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KMID : 0896020100400030131
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Korean Journal of Oral and Maxillofacial Radiology
2010 Volume.40 No. 3 p.131 ~ p.135
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The timing of tooth eruption and root development of permanent canine and premolars in Korean children
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Cheong Chang-Shin
Jung Yun-Hoa
Cho Bong-Hae
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Abstract
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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.
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.
Conclusions: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.
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KEYWORD
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Tooth eruption, Tooth calcification, Dentition, Permanent
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