Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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Evaluation of the effect of blood contamination on the compressive strength of MTA modified with hydration accelerators

  • Oloomi, Kaveh (Department of Endodontics, Tehran University of Medical Sciences School of Dentistry) ;
  • Saberi, Eshaghali (Department of Endodontics, Zahedan University of Medical Sciences Faculty of Dentistry) ;
  • Mokhtari, Hadi (Dental and Periodontal Research Center, Department of Endodontics, Tabriz University of Medical Sciences Faculty of Dentistry) ;
  • Mokhtari Zonouzi, Hamid Reza (Department of Endodontics, Zahedan University of Medical Sciences Faculty of Dentistry) ;
  • Nosrat, Ali (Iranian Center for Endodontic Research, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences) ;
  • Nekoofar, Mohammad Hossein (Department of Endodontics, Tehran University of Medical Sciences School of Dentistry) ;
  • Dummer, Paul Michael Howell (Endodontology Research Group, Cardiff University School of Dentistry, College of Biomedical and Life Sciences)
  • Received : 2013.04.15
  • Accepted : 2013.06.16
  • Published : 2013.08.30
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Abstract

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 ($CaCl_2$) and Disodium hydrogen phosphate ($Na_2HPO_4$) as setting accelerators over time. Materials and Methods: A total of 110 cylindrical specimens of RMTA were divided into 6 experimental groups as follows: Group1, RMTA; Group 2, RMTA modified with $CaCl_2$ (RMTA-C); Group 3, RMTA modified with $Na_2HPO_4$ (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. Results: Blood 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). Conclusions: Blood contamination decreased the CS of both original and accelerated RMTA.

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References

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