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THE ROEHTGENOGRAPHIC STUDY OF THE RELATIONSHIP BETWEEN ERUPTION AND CALCIFICATION OF THE MANDIBULAR PERMANENT TEETH IN KOREAN.

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±è¼øÁÖ(ÐÝâïñº)/Soon Joo Kim ÀÌÁ¾°©(×Ýñ£Ë£)/Jong Gap Lee

Abstract

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2¼Ò±¸Ä¡ÀÇ ¼ø¼­¿´´Ù.
#ÃÊ·Ï#
The purpose of this study was to finding out the relationship between the tooth
calcification and eruption of the mandibular permanent teeth in Korean.
This study was undertaken in 592 children at ages from 3 to 13 years who had good
oral condition by means of panoramic roentgenographic analysis.
The following results were obtained.
1. The mean ages of crown completion were as follows:
Canine 1st. Premolar 2nd. Premolar 1st. Molar
Male 6yrs. 4mos. 6yrs. 8mos. 7yrs. 6mos. 3yrs. 10mos.
Female 5yrs. 11mos. 6yrs. 5mos. 7yrs. 2mos. 3yrs. 3mos.
2. Each tooth started to move toward occlusion at approximately stage 6 or after
crown completion.
3. The highest increment in eruption rate was at about 1/3¡­l/2 completion of root and
age at 10-11 years in male, 9-10 years in female.
4. Eruption period of both sexes were as follows;
Canine: 6-12years
1st. Premolar: 7-12 years
2nd. Premolar: 7-13 years
1st. Molar: 3-7 years
5. The eruption was completed before the root completion.
6. The sequence of eruption and calcification was 1st. Molar-Canine-lst. Premolar-2nd.
Premolar in both sexes.

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