高性能固定矫治用磁体与橡皮圈组合力的评价  

Evaluating the integrated force induced by high quality magnet and elastics in orthodontic fixed appliance

作　　者：侯志明[1] 常新[1] 代昕[2] 艾红军[1] 姚戈[3] 温井龙[3] 

机构地区：[1]中国医科大学口腔医学院,辽宁沈阳110002 [2]吉林市口腔医院,吉林吉林132011 [3]中国科学院沈阳金属研究所,辽宁沈阳110016

出　　处：《上海口腔医学》2005年第4期387-391,共5页Shanghai Journal of Stomatology

基　　金：辽宁省教育厅攻关计划项目(202013180)

摘　　要：目的:分析与托槽大小相近的高性能固定矫治用磁体与橡皮圈形成的组合力的稳定性及有效工作距离。方法:将形状及体积与托槽相近的N48型钕铁硼,分别与1/8、3/16、1/4、3/8inch正畸弹力橡皮圈组合成超长距离移动牙齿的组合力,使用万能材料实验机对磁体磁力、橡皮圈弹力和组合力进行测试,并绘制力的变化曲线,分析组合力的特征、磁力与橡皮圈弹力的互补作用、不同拉伸距离的组合力中磁力及弹力的构成比,对组合力与橡皮圈弹力的差异进行t检验。结果:随着拉伸间距的加大,磁体磁力急剧下降,而橡皮圈弹力呈线性增大,组合后力的变化较为平缓,力较为恒定,4种组合力分别达到86、138、163、192g超长工作距离(1.25～20mm)稳恒矫治力。拉伸距离为3mm时,磁力占各组合力的百分比范围是34.94%～93.98%。拉伸距离为6mm时,占组合力的12.60%～37.89%。拉伸距离为12mm时,磁力降到仅占组合力的2.69%～5.98%。统计结果显示,拉伸距离为3mm(P<0.01)、6mm(P<0.01)、9mm(P<0.05)时,4种组合力与单独的橡皮圈弹力的差异有显著性。结论:磁体与橡皮圈形成的组合力是一种新型、理想、超长工作距离的稳恒矫治力。PURPOSE： To investigate the stability and effective working distance of integrated forces induced by high quality magnet and elastics in orthodontic fixed appliance. METHODS： N48 NdFeB magnets resembling brackets in size and volume were combined with 1/8. 3/16, 1/4, and 3/8 inch orthodontic elastics respectively to induce integrated forces that had super-long working distance. Magnetic, elastic, and integrated forces were tested by universal material test system and curves of the forces were draw. The characteristics of integrated forces, complementary effects of magnetic and elastic forces, and the proportion between elastic and magnetic forces in integrated forces at different extension distances were analyzed. Unpaired t test was used to analyze the differences between integrated and elastic forces. RESULTS： With the increase of the extension distance, the magnitude of the magnetic for/ces decreased significantly and the elastic forces increased in a liner manner, while the integrated forces were stable and changed mildly. Four kinds of integrated forces achieved 86g, 138g, 163g, and 192g stable forces within super-long distance respectively. Magnetic forces accounted for 34.94%-93.98% of the integrated force at 3ram distance, 12.60%-37.89% at 6mm distance, and only 2.69%-5.98% at 12mm distance. The differences between four integrated forces and elastic forces at 3mm （P〈0.01）, 6mm （P〈0.01）, and 9mm distance （P〈0.05） were significant. CONCLUSION： Integrated forces composed of magnetic and elastic forces were a new ideal stable orthodontic force with super-long working distance. Supported by Key Research Project of Education Bureau of Liaoning Province （202013180）.

关 键 词：钕铁硼磁体 口腔正畸 矫治力 托槽 

分 类 号：R783[医药卫生—口腔医学]