弓面，弓身以木为之，外附有角。弓角，用以加强弓强度的兽角片，覆于弓干中部，外以弓丝缠绕加固。《礼记·曲礼上》：“凡遣人弓者，张弓尚筋，弛弓尚角。”孔颖达疏：“弓之为体，以木为身，以角为面。”
方法三棱滑切固定矫治器的结构，以三棱形弓丝和具有三角槽沟的托槽为主体，由它控制矫治牙在各个方向的移动而发挥矫治作用。
Methods the structure of deltoid arch wire fixed appliance is consist of deltoid arch wire and bracket with deltoid colpus. It is used to control the tooth's moving.
研究结果表明：利用升角与升弓高之间的关系，可简化受电弓运动微分方程的推导；
The results show that the equations have benefit to the deduction of the pantograph's mechanical differential equations.
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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