抄録
The purpose of this study is to reveal the relation between stomatognathic system and the systemic condition.
In the present study, experimental occlusal interference was given to the first molar on main mastication side of 6 healthy subjects and the influence on the upright posture was evaluated through simultaneous measurements of changes in activity of antigravity muscles via electromyography, other than the measurement of loci of the gravity fluctuation for stabilograph before and after the interference was provided.
The following results were obtained,
1. Loci of gravity fluctuation
1) All parameters tended increase 24 hours after the interference was provided.
2) The decreasing trend was noted 24 hours after the interference was removed.
3) At one week after the interference was removed all analysis items tended to restore to the normal range.
2. Activity of antigravity muscles In some of the subjects, the muscular activity showed the same trend as the changes of analysis items of gravity fluctuation.
3. The above results suggest that the evaluation of the loci of the gravity fluctuation may be helpful to assess the therapeutic effect of malocclusion.
