The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Labial and buccal surface contours of Korean normal occlusion in a three-dimensional digital model

한국인 정상교합자의 3차원 디지털 모형을 이용한 순,협측 치면 곡률

  • Chae, Ji-Hyeon (Department of Orthodontics, School of Dentistry, Yonsei University) ;
  • Song, Jin-Wook (Department of Orthodontics, School of Dentistry, Yonsei University) ;
  • Cha, Jung-Yul (Department of Orthodontics, School of Dentistry, Yonsei University) ;
  • Choi, Jung-Soo (HT Corp) ;
  • Park, Young-Chel (Department of Orthodontics, School of Dentistry, Dental Science Research Institute, Yonsei University)
  • 채지현 (연세대학교 치과대학 교정학교실) ;
  • 송진욱 (연세대학교 치과대학 교정학교실) ;
  • 차정열 (연세대학교 치과대학 교정학교실) ;
  • 최정수 (HT(주)) ;
  • 박영철 (연세대학교 치과대학 교정학교실, 구강과학연구소)
  • Published : 2008.04.30
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Abstract

Objective: This study was performed to investigate the labio/buccal clinical crown curvatures of Korean permanent teeth and to obtain the curve-ratio data in an attempt to fabricate bracket bases fit for each individual Korean permanent tooth. Methods: Three-dimensional digital models were made from 30 sets of dental casts with normal anatomic structures. According to the FA points, horizontal and vertical reference planes were established and lines were drawn on the tooth surfaces in reference to these planes. The curvature was expressed as the coefficient of a quadratic equation. Lines mesial, distal, gingival and occlusal to the horizontal, vertical reference planes and the FA point were drawn. Results: The curvature measured for each line revealed that there are no significant differences between male and female, except for maxillary canines and maxillary second bicuspids (p > 0.05). There were notable differences in the mesio-distal or gingivo-occlusal curvatures among the mandibular lateral incisors, maxillary canines, maxillary and mandibular first and second bicuspids and first molars (p < 0.05). Conclusions: The labial & buccal crown curvatures of teeth in Korean normal occlusion were measured on the mesial and distal, gingival and occlusal sides respectively in this study. Based on these data, a SWA can be developed to fit the individual features of Korean tooth crowns.

본 연구는 한국인의 치아형태에 적합한 브라켓 베이스를 만들기 위해 임상 치관의 순,협측 곡률을 3차원적으로 계측하여 치관의 곡률 자료를 얻고자 하였다. 정상적인 해부학적 형태를 가지는 구강모형 30쌍을 3차원 디지털 모델로 제작한 후, FA점을 기준으로 수평 기준면과 수직 기준면을 설정하였다. 이 기준면에 대한 치면의 곡선을 형성한 후, 곡률을 이차방정식의 계수로 표현하였다. 수평면과 수직면의 곡률과 FA점을 기준으로 근심과 원심, 치은측과 교합면측의 곡률을 측정한 결과, 상악견치와 상악 제2소구치 외에는 남녀간 치면 곡률의 유의한 차이가 없었다. 하악 측절치, 상악 견치, 상하악 제1, 2소구치와 제1대구치에서 근원심 또는 치은교합면측 치면 곡률의 유의한 차이가 관찰되었다 (p < 0.05). 본 연구에서 얻어진 순,협측 치면의 곡률 자료는 한국인의 치아 형태에 적합한 Straight Wire Appliance 개발의 기초 자료로 활용될 수 있다.

Keywords

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