The effects of different ratios of water-to-powder on the porosity, microleakage, and strength properties of mineral trioxide aggregate
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Mineral Trioxide Aggregate (MTA) was developed initially as a root end filling material.Through extensive research by Torabinejad and others it has been recognized as a superior product for retrograde filling material. MTA has many qualities that may render it an ideal material. Those characteristics are the fact that MTA is biocompatible, allows for cementum to growth, and it's minimal microleakage compared to those of amalgam and IRM (Interim Restorative Material) have been proven time after time. The purpose of this experiment was to see if different water-to-powder ratios of MTA have an impact on its porosity, microleakage, and strength characteristics. The tested samples were 25%, 30%, 35%. Water to powder ratio. The same sets of experiments were then followed with an addition of 10% Bioactive lnorganic Eiement (BIE), and the control 33% of experimental MTA (EMTA).The samples were tested after 1 day, 1 week, 3 weeks, and 1 month of setting time. Our experiment showed that more water does create a more porous final product. After one month of setting time there was a significant difference between 25% EMTA and the control of 33% EMTA (control) p[less than]0.0001. The control had higher strength. There was significant difference between 35% EMTA and 33% EMTA (control) p[less than]0.05. The 35% EMTA samples had lower strengths. Addition of 10% BIE to the mixture of EMTA made the overall strength of the material lower. There were significant differences between 33% BIE + EMTA and 33% EMTA p[less than]0.05. Higher strength was observed by the control group. The leakage was also tested and there were significant results after 1 month in samples of 25% EMTA compared to 33% EMTA (control) p[less than]0.0001. 25% EMTA demonstrated greater leakage. Addition of BIE also had significant results in the 25% EMTA + BIE compared to 33% EMTA + BIE. The 25% BIE showed more leakage. Under the conditions of these experiments it seems that different water-to-powder ratios can affect the strength and microleakage. However, these results may not alter MTA characteristics in vivo since plenty of moisture can be obtained from the body.
PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact firstname.lastname@example.org.Dissertation (MSD) --Boston University, Henry M. Goldman School of Dental Medicine, 2010 (Department of Endodontics).Includes bibliographic references: leaves 139-143.
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