This paper develops the research of the measure instrument of non-cylindrical pin bore which can meet the users' requirements at the aspects of its precision, efficiency, and economy.
本论文正是要开展异型销孔轮廓测量仪的研究，使其测量精度、效率、经济性都能满足用户要求。
"The follower is a cylindrical component with a helical slot and a pin that runs through it," he adds.
从动装置是一个圆柱形的组件，带有一个螺旋状的槽和一个销子。
Objective: To evaluate the clinical of using prefabricated cylindrical root canal pin to lengthen the clinical crown and restoring anterior tooth and premolar defect with PFM.
目的：评价应用预成圆柱形根管钉对前牙牙体缺损患者冠再接后烤瓷修复体的临床效果。
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