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Orthopantomography에 의한 영구치 치관 석회화에 관한 연구 A Study on Calcification of Crown of Rermanent Tooth by Orthopantomography

대한치과의사협회지 1973년 11권 12호 p.787 ~ 799
조사현,
소속 상세정보
조사현 ( Cho Sa-Hyun ) 
서울대학교 치과대학 소아치과학교실

Abstract


Surveying the calcification degree of permanent tooth crown in 719 Korean children (Male 387, female 332) from 2 to 10 years old by orthopantomograph, the author got the following results. 1. Female was earlier than male in calcification of permanent teeth. 2. The results of the complete calcification of the permanent tooth crown were as follows. 3. The completion of calcification in the mandibular crown was seen earlier than that of the maxilla. 4. The order of calcification in permanent tooth crowns was as follows : 1 st molar, central incisor, lateral incisor, canine, 1st premolar, 2nd premolar, and 2nd molar. 5. The completion of calcification of the permanent crowns in Korean children was slightly retarded comparing with the Japanese and the American children.

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