Abstract
Mandibular movement is one of the concrete manifestations of the mandiblestomatic function, and the range of mandibular movement is determined by complex interactions of the muscles, ligaments, nerves and temporomandibular joints, etc. In order to understand the characteristics of mandibular movements shown by young children during growth, the range of mandibular movements in the area of the mandibular incisors was recorded in young children (14 cases) and adults (12 cases) using the specially designed pedodontic mandibular movement recorder, and it was examined and compared on the frontal and sagittal plane projection chart; As a result, the following findings were made.
1. Although the range of mandibular movement was different in size between young children and adults, there was observed no basic difference in the shape on the frontal and sagittal plane projection chart.
2. Young children showed more rectilinear mandibular movements than adults in the protrusive and lateral excursion and in posterior border movement.
3. The ratio of the quantity of maximum lateral and protrusive movement to the maximum jaw opening was smaller in young children than in adults when compared on the frontal and sagittal plane projection chart.