Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)

Korean Academy of Pediatric Dentistry (대한소아치과학회)
권호 표지

ERUPTION PATTERN OF THE MANDIBULAR FIRST MOLAR USING THE CONE BEAM CT

Cone Beam CT를 이용한 하악 제 1대구치 맹출 양상에 관한 연구

  • Shin, Jeong-Keun (Department of Pediatric dentistry and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University) ;
  • Kim, Jae-Gon (Department of Pediatric dentistry and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University) ;
  • Baik, Byeong-Ju (Department of Pediatric dentistry and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University) ;
  • Yang, Yeon-Mi (Department of Pediatric dentistry and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University) ;
  • Jeong, Jin-Woo (Department of Pediatric dentistry and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University)
  • 신정근 (전북대학교 치과대학 소아치과학교실 및 구강생체과학연구소) ;
  • 김재곤 (전북대학교 치과대학 소아치과학교실 및 구강생체과학연구소) ;
  • 백병주 (전북대학교 치과대학 소아치과학교실 및 구강생체과학연구소) ;
  • 양연미 (전북대학교 치과대학 소아치과학교실 및 구강생체과학연구소) ;
  • 정진우 (전북대학교 치과대학 소아치과학교실 및 구강생체과학연구소)
  • Published : 2009.08.31
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Abstract

The purpose of this study was to investigate the eruption pattern of the mandibular first molar in sagittal, frontal and horizontal views using the cone beam CT scanning. CT images were obtained from healthy 83 children (42 boys, 41 girls) between 3 to 10 years of age with a normal dentition according to Nolla stage. 1. In the frontal and horizontal view, the intermolar width decreased continuously with stage and slightly increased at the last stage. 2. In the sagittal and frontal view, eruption distances from occlusal plane were observed the largest change between stage 5 and 7. 3. In the horizontal and sagittal view, mandibular first molar from distal surface of primary second molar moved distally between stage 4 and 6. 4. In the sagittal view, angle from occlusal plane to mesio-distal axis increased between stage 4 and 8. 5. In the frontal view, angle from occlusal plane to bucco-lingual axis increased continuously during all stage. 6. In the horizontal view, angle from midsagittal plane to long axis increased between stage 5 and 8.

건강한 정상 교합 어린이 83명(남자 42명, 여자 41명)을 대상으로 보호자 동의하에 cone beam CT 영상을 촬영하여, 하악 제 1대구치의 맹출 양상을 연구하였다. 대상을 발육 정도에 따라 Nolla stage(4-10단계)로 구분한 후 삼차원 기준 평면인 전두면(frontal), 시상면(sagittal), 수평면(horizontal)에서 각각 하악 제 1대구치의 맹출 양상을 관찰하였다. 1. 전두면과 수평면에서, 하악 제 1대구치간 폭경은 감소하였는데, stage 5에서 stage 8까지 가장 크게 감소했다가 약간 증가하였다. 2. 시상면과 전두면에서, 하악 제 1대구치 맹출량은 교합평면을 기준으로 stage 5에서 stage 7까지 가장 많은 맹출 이동을 보였다. 3. 수평면과 시상면에서, 하악 제 1대구치는 제 2유구치 원심면으로부터 stage 4에서 stage 6까지 원심으로 이동하였고 이후 큰 변화가 없었다. 4. 시상면에서, 교합 평면과 하악 제 1대구치의 근원심 치축이 이루는 각은 stage 4에서 stage 8까지 증가하였다. 5. 전두면에서, 교합 평면과 하악 제 1대구치의 협설측 치축이 이루는 각은 지속적으로 증가하였다. 6. 수평면에서, 정중 시상면과 하악 제 1대구치의 치축이 이루는 각은 stage 5부터 stage 8까지 증가하다 stage 8이후에는 다시 약간 감소하였다.

Keywords

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