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

 Dong-Kyu Yang  ;  Sunil Kim  ;  Jeong-Won Park  ;  Euiseong Kim  ;  Su-Jung Shin 
 SCANNING, Vol.2018 : 7136345, 2018 
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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 (P < .05). Results: The BC and ES sealers exhibited decreased microhardness when stored in acid or PBS compared with control (P < .05). In the WR group, acid exposure lowered microhardness of the specimens compared with control (P < .05). 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.
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2. College of Dentistry (치과대학) > Dept. of Conservative Dentistry (보존과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Sun Il(김선일) ORCID logo https://orcid.org/0000-0002-8889-9844
Kim, Eui Seong(김의성) ORCID logo https://orcid.org/0000-0003-2126-4761
Park, Jeong Won(박정원) ORCID logo https://orcid.org/0000-0002-2517-8150
Shin, Su Jung(신수정) ORCID logo https://orcid.org/0000-0001-5795-3919
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