Analysis of the handing method and the electric method for measuring work length of root canals. 手感法和电测法确定根管工作长度的研究。
The effect of liner material quality on the impact force of grinding media is studied by the electrical measurement method and with a selfmade simulation measurement device. 利用自制的模拟测定装置，采用电测法研究了衬板材质对磨矿介质冲击力的影响。
