SITE LINK

하악제2대구치 치근 발육에 관한 X-선학적 연구
ROENTGENOGRAPHIC STUDIES ON THE DEVELOPMENT OF ROOTS OF MANDIBULAR SECOND MOLARS

치과방사선 1971년 1권 1호 p.13 ~ 19

조정현,

소속 상세정보

조정현 ( Cho Jung-Hyun ) - 서울대학교 치의학대학원 치과방사선학

KMID : 0378219710010010013

Abstract

The author has studied on 910 roentgenograms of lower second molars, which were taken by intraoral technic, and obtained the following results. 1. The development of crown of lower second molars was completed 8.25 years. 2. The formation of mesial and distal roots in full length on lower second molars was completed as follows: a. mesial roots 15. 07 years b. distal roots 15. 53 years 3. The formation of apical foramina of mesial and distal roots of lower second molars was closured as follows: a. apical foramen of mesial root 18.00 years b. apical foramen of distal root 18.79 years 4. As a general rule, the mesial roots were developed more earlier than distal roots.