[Relation between articulatory function and prosthesis. II-1. Longitudinal changing aspect of experimental palatal plate on muscular discharge of intrinsic muscles, tongue movement and mandibular movement before pronunciation].

As the first step of evaluating the kinematic function and the coordinative movement among articulatory organs, attention was focused on the palatal form in various factors related to the function of pronunciation on complete denture. After the experimental palatal plate was inserted into 13 natural dentitions in the age ranging from 21-24 years old, muscular discharge of intrinsic muscles, tongue movement and mandibular movement before pronunciation were recorded longitudinally. These data were comparatively evaluated with those before insertion of the experimental palatal plate, and the following conclusion were obtained. It has been made clear in this study that from the change of muscular discharge of intrinsic muscles, tongue movement and mandibular movement before pronunciation between before and after the insertion of the experimental palatal plate, correction aspect of the kinematic function and the coordinative movement among articulatory organs varied with point and method of articulation on each sound. And these facts suggested that it was necessary to diagnose and treat under consideration of the relation between the palatal form and articulatory function of tongue and mandible in removable prosthodontic treatment.