A study on growth changes of maxilla and mandible and position changes of first permanent molars of growing children / 대한치과교정학회지

ABSTRACT

The purpose of this study was to investigate the growth changes of maxilla and mandible and position changes of first permanent molars of growing children. The author analyzed the data using cephalometric roentgenogram of 43 boys and 39 girls age of 6 to 11 with normal occlusion. The obtained results were as follows 1. The eruption path of maxillary and mandibular first permanent molar superimposed on TM-ANS and mandibular plane shows individual variation. 2. There was no correlation between horizontal and vertical changes of maxillary first permanent molar, but positive correlation in mandibular first permanent molar. 3. As the eruption, the forward changes of mandibular first permanent molar was significantly greater than that of maxillary first permanent molar. 4. As the ages were increased, there were irregular growth changes of maxilla and mandible. 5. Growth changes of lower anterior facial height was relatively stable. 6. N-S-6 was stable after age 7.