摘要
作者用1年生家犬共16只。选择犬上颌第2切牙作旋转移动。力值100g,扭力矩为550g·mm。正畸的时间为3d至8周,每2周加力1次,加力1～4次。加力时取模作测量。实验结果表明,犬单根牙的扭转速率平均为3.04^(?)/周。同时描绘分析了犬牙扭转移动的曲线。曲线呈平缓的阶梯形。文章还介绍了1种新设计的犬牙扭转实验装置。设计合理新颖,符合力学原理,扭转满意。在测量犬牙扭转角度的方法上,采用取模测量法,根据几何图形测量角度。方法简便,测量准确。
Sixteen one year -old dogs were used in our experiment. We rotated the maxillary second incisors of the dogs, applying 9 force of 100 grams and a moment of 550 g .mrn.The duration of experiment varied from 72 hours to 8 weeks. Activation was performed once every 2 weeks and impressions were taken in order to measure the angles of rotation. Operation of activation vaned from 1 to 4 times. The results of our experiment show that the rate of rotation is 3.04°/week in single - root teeth in dogs. The graph of tooth rotation is also traced and analysed. The graph of tooth rotation is like as the form of upstairs. This paper introduces a new specialised experi-mental apparatus for tooth rotation and a new metho of measuring the angle of tooth rotation. The angles of rota-tion are measured geometrically, enabling simple and accurate results to be obtained.
出处
《第四军医大学学报》
1990年第4期261-263,共3页
Journal of the Fourth Military Medical University
关键词
牙移位
扭转
牙根
切牙
狗
tooth migration
rotation
tooth root
incisor, animals, laboratory
dogs
