颧弓、乳突上嵴与其相对应的颅中窝底相平。
The anterior portion of the supramastoid crest and zygoma root correlated with the level of the middle fossa.
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％。
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%.
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