The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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A LONGITUDINDAL STUDY OF GROWTH CHANCE ON THE MANDIBULAR SYMPHYSIS AND LOWER INCISORS

하악정중결합과 하악절치의 성장변화에 관한 누년적 연구

  • Shim, Won-Sub (Department of Orthodontics, Division of Dentistry Kyung Hee University) ;
  • Chung, Kyu-Rhim (Department of Orthodontics, Division of Dentistry Kyung Hee University) ;
  • Lee, Ki-Soo (Department of Orthodontics, Division of Dentistry Kyung Hee University)
  • 심원섭 (경희대학교 치과대학 교정학교실) ;
  • 정규림 (경희대학교 치과대학 교정학교실) ;
  • 이기수 (경희대학교 치과대학 교정학교실)
  • Published : 1987.03.01
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Abstract

The purpose of this longitudinal study was to examine the growth changes of mandibular symphysis and lower incisors with age. The material was 294 lateral cephalometric radiographs taken longitudinally from 6 to 13 year old children, who were not teated orthodontically. The following conclusions seem to be warranted. 1. The sex difference of the measurements of mandibular symphysis and lower incisors were not statistic ally significant. 2. There were growth increments (2.69mm in boys and 2.08mm in girls) in the total thickness of mandibular symphysis. 3. There were a great change and individual variations on the curvature of anterior border of mandibular symphysis. 4. The chin angle had a tendency to decrease progressively in both sexes. 5. There were growth increments (8.23mm in boys and 7.40mm in girls) in the anterior dental height. 6. The lower anterior teeth tended to incline labially with age.

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