الفهرس 
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Abstract
Aim: To clinically evaluate the effect of different root canal irrigation activation techniques (XP-endo Finisher file and sonic EDDY system) on penetration depth of irrigation into the apical third of root canals and post-operative pain after single-visit endodontic treatment. Materials and methods: Thirty patients requiring endodontic therapy of asymptomatic vital or non-vital maxillary central incisors or canine teeth were enrolled in this study. Root canal treatment was done in single-visit using ProTaper Universal rotary system. Irrigation was done using 2.5% sodium hypochlorite (NaOCl). Patients were randomly assigned into three equal groups according to the final irrigation activation method, group 1: needle irrigation, group 2: XP-endo Finisher file activation and group 3: sonic EDDY activation system. Final irrigation with the contrast medium was done 2 mm shorter than working length (WL) and activated in all groups. Irrigant penetration depth was measured using digital radiography and evaluated on SIDEXIS-XG software. Postoperative pain was assessed after 8, 24, 48 hours, one and two weeks using Visual Analogue Scale (VAS). Scores were collected from patients and statistically analyzed. Results: Needle irrigation group showed the least penetration depth with statistically significant difference compared to the other two groups (P < 0.001). Xp-endo finisher and EDDY groups had higher penetration depth with statistically insignificant difference compared between each other. Regarding post-operative pain, Xp-endo Finisher group showed the least post-operative pain values while needle irrigation group showed the highest values and this difference was statistically significant (P = 0.002). EDDY group had lower post-operative pain values than needle group but the difference was statistically insignificant. In all groups the intensity of post-operative pain decreased over time. Conclusions: Xp-endo Finisher and EDDY system promote irrigant penetration depth into the apical third of root canals and reduce post-operative pain after single-visit endodontic treatment than needle irrigation.