Filling ability and bond strength of calcium silicate-based materials

AIM or PURPOSE This study aimed to evaluate the effect of different application methods of various calcium silicate-based materials on the filling ability and bond strength in retrograde cavities. MATERIALS and METHOD After Ethics Committee approval, 110 single-rooted-teeth were endodontically treated. After root-end resection and apical preparation, the specimens were separated into eleven groups: Biodentine, MTA Angelus, MTA Fillapex, MTA Repair HP, MTA Fillapex+ MTA Repair HP, MTA Flow Thick, MTA Flow Putty, MTA Flow Thick + MTA Flow Putty, TotalFill BC RRM Paste, TotalFill BC RRM Putty, TotalFill BC RRM Paste + TotalFill BC RRM Putty. Using a Micro-CT scanner and tridimensional images reconstructed, the filling ability of materials (the volume percentage of gaps and voids) was calculated. After, two slides of root tip discs were created. Push-out bond strength was measured using a universal testing machine. Also, the relationship between the total volume of void% and push-out bond strength was examined. RESULTS All samples presented voids and gaps. There was no statistical difference regarding the volume of void%. TotalFill BC RRM Paste had the highest volume of gaps. MTA Fillapex exhibited significantly the lowest bond strength than other groups. MTA Angelus had a significantly higher bond strength than other groups except for MTA Repair HP, Biodentine, and TotalFill BC RRM Putty. There was no significant correlation between the total volume of porosity% and push-out bond strength. CONCLUSION(S) While the adhesion capacity of the investigated materials significantly decreased when the prior application of paste before delivery of putty, the change in volume of void% was statistically insignificant.