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Volume 2018, Article ID 7136345, 11 pages
https://doi.org/10.1155/2018/7136345
Research Article

Different Setting Conditions Affect Surface Characteristics and Microhardness of Calcium Silicate-Based Sealers

1Department of Conservative Dentistry, College of Dentistry, Gangnam Severance Hospital, Yonsei University, 211 Eonju-ro, Gangnam-gu, Seoul 135-720, Republic of Korea
2Department of Conservative Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 120-752, Republic of Korea
3Department of Conservative Dentistry and Oral Science Research Center, College of Dentistry, Gangnam Severance Hospital, Yonsei University, 211 Eonju-ro, Gangnam-gu, Seoul 135-720, Republic of Korea

Correspondence should be addressed to Su-Jung Shin; ca.shuy@nihsgnujus

Received 20 June 2017; Accepted 9 December 2017; Published 16 January 2018

Academic Editor: Sacha Gómez

Copyright © 2018 Dong-Kyu Yang 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. To investigate the effect of different setting conditions on surface microhardness and setting properties of calcium silicate-based sealers. Methods. Three sealers, EndoSequence Bioceramic (BC; Brasseler USA, Savannah, GA, USA), Endoseal MTA (ES; Maruchi, Wonju, Korea), and Well-Root ST (WR; Vericom, Chuncheon, Korea), were compared. Specimens were exposed to either butyric acid (pH 5.4) or phosphate-buffered saline (PBS [pH 7.4]) for 48 h and stored at 100% humidity for 12 days. The control specimens were stored at 100% humidity for 14 days. Surface microhardness was measured, topographic changes were observed, and phase analysis was performed using X-ray diffraction. Microhardness according to storage conditions was compared using one-way analysis of variance and Tukey’s multiple comparison tests (). Results. The BC and ES sealers exhibited decreased microhardness when stored in acid or PBS compared with control (). In the WR group, acid exposure lowered microhardness of the specimens compared with control (). Scanning electron microscopy revealed different topographies in specimens from all tested sealers exposed to acid or PBS. Conclusion. The surface microhardness of calcium silicate-based sealers was reduced by exposure to either acid or PBS. Acid solutions, however, had a more detrimental effect than PBS.