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北歐 Denmark의 小兒齒科敎育의 現況

대한소아치과학회지 1976년 3권 1호 p.5 ~ 6
손동수,
소속 상세정보
손동수 (  ) 
서울대학교 치과대학 소아치과학교실

Abstract


The author measured the degree of development and the eruption pattern of first permanent molars with orthopantomography in 553 Korean children(male; 302, female; 251) from 4 to 9 years old. The orthopantomographs were obtained from dept. of pedodontics, college of dentistry, Seoul National University.
The results of the studies were as follows:
1. Upper first permanent molars were erupted with distal´, inclination of about 30 degrees in the early stage and they gradually moved in the menial direction by bodily movement of the tooth to be in contact with the disto-proximal surface of primary- secondary ´molars in the late stage.
2. Lower first permanent molars were erupted with mesial inclination in the early stage and moved mesially by tipping movement of the tooth to be in contact with the disto proximal surface of the second primary molars in the late stage.
3. The eruptive forces were considered to be main etiologic factors of space closure after the premature loss of primary molars.

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