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This study compared the retreatability of filling material from canals filled with BioRoot RCS (Septodont, Saint‐Maur‐des‐Fosses, France) and AH Plus (Dentsply DeTrey, Konstanz, Germany) combined with gutta‐percha using micro‐computed tomography for evaluation. Thirty‐four mandibular premolars were divided into two groups according to the sealer used. Thirty days after obturation, canals were retreated with a ProTaper Universal retreatment system (Dentsply Maillefer, Ballaigues, Switzerland) followed by passive ultrasonic irrigation (PUI). The time taken for retreatment was recorded. The roots were scanned after obturation, after retreatment and after PUI. Data were analysed using the Mann–Whitney and Wilcoxon tests. Canals filled with BioRoot RCS exhibited significantly less remaining filling material than canals filled with AH Plus (P < 0.05). The addition of PUI resulted in a significant decrease in the residual material in both groups (P < 0.05). A significantly shorter retreatment time was reported for the AH Plus group than the BioRoot RCS group (P < 0.05). [ABSTRACT FROM AUTHOR]

Background: Calcium silicate cements (CSCs), if used for pulp capping or furcation repair, are covered with a restoration. The role of different time intervals of the conditioning process used for final restorations for new CSCs has not been studied. The aim of this study was to evaluate the effects of acid etching on the compressive strengths of biodentine (BD), endosequence bioceramic root repair material-fast set putty (ERRM-FSP), and ProRoot mineral trioxide aggregate (PMTA) at 24 h or 7 days. Materials and Methods: A total of 144 specimens were prepared (48 per material). For each material, 12 specimens were subjected to acid etching at 24 h or 7 days. Compressive strengths were evaluated in accordance with ISO 9917-1:2007 recommendations. Specimens were crushed along their long axis using a universal testing machine. The maximum load required to fracture each specimen was recorded in megapascals. Compressive strengths were compared with the unetched control groups. Results: For all materials, the compressive strengths were significantly higher at day 7 than at 24 h. There were no statistically significant differences between the control and etched groups at 24 h or 7 days for the materials tested. Overall, the compressive strength was significantly lower for ERRM-FSP than for PMTA and BD. Conclusion: The acid-etching procedure did not affect the compressive strength of BD, ERRM-FSP, or PMTA. However, the postponement of the acid-etching procedure until 7 days after CSC placement is suggested to reduce the possibility of displacement. [ABSTRACT FROM AUTHOR]

The article presents a study which assessed the bond strength BioRoot root canal sealers (RCS) relative to various types of bioceramic sealers. Topics mention including the zinc oxide and epoxy resin as the most used sealers, ceramic sealers with calcium phosphate and different techniques in measuring bond strength.