The timing of tooth eruption and root development of permanent canine and premolars in Korean children / 대한구강악안면방사선학회지

ABSTRACT

PURPOSE: The aim of this study was to investigate the timing and sequence of eruption of permanent canine and premolars, and to evaluate tooth calcification stage on emergence in Korean children. MATERIALS AND METHODS: The sample was comprised of 1,266 children (male 720, female 546) aged from 7-13 years. Tooth eruption and calcification stages were determined through oral and panoramic radiographic examination, respectively. Probit analysis was used to calculate the timing of tooth eruption and tooth calcification stage from these cross-sectional data. RESULTS: In both males and females, eruption occurred around the time when one third of tooth root or more was formed. The sequence was as follows first premolar, canine, and second premolar in maxilla, and canine, first premolar and second premolar in mandible. Tooth eruption occurred earlier in girls compared with boys, averaging 0.63 years. CONCLUSION: Eruption sequence is identical in males and females with a trend for females to erupt earlier than males. Tooth eruption becomes earlier over the past decades in Korean children.