle and an SNB angle within one standard deviation of the mean) were selected. Using a machine capable of assessing the distribution of sole pressure, the center of sole pressure and the degree of fluctuations in the center of sole pressure corresponding to the mandibular positions, were measured at deviated mandibular positions. The mandible was moved 3 mm in the left, right, or anterior directions and maximally in the posterior direction. The data were analyzed statistically using a paired t test with a significance level of P=0.05.<BR>Results: No tendencies were observed between the positional changes in the center of sole pressure and the mandible moving from the intercuspal position. Whereas the degree of fluctuation increased significantly, irrespective of the direction of change, for the subjects in whom the position of the center of sole pressure did not change, or changed in the same direction as the deviated mandibular position, it did not increase for subjects in whom the position of the center of sole pressure changed in the direction opposite to that of the deviated mandibular position.<BR>Conclusion: The results of this study suggest the possibility that deviated mandibular positions do not affect the positional changes in the center of sole pressure, but do affect the fluctuations in relation to the direction of positional changes.

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