Bend degree is a basic unit to measure tonal arch degree.
折度是计量声调曲拱的基本单位。
The residual bend results from the plastic deformation imparted as the string is spooled around the radius of the reel and guide arch.
在挠性管柱绕着卷筒半径和导拱缠绕时，所给予的塑性变形造成了残留弯曲。
Conclusion: We use L as arch length and H as chord length to bend syringe needle that is used to posterior superior alveolar nerve block anesthesia by intraoral injection. The success rate is 98%.
结论：以牙槽孔至颧下嵴起始部的弧长和弦长为标准弯制注射针头，采用口内注射法进行上牙槽后神经阻滞麻醉，成功率为98％。
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