Table of Contents
ISRN Dentistry
Volume 2012, Article ID 898051, 4 pages
http://dx.doi.org/10.5402/2012/898051
Research Article

Compressive Strength and Setting Time of MTA and Portland Cement Associated with Different Radiopacifying Agents

1Department of Restorative Dentistry, Araraquara Dental School, São Paulo State University (UNESP), 14801-385 Araraquara, SP, Brazil
2Department of Dentistry, Bauru Dental School, University of São Paulo (USP), 17012-901 Bauru, SP, Brazil

Received 12 June 2012; Accepted 10 July 2012

Academic Editors: G. H. Sperber and J. Walters

Copyright © 2012 Mario Tanomaru-Filho 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.

Abstract

Objective. The aim of this study was to evaluate the compressive strength and setting time of MTA and Portland cement (PC) associated with bismuth oxide (BO), zirconium oxide (ZO), calcium tungstate (CT), and strontium carbonate (SC). Methods. For the compressive strength test, specimens were evaluated in an EMIC DL 2000 apparatus at 0.5 mm/min speed. For evaluation of setting time, each material was analyzed using Gilmore-type needles. The statistical analysis was performed with ANOVA and the Tukey tests, at 5% significance. Results. After 24 hours, the highest values were found for PC and PC + ZO. At 21 days, PC + BO showed the lowest compressive strength among all the groups. The initial setting time was greater for PC. The final setting time was greater for PC and PC + CT, and MTA had the lowest among the evaluated materials ( 𝑃 < 0 . 0 5 ). Conclusion. The results showed that all radiopacifying agents tested may potentially be used in association with PC to replace BO.