Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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Surface microhardness of three thicknesses of mineral trioxide aggregate in different setting conditions

  • Shokouhinejad, Noushin (Department of Endodontics, School of Dentistry and Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences) ;
  • Jafargholizadeh, Leila (School of Dentistry, Tehran University of Medical Sciences) ;
  • Khoshkhounejad, Mehrfam (Department of Endodontics, School of Dentistry and Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences) ;
  • Nekoofar, Mohammad Hossein (Department of Endodontics, School of Dentistry and Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences) ;
  • Raoof, Maryam (Department of Endodontics, School of Dentistry, Oral and Dental Diseases Research Center, Kerman University of Medical Sciences)
  • Received : 2014.03.29
  • Accepted : 2014.05.27
  • Published : 2014.11.29
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Abstract

Objectives: This study aimed to compare the surface microhardness of mineral trioxide aggregate (MTA) samples having different thicknesses and exposed to human blood from one side and with or without a moist cotton pellet on the other side. Materials and Methods: Ninety cylindrical molds with three heights of 2, 4, and 6 mm were fabricated. In group 1 (dry condition), molds with heights of 2, 4, and 6 mm (10 molds of each) were filled with ProRoot MTA (Dentsply Tulsa Dental), and the upper surface of the material was not exposed to any additional moisture. In groups 2 and 3, a distilled water- or phosphate-buffered saline (PBS)-moistened cotton pellet was placed on the upper side of MTA, respectively. The lower side of the molds in all the groups was in contact with human blood-wetted foams. After 4 day, the Vickers microhardness of the upper surface of MTA was measured. Results: In the dry condition, the 4 and 6 mm-thick MTA samples showed significantly lower microhardness than the 2 mm-thick samples (p = 0.003 and p = 0.001, respectively). However, when a distilled water- or PBS-moistened cotton pellet was placed over the MTA, no significant difference was found between the surface microhardness of samples having the abovementioned three thicknesses of the material (p = 0.210 and p = 0.112, respectively). Conclusions: It could be concluded that a moist cotton pellet must be placed over the 4 to 6 mm-thick MTA for better hydration of the material. However, this might not be necessary when 2 mm-thick MTA is used.

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References

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