Effect of heat generated root canal filling techniques on bond strength of NeoSealer Flo BC, AH Plus BC and BioRoot RCS to root dentin

This study aimed to assess the effect of heat-generated root canal filling techniques-warm vertical compaction (WVC) and core-carrier (CC)-on the bond strength of bioceramic sealers (NeoSealer Flo BC, AH Plus BC, BioRoot RCS) compared with the resin-based sealer AH Plus. A total of 168 single-rooted mandibular premolars were prepared and randomly assigned to 12 groups according to sealer type and filling technique: hydraulic condensation (HC), WVC, or CC. Push-out bond strength was tested using a universal testing machine, and failure modes were analyzed. Two-way ANOVA was used for statistical comparisons (P = 0.05). The results revealed that AH Plus BC and NeoSealer Flo BC exhibited the highest mean bond strengths across techniques. Both AH Plus and BioRoot RCS showed significantly lower bond strengths (P ≤ 0.05) when used with WVC and CC. However, no significant difference (P > 0.05) was observed for AH Plus BC and NeoSealer Flo BC between WVC and CC. These findings indicate that bioceramic sealers, AH Plus BC and NeoSealer Flo BC, maintain their bonding performance under heat stress, suggesting potential clinical advantages when heat-based obturation techniques are used.