初期 Arch Crowding 豫測에 關한 硏究

• 영문명: A STUDY ON THE PREDICTION OF INCIPIENT ARCH CROWDING IN CHILDREN
• 발행기관: 대한치과교정학회
• 저자명: 張英一(Chang Young Il)
• 간행물 정보: 『The Korean Journal of Orthodontics』제13권 제2호, 205~208쪽, 전체 4쪽
• 주제분류: 의약학 > 기타의약학
• 파일형태: PDF
• 발행일자: 1983.12.31

영문 초록

To study the calcification of second molars in Class I malocclusion with normal craniofacial structure, the author examined cephalograms, orthopantomograms, periapical films of 538 children from 7 y 0 xn to 15y l im old who had Class I malocclusion with normal craniofacial structure, and observed the calcification stage of upper and lower r,Pcond molars. The results are as follows. 1. The mean ages of crown completion of upper and lower second molars are 8.82±1.14, 8.72± 0.75 in boys, and 8.60±1.46, 8.22±0.92 in girls. 2. The mean ages of root completion of upper and lower second molars are 14.25±1.46, 14.15± 0.83 in boys, and 14.12±0.93, 14.15±0.83 in girls. 3. There are no difference between the calcification stages of upper second molars and those of lower second molars in both sexes.