正常者のそしゃく運動経路の安定性に関する研究

Abstract

The purpose of this study was to find the stability of the masticatory movement path in normal subjects. Masticatory movements were measured on 56 normal young adults. The stability of the movement path was calculated as standard deviations of incisal, molar and condylar points at every 10% vertical level on each trajectory.Incisal and molar points:1. The stability of anteroposterior component was higher than that of lateral component. The stability of anteroposterior and lateral components was high near the intercuspal position, and became lower as the gape increased.2. The stability of the closing path (CP) was higher than that of the opening path (OP) at the level of 10-50%. However, the relationship between them was inverted at the level of 70-90%.3. The anteroposterior stability of the working side molar was higher than that of the incisal and non-working side molar points near the intercuspal range.Condylar points:1. The stability of lateral component was higher than that of vertical component, and it changed little as the condylar translation increased. However, the stability of lateral component became lower as the condylar transition increased.2. There was no significant difference in the stability of anteroposterior and lateral components between OP and CP.