Lehtinen R, Aarnisalo T
Acta Odontol Scand. 1977;35(1):9-11. doi: 10.3109/00016357709055985.
The positive aspirations obtained with a self-aspirating syringe (Astra, Sweden) were compared with those obtained when aspiration was performed manually (Uniject syringe, Hoechst, West Germany). The subjects were 1186 army recruits, to whom 2348 injections of local anesthetic were given in connection with dental treatment. When aspiration was performed manually, the results were positive in 4.7% of the cases; with the self-aspirating syringe, they were positive in 1.1% of the cases. The total frequency of positive aspirations was significantly higher (P less than 0.001) with the manual aspiration technique than with the self-aspirating syringe was due to the fact that the value did not include aspiration occurring when the injection needle ruptured small blood vessels.
将使用自吸式注射器（瑞典阿斯特拉公司）获得的阳性抽吸结果与手动进行抽吸时（西德赫斯特公司的Uniject注射器）获得的结果进行了比较。研究对象为1186名新兵，在牙科治疗期间为他们进行了2348次局部麻醉注射。手动进行抽吸时，4.7%的病例结果为阳性；使用自吸式注射器时，1.1%的病例结果为阳性。手动抽吸技术的阳性抽吸总频率显著高于自吸式注射器（P小于0.001），这是因为该数值未包括注射针穿破小血管时发生的抽吸情况。
