口腔正畸托槽研究中微小力值的测量

对直丝弓滑动法中正畸托槽与弓丝之间的动摩擦力，托槽上的转矩和结扎翼产生的变形角进行测量．设计的加载系统体外模拟正畸过程中牙齿的缓慢移动，可使动摩擦力测量更为精确．采用光学方法测量托槽结扎翼在弓丝扭转状态时变形角的变化．转矩的施加和测量用自行设计的转动轮实现．为自动采集数据设计了完整的数据采集系统．实时得出动摩擦力的时程曲线和托槽齿翼变形角随转矩变化的动态曲线．该方法为临床医学托槽质量评价提供了检测手段．该方法也可用于工程中各种微小力值和位移量的测量。

Measurement of Diminutive Forces in an Orthodontic Bracket

Studies orthodontic sliding mechanics using preadjusted brackets in the measurement of kinetic frictional forces between a bracket and the archwire, as well as torques and deformed angulations of the bracket. In order to attain precise measurement in the kinetic frictional force tests, special loading apparatus is designed to simulate the slow sliding of orthodontic teeth. Optical methods are developed to measure changes of deformed angulations in bracket wings for the archwire in its torsional state. A rotating wheel is used to exert and measure torques on the bracket. An integrated data acquisition system is designed to collect data automatically. Time graphs of kinetic frictional forces and of torques versus deformations in bracket wings are obtained at real time. These methods provide experimental means to evaluate brackets in clinical medicine, and can similarly be of use to all kinds of engineering measurements for diminutive forces and displacements.