Korean J Oral Maxillofac Radiol.  2010 Sep;40(3):131-135.

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

• Cheong CS
• Jung YH
• Cho BH

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.

Keyword

Tooth eruption; Tooth calcification; Dentition, Permanent

MeSH Terms

Aged
Bicuspid
Child
Dentition, Permanent
Female
Humans
Male
Mandible
Maxilla
Tooth
Tooth Calcification
Tooth Eruption
Tooth Root