Burak Sagsen

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.

Aim: The aim of this study was to evaluate the antimicrobial efficiency of different root canal sealers onEnterococcus faecalis(E. Faecalis) at different time intervals.Methods and Materials: All sealers used were mixed according to the manufacturers’ instructions then 75 mg of each sealer was added to different sterile tubes and evaluated at 20 minutes, 24 hours, 7 days, and 30 days. A time-kill assay (TKA) was used to determine the antimicrobial efficiency of the sealers.Results: AH Plus and MCS were found to be bactericidal at 20 minutes and 24 hours, but only MCS was bactericidal at the seventh and thirtieth days. Epiphany and Sealapex were found to be bacteriostatic at the seventh and thirtieth days but indifferent at 20 minutes and 24-hours. MCS and AH Plus were both found to be bactericidal in freshly mixed samples, but only MCS was bactericidal at longer time periods. Epiphany Sealer and Sealapex were found to be bacteriostatic at longer time periods but indifferent at 20 minutes and 24 hours.Conclusion: The antibacterial effect of MCS was greater than the other sealers evaluated.Clinical Significance: Sealers containing eugenol and epoxy resin might be preferable due to their antibacterial effect.Citation: Sagsen B, Er O, Esel D, Yagmur G, Altintop Y.In vitroPharmacodynamic Activities of Root Canal Sealers onEnterococcus faecalis. J Contemp Dent Pract 2009 May; (10)3:035-042.

Aim  To compare the fracture resistance of roots filled with different materials.Methodology  Thirty‐four freshly extracted human maxillary central incisor teeth with similar dimension were selected. Crowns were sectioned at the cemento‐enamel junction, and the length of the roots were adjusted to 13 mm. Following the preparation of the root canals and final irrigation with EDTA and saline, the 10 root canals in group 1 were filled with Resilon cones and Epiphany sealer, the 10 root canals in group 2 were filled with gutta‐percha and AH 26 and the 10 root canals in group 3 were filled with gutta‐percha and MCS Canal Sealer. All materials were used with a cold lateral condensation technique. Four root canals remained unfilled and were used as a control group. Tests for fracture strength were performed using a universal testing machine and a round tip that had a diameter of 4 mm. The force was applied vertically with a constant speed of 1 mm min⁻¹. For each root, the force at the time of fracture was recorded in Newtons. Results were evaluated statistically with anova and Tukey Honestly Significant Difference (HSD) tests.Results  The mean force of fracture values was 1043 N, 967 N, 859 N and 517.5 N for groups 3, 1 and 2 and the control group, respectively. There was a significant difference (P < 0.01) between the experimental groups and the control group. No significant differences were found between the three experimental groups.Conclusions  All the materials used in the present study reinforced the prepared root canals.