Eruption times and sequence of permanent teeth in 6712 children and young adolescents / 实用口腔医学杂志

ABSTRACT

Objective:To determine the differences of age, eruption sequence and gender of permanent teeth in children and adolescents in Xi'an, China. Methods:Cross-sectional data on permanent teeth eruption were collected from children aged 3~15 in pre-school, primary and secondary school. The subjects were drawn by multistage random sampling from the school registers. There were 6 712 subjects involved in present survey, including 3 604 boys and 3 108 girls. The data were subjected to probit regression analysis. Results:The median age of tooth eruption in girls was earlier than that in boys. Although the range of years during which the permanent teeth erupted was similar in both sexes, i.e. 6~12 years, the sequence of the tooth eruption was differed. All mandibular teeth, with the exception of first and second premolars in both males and females, tended to erupt earlier than their maxillary counterparts. Conclusion:The findings seem to be different from earlier studies done in the other parts of China.