抄録
The purpose of this study was to investigate the kinesiological regulation of mandibular motor system.
Nine healthy participants were instructed to do rhythmical jaw tapping movement at the opening distance of 1-2, 5, 10, 15, 20, 30 mm, Maximun, and adlib.
The results were as follows:
1. Visual feed-back caused the regulation of the opening distances. The effect persisted more than 30 sec after the feed-back training.
2. Mean closing velocity was most significantly varied with various opening distances. Mean opening velocity, cycle time, and appearance rate of plateau phase were also significantly influenced by them.
3. Cycle time was constant within the ranges of opening distances of 1-2 mm to 5 mm and of 10 mm to 20 mm.
4. As the opening distance increased, mean closing velocity and opening velocity significantly became faster, and the adjustable range of the former was wider than the latter.
5. The appearance rates of the plateau phase at 30 mm- and maximum-opening tappings were higher than those at 1-2 mm-and adlib-tappings.
6. The above results suggested that the regulating mechanism of jaw tappings with constant opening distance would consist of the layered regulation system, which would make the duration of tooth contact phase fixed and cycle time constant.
