The comparative evaluation of various additives on setting time and compressive strength of MTA Plus: An in vitro study

[摘要] Background and Objectives:  Mineral trioxide aggregate (MTA), being a near-ideal retrograde filling material, has the greatest disadvantage of longer setting time, which limits its use in a certain clinical situation. A novel MTA, known as MTA Plus, claims to have a finer particle size and is marketed with an additional anti-washout gel. This study was undertaken to compare the setting time and compressive strength (CS) of MTA Plus with various additives. Materials and Methodology:  MTA Plus powder was mixed with following additives such as 5% CaCl2 solution, 10% CaCl2 solution, phosphate-buffered saline, 80% distilled water/20% propylene glycol, saline, lidocaine HCl, 15% sodium phosphate monobasic, 3% sodium hypochlorite gel, and proprietary gel with MTA Plus in the ratio of 3:1 by weight. Setting time was evaluated using Vicat apparatus using a brass mold with an internal diameter of 10 mm and height of two millimeters. CS was evaluated using an Instron machine using a split brass mold with an internal diameter of Four millimeters and height of Six millimeters. Results:  The results showed that 15% sodium hydrogen phosphate and MTA Plus gel significantly decrease the setting time of MTA Plus. MTA Plus gel set cement gave the highest value of CS among all groups of additives studied. Interpretation and Conclusion:  Additives used in the given study had an influence on physical property like setting time and mechanical property like CS of MTA Plus.

[学科分类] 材料科学（综合）

[关键词] Additives;anti-washout gel;compressive strength;mineral trioxide aggregate Plus;setting time