The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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THE EFFECT OF RETRACTIVE FORCE ON JAW GROWTH IN GROWING RABBITS

하악골 후방 견인력이 가토의 악골 성장에 미치는 영향에 관한 실험적 연구

  • Kim, Jong-Chul (Department of Orthodontics, College of Dentistry, Chonnam National University) ;
  • Yang, Kyu-Ho (Department of Orthodontics, College of Dentistry, Chonnam National University) ;
  • Lee, Kwang-Sub (Department of Orthodontics, College of Dentistry, Chonnam National University)
  • 김종철 (전남대학교 치과대학 교정학교실) ;
  • 양규호 (전남대학교 치과대학 소아치과학교실) ;
  • 이광섭 (전남대학교 치과대학 교정학교실)
  • Published : 1993.09.01
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Abstract

The purpose of this study was to investigate the effect of jaw growth in a growing rabbits, when they are subjected to refractive force and after removal of refractive force. The experimental animals were Oryctolagus couniculus, male rabbits of 4 weeks of age. The mandible is retracted with 200gm in force of each side to the posterior and superior direction for 14 hours a day. Then rabbits were used as control group. First experimental group received refractive force for 4 weeks. Second experimental group received for 8 weeks. Third experimental group received for 12 weeks. True lateral films and dorso-ventral films were taken before wearing appliances, 4 weeks, 8 weeks, 12 weeks and 16 weeks after wearing appliance. The changes of rabbits jaw growth were observed radiographically. The findings were as follows : 1. Mandibular refractive force decreased total mandibular length, mandibular condylar length and angular length. 2. Mandibular refractive force increased nasal height, condylar width and angular width. 3. Mandibular refractive force decreased mandibular lenght growth but increased mandibular width growth. 4. There is no phenomena of catch-up growth after refractive force removal.

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