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Aims: The aim of this study is to evaluate the role of three different intraorifice barrier materials on resistance to fracture of obturated teeth with seal-apex sealer. Subjects and Methods: Eighty extracted human single-rooted mandibular premolars were decoronated to approximately similar dimension, and prepared and obturated with gutta-percha and seal-apex sealer. For the placement of different intraorifice barrier materials, the coronal 3-mm gutta-percha was removed except for the control group. The specimens were divided into four groups (n = twenty) on the basis of the intraorifice barrier material used. Group I: Mineral trioxide aggregate (MTA), Group II: Cention N, Group III: Nanohybrid composite, Group IV: Control, Fracture resistance of the specimens was tested. Statistical Analysis Used: It was done by the statistical software SPSS version 16.0. One-way ANOVA followed by Tukey's HSD test and independent t-test was used. Results: Fracture resistance of endodontically treated tooth was significantly affected by the type of intraorifice barrier used (P < 0.001). Conclusions: The use of nanohybrid composite significantly improved fracture resistance followed by cention N and MTA as compared to the control group. [ABSTRACT FROM AUTHOR]

Aims: Evaluation and comparison of solubility, pH, and calcium ion release of calcium-silicate based root-end filling materials mineral trioxide aggregate (MTA) and biodentine. Methodology: The total sample size for the study was 120. Sixty samples were for solubility of MTA and biodentine and sixty for pH and calcium ion release of MTA and biodentine. MTA and biodentine were added to sixty stainless steel ring molds. The mass of 60 dried glass bottles was measured. Shifting of samples to bottles containing 5 mL of distilled water was done and was stored for 24 h. The bottles were dried at 105°C and weighed. This procedure was repeated for 3, 10, 30, and 60 days. Data obtained for solubility were analyzed with independent t-test. Sixty polyethylene tubes 1 mm long were filled with MTA and biodentine and placed in lidded flasks containing 10 mL distilled water and were preserved in an oven at 37°C. After 2 h, the flasks were removed from hot air oven, and the water was assessed for pH and calcium ion release. pH readings were performed with an pH Meter. Atomic absorption spectrophotometer was used for the detection of calcium ion release. Preservation of the tubes containing the cements was done in new flasks containing 10 mL of distilled water for further detection of pH and calcium ion release in the different time periods of 6, 24 h and 7, 28 days, respectively. Data were analyzed with independent t-test. Results: Significantly higher solubility was exhibited for biodentine for 30 and 60 days than MTA. Statistical difference was observed between the solubility, pH, and calcium ion release values of MTA and biodentine. Conclusions: Biodentine exhibited higher solubility, pH, and calcium ion release in comparison with MTA. [ABSTRACT FROM AUTHOR]