Push‐out bond strength of two new calcium silicate‐based endodontic sealers to root canal dentine

<jats:sec><jats:label/><jats:p><jats:bold>Sagsen B, Ustün Y, Demirbuga S, Pala K</jats:bold>. Push‐out bond strength of two new calcium silicate‐based endodontic sealers to root canal dentine. <jats:italic>International Endodontic Journal</jats:italic>, <jats:bold>44</jats:bold>, 1088–1091, 2011.</jats:p></jats:sec><jats:sec><jats:title>Abstract</jats:title><jats:p><jats:bold>Aim </jats:bold> To assess the push‐out bond strength of two new calcium silicate‐based endodontic sealers in the root canals of extracted teeth.</jats:p><jats:p><jats:bold>Methodology </jats:bold> Thirty extracted single‐rooted central incisors of similar sizes were selected randomly and distributed to three groups (<jats:italic>n</jats:italic> = 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<jats:sup>−1</jats:sup>. The push‐out data were analysed by two‐way analysis of variance (<jats:sc>anova</jats:sc>) and the <jats:italic>post hoc</jats:italic> Holm–Sidak test, with significance set at <jats:italic>P</jats:italic> < 0.05.</jats:p><jats:p><jats:bold>Results </jats:bold> 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 (<jats:italic>P</jats:italic> < 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 (<jats:italic>P</jats:italic> < 0.05). There were no significant differences between the bond strengths in the middle and apical specimens.</jats:p><jats:p><jats:bold>Conclusion </jats:bold> MTA Fillapex had the lowest push‐out bond values to root dentine compared with other sealers.</jats:p></jats:sec>