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BioMed Research International
Volume 2013, Article ID 469164, 7 pages
Research Article

Removal of White Mineral Trioxide Aggregate Cement: A Promising Approach

1Department of Ophthalmology and Visual Sciences, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
2Bioscience Research Center, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN, USA
3Department of Restorative Sciences, Baylor College of Dentistry, Texas A&M University System Health Science Center, Dallas, TX, USA
4Kamal Asgar Research Center (KARC) and Dental School, Tehran, Iran
5Research Center for Pharmaceutical Nanotechnology and Department of Endodontics, Dental Faculty, Tabriz University (Medical Sciences), Tabriz, Iran
6Private practice, Tehran, Iran

Received 25 April 2013; Revised 2 August 2013; Accepted 8 August 2013

Academic Editor: Ali Abdalla

Copyright © 2013 Mohammad Ali Saghiri et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Removal of MTA from dentin by applying 37% hydrochloric acid (HCl) to reduce microhardness and push-out bond strength. Forty dentin slices were filled with WMTA and divided into two groups ( ). Ten slices remained untreated while others were exposed to either HCl or phosphate buffer saline (PBS) and all samples were subjected to pushout test. The mode of bond failures was determined by SEM analysis. Later, twenty glass tubes were filled with WMTA and divided into two groups ( ). One side of tube was exposed to HCl or PBS while the other side remained untreated and the microhardness was analyzed by testing machine. HCl showed significantly lower pushout strength and microhardness values ( ), ( ). HCl treated samples showed mixed bond failures dominantly, while PBS samples mostly showed adhesive failures. The results of this study can suggest the 37% HCl as an effective solution to aid the removal of MTA from the dentin surfaces.