文中研究了牙输钻头工作的规律。分析认为,对于非粘结性岩石,牙输钻头的效率远未发挥,必须改进钻头结构,建立合理的凿岩制度。 In this paper, the law of the work of the tooth bit is studied. The analysis shows that for the non-cohesive rock, the efficiency of dental drill is far from being exerted, and the structure of drill bit must be improved and a reasonable drilling system should be established.