van der Sluis Lucas, Wu Min-Kai, Wesselink Paul
Department of Cariology, Endodontology, and Pedodontology, Academic Centre for Dentistry Amsterdam, Amsterdam, The Netherlands.
Quintessence Int. 2009 Nov-Dec;40(10):875-9.
To determine the effect of irrigation time on the removal of dentin debris from root canals irrigated with passive ultrasonic irrigation comparing 2 flushing methods.
Root canals with a standardized groove in 1 canal wall, which was filled with dentin debris, were irrigated ultrasonically or with syringe irrigation. The quantity of dentin debris after irrigation was determined. In groups 1 to 4, the irrigant was activated by an ultrasonically activated file. In groups 1 and 2 (n = 20), the canals were flushed 3 or 1.5 minutes using a continuous flow of irrigant. In groups 3 and 4 (n = 20), the irrigation time was 1 or 3 minutes, and the canals were flushed 3 times by syringe irrigation (intermittent flushing method). In group 5 (n = 20), the root canals were flushed 3 times using syringe irrigation.
Significantly more dentin debris was removed when the irrigant was activated by ultrasound (P = .000). Significantly less dentin debris was removed when the root canals were irrigated with a continuous flow of irrigant for 1.5 minutes (P = .005).
Three minutes of ultrasonic irrigation with the intermittent flush technique or a continuous flow is as effective as 1 minute with the intermittent flush technique. The efficiency of the ultrasonic irrigation with a continuous flow is time dependent, 1.5 minutes being less efficient than 3 minutes.
比较两种冲洗方法，确定冲洗时间对采用被动超声冲洗的根管内牙本质碎屑清除效果的影响。
在根管壁上有标准化凹槽且充满牙本质碎屑的根管，采用超声冲洗或注射器冲洗。测定冲洗后牙本质碎屑的量。在第1至4组中，冲洗液由超声激活锉激活。在第1组和第2组（n = 20）中，使用连续冲洗液流对根管冲洗3分钟或1.5分钟。在第3组和第4组（n = 20）中，冲洗时间为1分钟或3分钟，通过注射器冲洗对根管冲洗3次（间歇冲洗法）。在第5组（n = 20）中，使用注射器冲洗对根管冲洗3次。
当冲洗液由超声激活时，清除的牙本质碎屑明显更多（P = .000）。当用连续冲洗液流对根管冲洗1.5分钟时，清除的牙本质碎屑明显更少（P = .005）。
采用间歇冲洗技术或连续冲洗液流进行3分钟超声冲洗与采用间歇冲洗技术进行1分钟超声冲洗效果相同。连续冲洗液流超声冲洗的效率与时间有关，1.5分钟的效率低于3分钟。
