牙型角是指螺纹轴向截面内，螺纹牙型两侧边的夹角。
同时改变钻具接头的螺纹参数，研究螺距、锥度、牙型角的改变对其应力分布的影响，为钻具接头的生产加工提供参考。
Meanwhile, we change the thread parameters, study the stress distribution caused by changing the pitch, taper and thread Angle, this work can provide a reference for manufacture.
本文对高角型深覆(牙合)形成的机理、切牙压低量的意义、应用多用途弓的注意事项进行了讨论。
It was also debated in this article that the mechanism of deep overbite of high Angle, sence of the amount of intrusion of incisors and notice in using utility arch.
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