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Quintessence Int 40 (2009), No. 10     1. Oct. 2009
Quintessence Int 40 (2009), No. 10  (01.10.2009)

Page 875-879, PubMed:19898720


Comparison of 2 flushing methods used during passive ultrasonic irrigation of the root canal
van der Sluis, Lucas / Wu, Min-Kai / Wesselink, Paul
Objective: 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.
Method and Materials: 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.
Results: 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).
Conclusions: 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.

Keywords: continuous flow, flushing method, irrigant, irrigation, passive ultrasonic irrigation, root canal, time