Efficacy of different methods of calcium hydroxide removal on bond strength of calcium silicate-based sealer

Abstract

AimTo evaluate the efficacy of different methods of calcium hydroxide removal [XP-endo finisher (XP-F) file, passive ultrasonic irrigation (PUI) and NaviTip FX (NTFX) irrigating needle] on push-out bond strength of Endoseal MTA calcium silicate-based sealer.Materials and methodsForty extracted human premolars with nearly straight mature roots were used in this study. Teeth were decoronated to obtain a standardized root length of nearly 15 ± 1 mm. Root canals were prepared using ProTaper Universal rotary system up to F4 (40/0.06). Thirty samples were filled with calcium hydroxide paste then after 7 days, it was removed using different methods: G1: XP-F, G2: PUI, G3: NTFX. The remaining ten teeth with no prior medication were used as a control group (G4). All samples were obturated using gutta-percha/Endoseal MTA then transversally sectioned into coronal, middle, apical sections. The obtained sections were subjected to push-out bond strength test using a universal testing machine.ResultsThe highest mean push-out bond strength values were recorded for the control group followed by XP-F file and PUI while the lowest value for NTFX groups. The coronal section recorded the highest mean push-out bond strength value while the lowest value for the apical section with a significant difference in all groups.ConclusionPush-out bond strength values for XP-F and PUI groups were higher than NTFX group.