快速上颌扩弓保持与复发的动物实验研究  

Retention and relapse of dental arch after rapid palatal expansion in rats

作　　者：陈莉莉[1] 段银钟[1] 李若萱[1] 王海雪[1] 

机构地区：[1]西安第四军医大学口腔医学院正畸科,710032

出　　处：《实用口腔医学杂志》2004年第2期214-217,共4页Journal of Practical Stomatology

摘　　要：目的 :研究腭中缝扩张 (Sd Sd)、牙槽突倾斜和弯曲 (At+b At+b)、牙齿移位 (Td Td)、牙齿倾斜 (Tt Tt)在快速扩弓、保持和复发结束时的比例变化及该变化与扩弓稳定性的关系。方法 :选择 6周龄SD雄性大鼠 2 4只 ,随机分为 3组 ,每组均设实验组 6只和对照组 2只 ,实验组经过快速扩弓期 ( 1周 )、保持期( 4周 )、复发期 ( 4周 ) ,对照组不作扩弓处理 ,制作四环素荧光标记不脱钙磨片 ,在荧光显微镜下观察并将图像输入计算机分析仪测量腭中缝的宽度 (SW )、磨牙颊尖区增宽的量 (即扩弓量M M )和磨牙牙槽嵴增宽的量 (RM RM) ,从而利用公式计算出 4个部分的比例。结果 :磨牙扩弓量 (M M )在扩弓结束时、保持结束时、复发结束时 4部分 [(Sd Sd) :(Tt Tt) :(At+b At+b) :(Td Td) ]的比例变化为 :45 .2 % ( 0 .47mm ):17.8% ( 0 .19mm) :2 5 .7% ( 0 .2 7mm) :11.4% ( 0 .12mm ) -5 2 .3 % ( 0 .47mm) :15 .5 % ( 0 .14mm ):18.9% ( 0 .17mm) :13 .3 % ( 0 .12mm) -61.8% ( 0 .3 4mm) :18.2 % ( 0 .10mm) :1.8% ( 0 .0 1mm) :18.2 % ( 0 .10mm )。结论 :腭中缝扩张 (Sd Sd)是快速上颌扩弓中最重要的部分 ,其稳定性关系到扩弓的成败。Objective:To investigate the retention and relapse of dental arch after rapid palatal expansion. Methods:24 SD male rats of 6 weeks old were divided into 3 groups randomly. Each group had 6 treated and 2 control rats.Sutural displacement (S d-S d),tooth tipping (T t-T t),alveolar process tipping and bending (A t+b -A t+b ) and tooth displacement (T d-T d) were applied respectively for the palatal expansion of maxillary dental arch.The control rats received no expansion. The rats were sacrifaced by the end of active phase (1 week),retention phase (4 weeks) and relapse phase (4 weeks)respectively.Undecalcificated tetracycline labeled bone ground sections were made and observed under fluorescence microscope. The images were put into computer to measure suture width(SW),intermolar area expansion(M-M) and interalveolar ridge expansion(R M-R M) .Results:From active to retention and to relapse phases,the percentage (M-M=100%) contribution of S d-S d,T t-T t,A t+b -A t+b and T d-T d changed from 45.2% (0.47 mm) , 17.8%(0.34 mm) , 25.7%(0.27 mm) and 11.4%(0.12 mm) to 52.3%(0.47 mm) , 15.5%(0.14 mm) , 18.9 %(0.17 mm), 13.3%(0.12 mm) and to 61.8%(0.34 mm) , 18.2%(0.10 mm) ,1.8%(0.01 mm) and 18.2 %(0.10 mm) respectively.The relapse rate(%) of S d-S d,T t-T t,A t+b -A t+b and T d-T d was 27.7±4.5, 55.6 ±5.7,98.0±4.8 and 16.7±5.3 respectively.Conclusion:Mid-palatal sutural displacement(S d-S d)is very important in rapid palatal expansion.

关 键 词：快速上颌扩弓 复发 动物实验 药物标记 腭中缝 

分 类 号：R783.5[医药卫生—口腔医学]