Influence of ultrasonic activation over final irrigants in the removal of photosensitizer from root canal walls after photodynamic therapy

Publication date: Available online 5 January 2017
Source:Photodiagnosis and Photodynamic Therapy
Author(s): Matheus Albino Souza, Bianca Pazinatto, Karolina Frick Bischoff, Huriel Scartazzini Palhano, Doglas Cecchin, José Antônio Poli de Figueiredo
IntroductionThe aim of the present study was to evaluate the influence of ultrasonic activation (US) of the final irrigant in the removal of the photosensitizer from root canal walls after photodynamic therapy.MethodsThe root canals of 60 single-rooted bovine extracted teeth were filled with 0.01% methylene blue and submitted to photodynamic therapy for 90seconds. After that, the roots were divided into six groups (n=10) according to the final irrigation protocol: distilled water (DW), DW+US, 17% EDTA, QMix, EDTA+US, and QMix+US. Then, the samples were submitted to scanning electron microscopy where a scoring system was used to evaluate the images and effectiveness of proposed treatments in the cervical, middle and apical regions of the root canals. The data were statistically analyzed by the Kruskal-Wallis and Mann-Whitney U tests for intergroup comparisons as well as the Wilcoxon and Friedman tests for intragroup comparisons at 5% of significance.ResultsThe 17% EDTA+US and QMix+US treatments were most effective in the removal of the photosensitizer in all regions of the root canal; the difference was statistically significant when compared to all other groups (p<0.05). There were no significant differences in the intragroup analysis comparing the effectiveness in the different regions of the same group (p<0.05).ConclusionsUS can aid 17% EDTA and QMix in removing the photosensitizer after photodynamic therapy and contributes to cleaning root canal walls.



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