Journal of Endodontics
Volume 29, Issue 12 , Pages 814-817, December 2003

Mineral Trioxide Aggregate (MTA) Solubility and Porosity with Different Water-to-Powder Ratios

  • Marcela Fridland, DDS

      Affiliations

    • Corresponding Author InformationAddress requests for reprints to Dr. Marcela Fridland, Wheelwright 1921 P. 12, Rosario, Argentina
    • ,
  • Rafael Rosado, CHEM ENG

Marcela Fridland is affiliated with the Endodontics Department and Instructor in the Graduate Program of Endodontics of the National University Of Buenos Aires, Argentina. Rafael Rosado is a Chemical Engineer and Professor in IMAE (Instituto de Mecánica Aplicada y Estructuras, Institute of Applied Mechanics and Structures) School of Engineering, National University of Rosario, Argentina.

This study tested mineral trioxide aggregate (MTA) solubility and porosity with different water-to-powder proportions. The study also determined the chemical composition of the salts dissolved by MTA. Four sets of specimens using the following water-to-powder proportions were prepared: 0.26, 0.28, 0.30, and 0.33 grams of water per gram of cement. The latter is the ratio recommended by the manufacturer. It was determined that the degree of solubility and porosity increased as the water-to-powder ratio increased. Significant differences were found among the sets of specimens. The chemical analyses of the salts dissolved by MTA in the water identified the presence of calcium as the main chemical compound. The pH level of the solution was highly alkaline, ranging between 11.94 and 11.99. It can be stated that the calcium found in the solution should be in its hydroxide state at this high pH level. This ability to release calcium hydroxide could be of clinical significance because it could be related to the proven capacity of MTA to induce mineralization.

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 The donation of Pro Root MTA by Tulsa Dentsply used in this study is gratefully acknowledged. The authors thank Dr. Beatriz Maresca, Professor, Endodontics Department, National University of Buenos Aires, for her assistance. This research is part of Dr. Marcela Fridland’s PhD thesis. Dr. Beatriz Maresca is the thesis director. The authors thank Dr. Don Arens, Associate Professor, Department of Endodontics, Indiana University School of Dentistry, for his comments and critical review of this manuscript. The authors also thank Dr. Irene Luppi for her statistical analysis of this study.

PII: S0099-2399(05)60381-0

doi:10.1097/00004770-200312000-00007

Journal of Endodontics
Volume 29, Issue 12 , Pages 814-817, December 2003

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