Application of apical negative pressure irrigation in the nonsurgical treatment of radicular cysts: A case report

Figure 3 Construction of apical negative pressure irrigation system with commonly used clinical instruments. A: Electric aspirator (Smanfeng, Shanghai); B: Flat bottom metal needle and 10 mL disposable syringe; C: The negative pressure irrigation system is used clinically with a 30 G metal needle as a microtube for aspirating the irrigation fluid in the apical segment and a 27 G metal needle as a large cannula for aspirating the irrigation fluid in the middle and upper segments of the root canal. 25 G needle is used as a delivery needle for delivering a constant flow rate of irrigation fluid to the root canal orifice.