目的初步比较经颈前路单枚单头螺纹中空加压螺钉与双头螺纹中空加压螺钉内固定治疗齿突骨折的效果。
Objective To compare the clinical effectiveness of fixations of odontoid process fractures preliminarily with anterior single one-threaded and double-threaded canulated compressive screws.
本文提供了一种在三坐标测量机上用小测头在单侧螺旋面上测量圆锥螺纹的新方法，其特点是测量速度快、效率高。
It is a new method for measuring conical threads by means of CMM on single flank, which is quick and efficient.
本文提供了一种在三坐标测量机上用小测头在单侧螺旋面上测量圆锥螺纹的新方法，其特点是测量速度快、效率高。
It is a new method for measuring conical threads by means of CMM on single flank, which is quick and efficient.
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