Sagsen B, Ustün Y, Demirbuga S, Pala K. Push‐out bond strength of two new calcium silicate‐based endodontic sealers to root canal dentine. International Endodontic Journal, 44, 1088–1091, 2011. Aim To assess the push‐out bond strength of two new calcium silicate‐based endodontic sealers in the root canals of extracted teeth.Methodology Thirty extracted single‐rooted central incisors of similar sizes were selected randomly and distributed to three groups (n = 10). All canals were instrumented using ProTaper rotary instruments to achieve tapered canal walls. Irrigation was performed using 5 mL 2.5% NaOCl between each instrument, and the smear layer was removed using 5 mL 17% EDTA. The canals were filled with three different sealers using a cold lateral compaction technique: group 1: AH Plus + gutta‐percha, group 2: I Root SP + gutta‐percha and group 3: MTA Fillapex + gutta‐percha. Three horizontal sections were prepared at a thickness of 1 mm ±0.1 in the apical, middle and coronal parts of each root. The test specimens were subjected to the push‐out test method using a Universal Test Machine (Instron, Canton, MA, USA) that carried 1‐mm, 0.5‐mm and 0.3‐mm plungers for coronal, middle and apical specimens, respectively. The loading speed was 1 mm min⁻¹. The push‐out data were analysed by two‐way analysis of variance (anova) and the post hoc Holm–Sidak test, with significance set at P < 0.05.Results In the coronal specimens, there was no significant difference between the sealers. In the middle and apical segments, there was no significant difference between I Root SP and AH Plus groups. However, the I Root SP and AH Plus had significantly higher bond strength values than the MTA Fillapex (P < 0.05). In terms of root segments, the bond strengths in the middle specimens and the apical specimens were higher compared with the bond strengths in the coronal specimens (P < 0.05). There were no significant differences between the bond strengths in the middle and apical specimens.Conclusion MTA Fillapex had the lowest push‐out bond values to root dentine compared with other sealers.

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