TODENTJ-25-03-2019_TODENTJ-10-497 1553506647 Bentham Open doi@benthamopen.net Bentham Open The Open Dentistry Journal TODENTJ 1874-2106 09 23 2016 10 1 Fereshteh Shafiei Nazanin Berahman Elmira Niazi Background: Repair is a conservative treatment of defective composite restoration. Sealing the repair interface is a critical factor to achieve successful repaired restorations. Objective: The aim of this study was to evaluatethe effect of three finishing times on the microleakage at the composite-repair interface. Method: Eighty composite specimens (Z250) were made and aged for eight weeks in water. They were randomly divided into four groups. In the control group, repairing was done with no surface treatment and using bonding agent. In groups 2 to 4, the specimens were repaired following roughening, etching and use of Adper Single Bond, and finished immediately, after 20 minutes and after 24 hours, respectively. After thermocycling, the microleakage at the repair interface was assessed using dye-penetration technique. The results were analyzed using Kruskal-Wallis and Mann-Whitney tests (α=0.05). Results: There was a significant difference among the four groups (P<0.001). The control group with the highest leakage showed a significant difference with the other groups (P<0.05). Immediate finishing showed a significantly higher leakage compared to 20-minute and 24-hour delayed finishing time (P<0.001). The two latter groups had no difference. Conclusion: Immediate finishing of the repaired restorations negatively affect the sealing at the repair interface, while 20-minute and 24-hour delayed finishing had no adverse effect on the interface sealing. 09 23 2016 497 504 TODENTJ-10-497 1 10.2174/crossmark_policy opendentistryjournal.com benthamopen.com true Peer Reviewed Single blind Checked with iThenticate 2014-12-31 2016-07-12 2016-08-10 2016-09-23 https://creativecommons.org/licenses/by/4.0/legalcode 10.2174/1874210601610010497 1553506647 https://opendentistryjournal.com/VOLUME/10/PAGE/497/ https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-497/TODENTJ-10-497.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-497/TODENTJ-10-497.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-497/TODENTJ-10-497.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-497/TODENTJ-10-497.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-497/TODENTJ-10-497.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-497/TODENTJ-10-497.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-497/TODENTJ-10-497.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-497/TODENTJ-10-497.xml J. 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