J Dent Res Dent Clin Dent Prospects. 2013;7(3):157-163.
doi: 10.5681/joddd.2013.025
PMID: 24082987
PMCID: PMC3779375
  Abstract View: 283
  PDF Download: 604

Original Research

Effect of Blood Contamination on Marginal Adaptation and Surface Microstructure of Mineral Trioxide Aggregate: A SEM Study

Article

Background and aims. In various clinical situations, mineral trioxide aggregate (MTA) may come into direct contact or even be mixed with blood. The aim of the present study was to evaluate the effect of exposure to blood on marginal adap-tation and surface microstructure of MTA. Materials and methods. Thirty extracted human single-rooted teeth were used. Standard root canal treatment was car-ried out. Root-ends were resected, and retrocavities were prepared. The teeth were randomly divided into two groups (n = 15): in group 1, the internal surface of the cavities was coated with fresh blood. Then, the cavities were filled with MTA. The roots were immersed in molds containing fresh blood. In group 2, the aforementioned procedures were performed ex-cept that synthetic tissue fluid (STF) was used instead of blood. To assess the marginaladaptation, "gap perimeter" and "maximum gap width" were measured under scanning electron microscope. The surface microstructure was also examined. Independent samples t-test and Mann-Whitney U test were used to analyze the data. Results. Maximum gap width and gap perimeter in the blood-exposed group were significantly larger than those in the STF-exposed group (p < 0.01). In the blood-exposed group, the crystals tended to be more rounded and less angular com-pared with the STF-exposed group, and there was a general lack of needle-like crystals. Conclusion. Exposure to blood during setting has a negative effect on marginal adaptation of MTA, and blood-exposed MTA has a different surface microstructure compared to STF-exposed MTA.
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Submitted: 19 Aug 2014
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