Relationship between body balance and bite rising

Method: Twenty-five members of the Japan self defense force (JSDF) (mean age : 25.6±3.5) were checked up their physical and dental condition prior to this study. Before starting this examination, two pieces of custom-made sprint were prepared for every member. These sprints were designed for keeping 3 and 7millimeter bite rising at the first molars and made of heat shocked resin. The way of making the sprint was same process for ordinary denture. The two types of sprints which had difference thickness were distributed to the member. Then the static and dynamic body balances when they wear the sprint or not were measured by TG and LB. On the measurement of body balances, they were required to keep stand at attention (60sec.) on the instrument for the measure of static body balance and to continue squat motion (60sec.) and right-about-face (15sec.) for the measure of dynamic body balance. These data were classified into eight measurement items, Total length (TL)(cm), Total length per second (TL/s)(cm/sec),Envelop area(EA) (cm²), Root mean square area(RA) (cm²), Length of X and Y direction (LX), (LY) (cm), Maximum amplitude of X and Y direction (MX), (MY) (cm). Result: The results of the examination showed clear change in their body balance when they wore the sprints. In the static balance, TL TL/s and RA indicated significant decrease in wearing the sprints. (P<0.01) In the dynamic body balance as squat motion, (EA),(RA),(MY) showed significant difference between no wear(40.9±14.7), (20.4±7.8), (11.9±3.05) and wear the 3mm thick sprint (38.4±12.7), (18.7±7.3), (11.0±2.6),7mm thick (35.8±13.0) (17.5±6.9) (10.8±2.8). (P<0.05) In right-about-face, all measurement items except (EA), (MX) indicated significant difference between two conditions. (P<0.01, P<0.05) Conclusion: The result of this study indicated significant relationships between body balance and bite rising. This evidence showed close relationship between bite rising and posture control of human body.