Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)

Korean Academy of Pediatric Dentistry (대한소아치과학회)
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Estimation of Mandibular Third Molar Development Using the Correlation in Dental Developmental Stages

치아 발육 단계의 상관관계를 이용한 하악 제3대구치 발육 평가

  • Junyoung Kim (Department of Pediatric Dentistry, School of Dentistry, Seoul National University) ;
  • Hyuntae Kim (Department of Pediatric Dentistry, School of Dentistry, Seoul National University) ;
  • Teo Jeon Shin (Department of Pediatric Dentistry, School of Dentistry, Seoul National University) ;
  • Hong-Keun Hyun (Department of Pediatric Dentistry, School of Dentistry, Seoul National University) ;
  • Young-Jae Kim (Department of Pediatric Dentistry, School of Dentistry, Seoul National University) ;
  • Jung-Wook Kim (Department of Pediatric Dentistry, School of Dentistry, Seoul National University) ;
  • Ki-Taeg Jang (Department of Pediatric Dentistry, School of Dentistry, Seoul National University) ;
  • Ji-Soo Song (Department of Pediatric Dentistry, School of Dentistry, Seoul National University)
  • 김준영 (서울대학교 치과대학 소아치과학교실) ;
  • 김현태 (서울대학교 치과대학 소아치과학교실) ;
  • 신터전 (서울대학교 치과대학 소아치과학교실) ;
  • 현홍근 (서울대학교 치과대학 소아치과학교실) ;
  • 김영재 (서울대학교 치과대학 소아치과학교실) ;
  • 김정욱 (서울대학교 치과대학 소아치과학교실) ;
  • 장기택 (서울대학교 치과대학 소아치과학교실) ;
  • 송지수 (서울대학교 치과대학 소아치과학교실)
  • Received : 2023.06.29
  • Accepted : 2023.08.10
  • Published : 2023.11.30
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Abstract

This study aims to confirm the average chronologic age according to the developmental stages of the mandibular canine (L3), first and second premolars (L4, L5), and second and third molars (L7, L8) in children and adolescents, and to confirm the developmental stage of L3, L4, L5, and L7, which can estimate the development of L8. A total of 1,956 digital panoramic radiographs of healthy individuals aged between 6 and 15 years who visited Seoul National University Dental Hospital from January 2019 to December 2020 were selected. The developmental stages of L3, L4, L5, L7, and L8 on both sides were evaluated using the dental maturity scoring system proposed by Demirjian and Goldstein. The average age at which the follicle of L8 was first observed was around 9.34 ± 1.35 years and varied from 6 to 12 years. The possibility of agenesis of L8 was high when no traces of L8 were observed after the following stages: L3, L4, and L5 at the developmental stage F and L7 at the developmental stage E; the age was about 10 years. In estimating the development of L8, when only one tooth was considered, estimation accuracy with L5 was the highest, and there was no significant difference when all four teeth were included. This study showed the age distribution according to the developmental stages of L3, L4, L5, L7, and L8 in children and adolescents and confirmed the developmental stages of L3, L4, L5, and L7, which can be used to estimate the development of L8.

이 연구의 목적은 소아 청소년의 하악 견치, 제1, 2소구치, 제2, 3대구치의 발육 단계별 평균 연령을 확인하고, 이를 토대로 하악 제3대구치의 발생 유무를 추정할 수 있는 하악 견치, 제1, 2소구치, 제2대구치의 발육 단계를 확인하는 것이다. 2019년 1월부터 2020년 12월까지 서울대학교치과병원에 내원한 만 6 - 15세 사이의 건강한 환자의 1,956개의 파노라마 방사선 사진을 이용하여, Demirjian과 Goldstein의 방법으로 양측 하악 견치, 제1, 2소구치, 제2, 3대구치의 치아 발육 단계를 평가하였다. 제3대구치의 치배가 처음 관찰되는 연령은 평균 9.34 ± 1.35세였고, 6세부터 12세에 걸쳐 다양하게 나타났다. 하악 견치, 제1, 2소구치가 F단계, 제2대구치가 E단계 이후에도, 제3대구치가 관찰되지 않으면 제3대구치의 결손 가능성이 높은 것으로 나타났으며 그 연령은 평균 10세였다. 제3대구치의 발육 여부를 추정할 때 치아 하나만을 고려한다면 제2소구치와의 추정 부합도가 가장 높았으며 4개 치아 전부를 포함했을 때와 큰 차이가 없었다.이번 연구를 통해 만 6세에서 15세 사이의 소아 청소년에서 하악 견치, 제1, 2소구치, 제2대구치의 발육 단계별 연령 분포를 확인할 수 있었으며, 이를 근거로 하악 제3대구치의 발육 여부를 평가할 수 있는 하악 견치, 제1, 2소구치, 제2대구치의 발육 단계를 확인할 수 있었다.

Keywords

Acknowledgement

This study was supported by grant no 02-2021-0137 from the Seoul National University Dental Hospital Research Fund, Seoul, Republic of Korea.

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