超声波对兔牙移动影响的光镜观察

Light Microscopy Study of Using Ultrasound to Accelerate Orthodontic Tooth Movement

对兔正畸牙辅以局部超声波作用,通过对实验第1、3、5、7、14d局部组织的光镜观察,探讨超声彼加速正畸牙齿移动的机理,为临床应用提供实验依据。选用2.0～2.5kg的青紫兰兔38只,随机分为实验(16只)、加载对照(16只)、超声波对照(3只)、空白对照(3只)四个组。观察结果显示:实验组兔从第5d起直至实验结束,其牙周张力侧骨生成量及压力侧骨吸收量均比加载对照组多,牙周膜血管化反应显著;压力侧齿槽骨表面及骨吸收陷窝内的破骨细胞量比加载对照组多。

Using locally applied ultrasound to accelerate orthodontic toothmovement and to elucidate the mechanism of the effect by histologic examinationsof local tissues on 1st, 3rd, 5th, 7th, and 14th day so as to provide experimentalfoundation for its clinical application.Thirty-eight newfoundland rabbits, weighing2. 0-2. 5kg, were divided at random into 4 groups: ultrasound-orthodontic group(UOG), orthodontic group (OG), ultrasound group (UG), control group(CG).The results were:the UOG animals demonstrated histologic evidence of presence ofsignificantly greater amount of bone and matrix deposited in the area of tensionand absorption in the area of pressure side from the 5th day to the 14th day ofthe experiment. The UOG also demonstrated histologic fact of activating of thevascular system and the significantly greater numbers of osteoclasts in the surfaceand Howship's lacuna of the alveolar bone in the area of pressure side.