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%.
华司组合机，液压自动铣槽机、钻尾螺丝机、选别机、深孔机、攻牙机、自动车床以及夹链胶袋头，及来图订做各类机机械。
Our main products include washer assembly machines, hydraulic automatic slot milling machines, check weighers, deep-hole drilling machines, and zip lock bags. We can also customize various machines.
方法：8例前牙美观区缺失伴唇颊侧牙槽骨凹陷畸形要求种植修复患者，采用自体碎骨屑移植充填骨缺损区，无孔纯钛膜覆盖治疗，共计植入种植体19枚。
Methods:8patients with bone defects in the aesthetic zone were implant19dental implants, the defects around implants were filled with autograft bones, and then covered by titanium membranes.
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