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Revista de Odontologia da UNESP

On-line version ISSN 1807-2577


ZART, Priscila Tahani Michelsen et al. Efficacy of irrigation ultrasonic passive in removal of calcium hydroxide paste from root canals. Rev. odontol. UNESP [online]. 2014, vol.43, n.1, pp.15-23. ISSN 1807-2577.


Remnants of calcium hydroxide (Ca(OH)2) can interfere in the quality of endodontic treatment.


Evaluate the efficacy of Passive Ultrasonic Irrigation (PUI) associated with the conventional technique in removing intracanal medication Ca(OH)2-based.


: Thirty monoradiculares anterior human teeth were used. The root canals were prepared with manual instruments type K and filled with intracanal medication Ca(OH)2-based containing CMCP and propylene glycol. After 7 days, Ca(OH)2 was removed of all root canal with a manual instrument and irrigation of the 1% NaOCl with syringe. The specimens were randomly divided into two groups (n=12) according to the final irrigation: Manual Irrigation - manual agitation of 17% EDTA and 1% NaOCl irrigation; PUI - ultrasonic agitation of NaOCl 1% (3 activations of 20s) followed by activation of 17% EDTA for 1 min. The control group (n=6) received no medication. All the specimens were cleaved and the amount of Ca(OH)2 remaining was calculated with the auxiliary of estereomicroscrópio (20×). Kruskall-Wallis tests and Wilcoxon tests were used to evaluate the percentage of Ca(OH)2 remaining.


The group of PUI showed statistically the lowers percentages of Ca(OH)2 when compared to group of Manual Irrigation, independently, of thirds analyzed (P < 0.05). The apical showed the higher amount of residual medication, in both groups (P < 0.05).


The association of PUI with the conventional technique proved to be more efficient in removing medication of Ca(OH)2-based that the combination of Manual irrigation with conventional technique.

Keywords : Calcium hydroxide; ultrasound; irrigation.

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