我们采用在鼻腔鼻窦内窥镜下行窦腔内断根取出５例，均取得较好的效果。现报告如下。一般资料：本组男３例，女２例；年龄２１～５０岁；其中６１４例、１６１例，均为死髓牙断根（助手操作不当所致２例）。方法：以２％地卡因＋副肾素（２０∶１）行鼻粘膜表面麻醉，并对鼻 We use the nasal sinus endoscopic descending sinus root removed 5 cases were achieved good results. The report is as follows. General information: The group of 3 males and 2 females; aged 21 to 50 years; of which 614 cases, 161 cases, are dead pulp teeth root (assistant due to improper operation in 2 cases). Methods: Nasal mucosal surface was anesthetized with 2% dexamethasone plus adrenergic (20: 1) and nasal