Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)

Korean Academy of Pediatric Dentistry (대한소아치과학회)
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Association between Ectopic Eruption of the Maxillary First Permanent Molar and Skeletal Malocclusion

상악 제1대구치의 이소맹출과 골격성 부정교합의 연관성

  • Rah, Yujin (Department of Pediatric Dentistry, College of Dentistry, Wonkwang University) ;
  • Lee, Jewoo (Department of Pediatric Dentistry, College of Dentistry, Wonkwang University) ;
  • Ra, Jiyoung (Department of Pediatric Dentistry, College of Dentistry, Wonkwang University)
  • 나유진 (원광대학교 치과대학 소아치과학교실) ;
  • 이제우 (원광대학교 치과대학 소아치과학교실) ;
  • 라지영 (원광대학교 치과대학 소아치과학교실)
  • Received : 2016.06.27
  • Accepted : 2016.08.17
  • Published : 2017.05.31
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Abstract

This study assessed the association between ectopic eruption of the maxillary first permanent molar and skeletal malocclusion in 5- to 10-year-old children. As subjects, 786 children who attended the Wonkwang University Dental Hospital for orthodontic diagnosis were included. Children with unerupted first permanent molars or fully erupted second permanent molars were excluded. The study group demonstrated ectopic eruption of the maxillary first permanent molar, while the control group did not. Cephalometric radiographs taken between January 2003 and August 2015 were analyzed. Skeletal class III malocclusion was detected in 57.0% of the study group, which differed significantly from that in the control group (p<0.05). The SNA, ANB angles, and A to N-perpendicular distance were significantly smaller, whereas the A-B plane angle and APDI were significantly greater in the study group than in the control group (p<0.05). The SNB and mandibular plane angles were not significantly different between the groups. Thus, maxillary undergrowth is a risk factor for ectopic eruption of the maxillary first permanent molar.

본 연구는 5 - 10세 아동에서 상악 제1대구치의 이소맹출과 골격적 부정교합 유형 사이의 연관성을 평가하고자 하였다. 상악 제1대구치의 이소맹출이 있는 93명의 아동을 실험군으로, 이소맹출이 없는 693명의 아동을 대조군으로 분류하였다. 제1대구치가 맹출 전이거나 제2대구치가 맹출을 완료한 경우는 연구대상에서 제외하였다. 측모 두부 방사선 사진 계측을 통해 골격적 부정교합의 유형을 조사, 분석하였다. 실험군의 경우, 골격성 3급 부정교합이 57.0% 이었고, 대조군에 비해 골격성 3급 부정교합의 비율이 유의하게 높았다. SNA, ANB, A to N-perpendicular는 실험군에서 작은 경향을 보였고, A-B plane angle과 APDI는 더 크게 나타났다. 반면, SNB와 mandibular plane angle은 두 군 사이에서 유의한 차이가 없었다. 본 연구를 통해 상악의 열성장이 상악 제1대구치의 이소맹출에 영향을 미칠 수 있음을 확인하였다.

Keywords

References

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