하악골 후방 견인력이 가면의 악골 성장에 미치는 영향에 관한 실험적 연구
The effect of retractive force on jaw growth in growing rabbits
김종철, 조성진, 이광섭,
소속 상세정보
김종철 ( ) - 전남대학교
조성진 ( ) - 전남대학교
이광섭 ( ) - 전남대학교
KMID : 0361919930230030295
Abstract
The purpose of this study was to investigate the effect of jaw growth in a growing rabbits, when they are subjected to retractive force and after removal of retractive 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 retractive 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 take before wearing appliances, 4 weeks, 8 weeks, 12 weeks and 16 weeks after wearing appliance.
The changes of rabbits jaw growth were observed radiographically.
@ES The findings were as follows:
@EN 1. Mandibular retractive force decreased total mandibular length, mandibular condylar length and angular length.
2. Mandibular retractive force increased nasal height, condylar width and angular width.
3. Mandibular retractive force decreased mandibular lenght growth but increased mandibular width growth.
4. There is no phenomena of catch-up growth after retractive force removal.
KOREA J. ORTHOD 1993 ; 23(3) : 295-309.
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