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Evaluation of the effect of blood contamination on the compressive strength of MTA modified with hydration accelerators
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Kaveh Oloomi, Eshaghali Saberi, Hadi Mokhtari, Hamid Reza Mokhtari Zonouzi, Ali Nosrat, Mohammad Hossein Nekoofar, Paul Michael Howell Dummer
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Restor Dent Endod 2013;38(3):128-133. Published online August 23, 2013
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DOI: https://doi.org/10.5395/rde.2013.38.3.128
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 Abstract
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- Objectives
This study was performed to evaluate the effect of blood contamination on the compressive strength (CS) of Root MTA (RMTA) modified with Calcium chloride (CaCl2) and Disodium hydrogen phosphate (Na2HPO4) as setting accelerators over time. Materials and MethodsA total of 110 cylindrical specimens of RMTA were divided into 6 experimental groups as follows: Group1, RMTA; Group 2, RMTA modified with CaCl2 (RMTA-C); Group 3, RMTA modified with Na2HPO4 (RMTA-N); Group 4, RMTA contaminated with blood; Group 5, RMTA-C contaminated with blood; Group 6, RMTA-N contaminated with blood. The CS of specimens in all groups was evaluated after 3 hr, 24 hr, and 1 wk. In the modified groups (groups 2, 3, 5, and 6) the CS of five specimens per group was also evaluated after 1 hr. ResultsBlood contamination significantly reduced the CS of all materials at all time intervals (p < 0.05). After 3 hr, the CS of specimens in the RMTA groups (with and without blood contamination) was significantly lower than those in the RMTA-C and RMTA-N groups (p < 0.05). The CS values were not significantly different at the other time intervals. In all groups, the CS of specimens significantly increased over time (p < 0.05). ConclusionsBlood contamination decreased the CS of both original and accelerated RMTA.
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Citations
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