|Comparison of Mechanical and Physical Properties of White and Gray Mineral Trioxide Aggregate Useable in Dentistry|
|Mahdis Nesabi, Behzad Yasrebi|
|Department of Biomedical engineering Tabriz Branch, Islamic Azad University, Tabriz, Iran|
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Keywords : Composite resin, high-leucite, tensile strength, flexural strength
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Objective: Currently different materials are used asto obdurate tooth root canals. An ideal root canal filing material should have some specific properties, including biocompatibility, dimensional stability and insolubility.
Materials and Methods: One of the methods to evaluate these materials is to carry out solubility and microhardness tests. To this end, 20 Mineral Trioxide Aggregate samples were prepared for solubility test and 60 samples for microhardness test. Mineral Trioxide Aggregate (Angelus, Brazil) wasprepared based on manufacturer’s instructions by mixing a1:1 ratio of the powder and catalyst and placed in Teflon molds. The samples were storedin a room with a 95% relative humidity at 37°C for 390 minute (3 times longer than the setting time). The solubility of the materials was tested by immersing the samples in distilled water and measuring weight loss at 24-hour and 7-day intervals. The microhardness was determined with the use of Vickers test machine before and after immersion in Ringer’s solution at different intervals and the results were compared.
Results: The results showed that solubility of white Mineral Trioxide Aggregate after 1 day was similar to that of gray MTA; however, after 7 days, its solubility increased. There were no significant differences in microhardness on day 1 and on the subsequent days between white and gray Mineral Trioxide Aggregate (P<0.05).
Conclusion: There was no significant difference in the solubility of white and gray MTA at 24-hour interval; however, at 7-day interval, the solubility of WMTA was significantly higher than that of GMTA (with the solubility of both materials being <3%) In addition, there was no significant difference in micro hardness of white and gray MTA between the first day and other intervals (P<0.05).
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