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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Calcium silicate-based sealers: Assessment of physicochemical properties, porosity and hydration

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Marciano, Marina Angelica [1] ; Hungaro Duarte, Marco Antonio [1] ; Camilleri, Josette [2]
Total Authors: 3
[1] Univ Sao Paulo, Dept Dent, Dent Sch Bauru, BR-17012901 Bauru, SP - Brazil
[2] Univ Malta, Fac Dent Surg, Dept Restorat Dent, Msida - Malta
Total Affiliations: 2
Document type: Journal article
Source: Dental Materials; v. 32, n. 2, p. E30-E40, FEB 2016.
Web of Science Citations: 18

Objectives. Investigation of hydration, chemical, physical properties and porosity of experimental calcium silicate-based sealers. Methods. Experimental calcium silicate-based sealers with calcium tungstate and zirconium oxide radio-opacifiers were prepared by mixing 1 g of powder to 0.3 mL of 80% distilled water and 20% propylene glycol. MTA and MTA Fillapex were used as controls. The raw materials and set sealers were characterized using a combination of scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Physical properties were analyzed according to ANSI/ADA. The pH and calcium ion release were assessed after 3, 24, 72 and 168 h. The porosity was assessed using mercury intrusion porosimetry. Results. The analysis of hydration of prototype sealers revealed calcium hydroxide as a by-product resulting in alkaline pH and detection of calcium ion release, with high values in initial periods. The radiopacity was similar to MTA for the sealers containing high amounts of radio-opacifiers (p > 0.05). Flowability was higher and film thickness was lower for resinous MTA Fillapex sealer (p < 0.05). The test sealers showed water sorption and porosity similar to MTA (p > 0.05). Significance. The prototype sealers presented adequate hydration, elevated pH and calcium ion release. Regarding physical properties, elevated proportions of radio-opacifiers were necessary to accomplish adequate radiopacity, enhance flowability and reduce film thickness. All the tested sealers presented water sorption and porosity similar to MTA. (C) 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 11/13573-3 - Physicochemical and biological properties of experimental Portland-based sealer containing different radiopacifying agents
Grantee:Marina Angélica Marciano da Silva
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/04054-8 - Analysis of the dental discoloration with MTA and Portland cement using a bovine dental model
Grantee:Marina Angélica Marciano da Silva
Support type: Scholarships abroad - Research Internship - Doctorate