Physical properties of two improved experimental root end-filling materials, MTA and Biodentine
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Introduction: After the expanded use of mineral trioxide aggregate (MTA) in endodontics, accelerated formulae have been developed to modify and improve the material in regards to its lengthy setting time and compressive strength. Also, manufacturing companies have developed similar materials with superior physical prosperities. The best setting time and compressive strength results were obtained when the composition of the accelerant formulation included CaCl 2fumed silica, and CaHPO 4 or Ca 10 (PO 4 ) 6 (OH) 2 Objective: To compare the physical prosperities of two bioactive dental materials, grey MTA (GMTA) and Biodentine and the effect of two developed accelerant formulations in form of aqueous suspensions on their setting time, pH, and compressive strength. Materials and Methods: Two types of cements were tested: GMTA, and Biodentine. These cements were mixed with either distilled water for GMTA or company liquid (GMTA-W, and Biodentine-CL), accelerant formulation L2 (GMTA-L2, and Biodentine-L2), or accelerant formulation L2-PO4 (GMTA-L2-PO4, and Biodentine-PO4). For pH measurement, 5 samples from each group were tested for 30 minutes from the start of the mix. For the setting time measurement 5 samples from each group were tested using a Gilmore needle apparatus. The compressive strength was tested on 10 samples from each group after 24 hours from the start of the mix. Comparisons between the experimental groups was performed using One-way ANOVA at a 5% level of significance and the non-parametric tests were performed using the Kruskal-Wallis test. Results: The two accelerant formulations did not affect setting pH for both tested materials, GMTA and Biodentine. Also there were no significant difference between GMTA-W and Biodentine-CL pH value. The final setting time of GMTA mixed with formulation L2 or L2-PO4 was significantly shorter than that mixed with distilled water (p < 0.00). In addition, Biodentine-CL showed significantly shorter final setting time than GMTA-W (p < 0.00). The compressive strength values of GMTA mixed with formulation L2 or L2-PO4 were significantly greater than that mixed with water (p < 0.00). Biodentine showed superior compressive strength values compared to all GMTA groups (p <0.00). Conclusion: Biodentine showed greater compressive strength values and shorter setting time compare to GMTA. The addition of formulation L2 or L2-PO4 to GMTA significantly reduced the setting time and increased the compressive strength. The addition of formulation L2 or L2-PO4 to Biodentine did not change the material physical prosperities tested.