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RISS 인기검색어
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- 저자 : 장지철(Ji-Chul Chang) (검색결과 1 건)
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성견의 전치부 INTRUSION시 간헐적 교정력과 지속적 교정력의 적용에 따른 치근 흡수에 관한 실험적 연구
장지철(Ji-Chul Chang),박영철(Young-Chul Park) 대한치과교정학회 1992 대한치과교정학회지 Vol.22 No.1
The purpose of this study was to investigate the root resorption pattern in incisors in dog under intrusive orthodontic loadings of various magnitude and duration. Intrusive forces were generated by closed coil springs. Force magnitudes were 15-30gm, 50-60gm and 80-110gm. Durations were continuous and intermittent. Intermittent duration was applied at intervals of 12 hours. The readjustment of the force was done every 4 days. The forces were maintained for 30 days. All specimens were decalfied, embedded in paraffin and stained with hematoxylin-eosin stain. Observations were made with light microscope. The following results were obtained; 1. The continuity of root surface was ceased in all, except intermittent forced teeth with 25gm. 2. The root resorptions, cementoclasts and cemental lacunae, were increased around periapical regions and the destructive scope of bone was deeply extended as the exerted orthodontic forces increased. 3. It was inspected that, under the same forces, root resorption and bone destruction were more deeply appeared in the continuously forced teeth than the intermittently forced ones. 4. All of the alveolar bone, showed direct and undermining bone resorptions.
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