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Molecules 2016, 21(2), 233; doi:10.3390/molecules21020233

Influence of Thermal Treatment Conditions on the Properties of Dental Silicate Cements

1
Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Material Science, Politehnica University of Bucharest, 1-7 Gh. Polizu Street, Bucharest RO-011061, Romania
2
Department of Fetal and Adult Stem Cell Therapy, Nicolae Simionescu Institute of Cellular Biology and Pathology of Romanian Academy, 8 B.P. Hasdeu Street, Bucharest RO-050568, Romania
*
Author to whom correspondence should be addressed.
Academic Editor: Alexandru Mihai Grumezescu
Received: 25 January 2016 / Revised: 9 February 2016 / Accepted: 13 February 2016 / Published: 18 February 2016
(This article belongs to the Special Issue Pharmaceutical Nanotechnology: Novel Approaches)
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Abstract

In this study the sol-gel process was used to synthesize a precursor mixture for the preparation of silicate cement, also called mineral trioxide aggregate (MTA) cement. This mixture was thermally treated under two different conditions (1400 °C/2 h and 1450 °C/3 h) followed by rapid cooling in air. The resulted material (clinker) was ground for one hour in a laboratory planetary mill (v = 150 rot/min), in order to obtain the MTA cements. The setting time and mechanical properties, in vitro induction of apatite formation by soaking in simulated body fluid (SBF) and cytocompatibility of the MTA cements were assessed in this study. The hardening processes, nature of the reaction products and the microstructural characteristics were also investigated. The anhydrous and hydrated cements were characterized by different techniques e.g., X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (FT-IR) and thermal analysis (DTA-DTG-TG). The setting time of the MTA cement obtained by thermal treatment at 1400 °C/2 h (MTA1) was 55 min and 15 min for the MTA cement obtained at 1450 °C/3 h (MTA2). The compressive strength values were 18.5 MPa (MTA1) and 22.9 MPa (MTA2). Both MTA cements showed good bioactivity (assessed by an in vitro test), good cytocompatibility and stimulatory effect on the proliferation of cells. View Full-Text
Keywords: mineral trioxide cement; composition; thermal treatment; hydration and hardening processes; properties; setting time; biocompatibility mineral trioxide cement; composition; thermal treatment; hydration and hardening processes; properties; setting time; biocompatibility
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Voicu, G.; Popa, A.M.; Badanoiu, A.I.; Iordache, F. Influence of Thermal Treatment Conditions on the Properties of Dental Silicate Cements. Molecules 2016, 21, 233.

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