الفهرس | Only 14 pages are availabe for public view |
Abstract Abstract Keywords: Calcium hydroxide, Endoseal MTA, NaviTip FX, Passive Ultrasonic irrigation, Push-out bond strength, XP-endo Finisher. Aim: The aim of this study was to evaluate the efficacy of different methods of calcium hydroxide removal (XP-endo Finisher file, PUI and NaviTip FX irrigating needle) on push-out bond strength of Endoseal MTA calcium silicate based sealer. Materials and methods: Forty extracted human premolars with straight mature roots were used in this study. Teeth were decoronated to obtain standardized root length of nearly 15±1 mm. Root canals were prepared using rotary ProTaper universal system up to F4 (40 / 0.06). Thirty samples were filled with Ca(OH)2 paste then after 7 days it was removed using different methods: G1: XP-endo Finisher file, G2: PUI and G3: NTFX. The remaining ten teeth with no prior medication were used as control group (G4). All samples were obturated using gutta-percha/Endoseal MTA then transversally sectioned into coronal, middle and apical sections. The obtained sections were subjected to push-out bond strength test using a universal testing machine. Results: The highest mean push-out bond strength values were recorded for control group followed by XP-endo finisher file, 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 significant difference in all groups. Conclusions: None of the investigated methods were able to completely remove all Ca(OH)2 from the three sections. Residual Ca(OH)2 affected the push out bond strength of Endoseal MTA sealer negatively. |