Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)

Korean Academy of Pediatric Dentistry (대한소아치과학회)
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The Simple Regression Model of Gonial Angles : Comparison between Panoramic Radiographs and Lateral Cephalograms

Gonial Angle의 단순 회귀 모델: 파노라마 영상과 측모두부 영상간의 비교

  • Park, Sung-Hee (Department of Pediatric Dentistry, School of Dentistry, Seoul National University) ;
  • Kim, Young-Jae (Department of Pediatric Dentistry, School of Dentistry, Seoul National University) ;
  • Lee, Sang-Hoon (Department of Pediatric Dentistry, School of Dentistry, Seoul National University) ;
  • Kim, Chong-Chul (Department of Pediatric Dentistry, School of Dentistry, Seoul National University) ;
  • Jang, Ki-Taeg (Department of Pediatric Dentistry, School of Dentistry, Seoul National University)
  • 박성희 (서울대학교 치의학대학원 소아치과학교실) ;
  • 김영재 (서울대학교 치의학대학원 소아치과학교실) ;
  • 이상훈 (서울대학교 치의학대학원 소아치과학교실) ;
  • 김종철 (서울대학교 치의학대학원 소아치과학교실) ;
  • 장기택 (서울대학교 치의학대학원 소아치과학교실)
  • Received : 2016.07.14
  • Accepted : 2016.10.12
  • Published : 2017.05.31
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Abstract

The aim of this study was to enhancing the panoramic radiograph's clinical use for assessing mandibular measurements and formulating a function of those measurements from panoramic radiographs and lateral cephalograms in children. The panoramic radiographs and lateral cephalograms of 99 former orthodontic patients with skeletal class III malocclusion were selected. In each radiograph, gonial angles, ramus heights, and distance between lower incisors and symphysis were measured. The values of the studied parameters were compared by paired t-test, Pearson's correlation test and regression analysis. The mean value of the gonial angle in panoramic radiographs was $125.49^{\circ}$, and the value in lateral cephalograms was $127.50^{\circ}$. The Pearson's correlation coefficient (${\rho}$) between mean values of gonial angle in each radiograph was 0.945 (p < 0.001). The relationship between the gonial angle measurements obtained from each radiographs was represented as 'Gonial angle (Lateral cephalograms) = 0.920 ${\times}$ Average gonial angle (Panoramic radiographs) + 12.072' in the linear function. The coefficients of ramus heights, and distance between lower incisors and symphysis portrayed weaker correlations than gonial angles. A panoramic radiograph could be used to determine the gonial angle as accurately as a lateral cephalogram, and each gonial angle showed a strong positive relation. A panoramic radiograph is a useful tool for examining vertical growth pattern of patients, as well as a lateral cephalogram.

본 연구의 목적은 파노라마 영상과 측모두부 영상에서 유의미한 상관관계를 가지는 계측치를 확인하고, 그 관계를 수식화하는 것이다. 99명의 3급 부정교합 환자의 파노라마 영상과 측모두부 영상에서 gonial angle, 하악지 높이, 하악중절치에서 하악하연까지의 길이를 측정하여 평가하였다. 측정된 수치는 각각 대응 표본 T검증, Pearson's 상관관계 검정, 회귀 분석을 통해 평가하였다. 측모두부 영상에서의 gonial angle 평균값은 $127.50^{\circ}$, 파노라마 영상에서의 값은 $125.49^{\circ}$, 상관계수는 0.945(p < 0.001)로 나타났으며, 상관관계는 '측모두부 영상의 gonial angle = 0.920 ${\times}$ 파노라마 영상의 gonial angle + 12.072'로 나타낼 수 있다. 다른 계측치들 간의 상관관계는 gonial angle에 비해 낮게 나타났다. Gonial angle은 파노라마 영상과 측모두부 영상에서 모두 재현성 있게 측정 가능하며, 강한 양의 상관관계를 나타낸다. 파노라마 영상 또한 측모두부 영상과 같이 환자의 수직성장패턴을 평가하는데 도움을 주는 방법이다.

Keywords

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