Abstract
The purpose of this study was to ascertain the relationship between the development of the stomatognathic system and the changing of the mandibular movement.
The subjects consisted of 48 children without functional disorders of the stomatognathic system and were divided into groups from IIA to IIIC according to Hellman's dental stages.
The Saphon Visi-Trainer was used as the analytic method. The mandibular border movement at the mandibular incisor was recorded using the Saphon Visi-Trainer Model 3, and was examined as to how it changed according to the progress of Hellman's dental stage.
As a result, the following findings were obtained:
1. According to the progress of Hellman's dental stage, the mandibular border movement was enlarged towards the anterior, exterior, inferior and posterior.
2. Changing of the right and left maximal lateral occlusal positions of the mandible corresponding to the progress of Hellman's dental stage tended toward symmetry.
3. Corresponding to the Hellman's dental stage, the paths of the protrusive and lateral gliding movements moved downward and showed downward convex curved lines.
