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

Autor(es)

Marciano, Marina Angelica ^[1] ; Hungaro Duarte, Marco Antonio ^[1] ; Camilleri, Josette ^[2]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 32, n. 2, p. E30-E40, FEB 2016.
• Citações Web of Science: 18

Resumo

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)

• Processo FAPESP: 13/04054-8 - Análise da microestrutura e da interface de cimentos à base de silicato de cálcio contendo diferentes radiopacificadores
• Beneficiário: Marina Angélica Marciano da Silva
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 11/13573-3 - Propriedades físico-químicas e biológicas de cimento obturador experimental à base de Portland associado a diferentes radiopacificadores
• Beneficiário: Marina Angélica Marciano da Silva
• Modalidade de apoio: Bolsas no Brasil - Doutorado