Degree of conversion and hardness of two different systems of the vitrebond™ glass ionomer cement light cured with blue LED

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Data

2013-09-03

Autores

Calixto, Luiz Rafael
Tonetto, Mateus Rodrigues
Pinto, Shelon Cristina Souza
Barros, Erico Damasceno
Borges, Alvaro Henrique
Lima, Fabrício Viana Pereira
Andrade, Marcelo Ferrarezi de [UNESP]
Bandéca, Matheus Coelho

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Resumo

This study investigated the physicochemical properties of the new formulation of the glass ionomer cements through hardness test and degree of conversion by infrared spectroscopy (FTIR). Forty specimens (n = 40) were made in a metallic mold (4 mm diameter × 2 mm thickness) with two resin-modified glass ionomer cements, Vitrebond™ and Vitrebond™ Plus (3M/ ESPE). Each specimen was light cured with blue LED with power density of 500 mW/cm2during 30 s. Immediately after light curing, 24h, 48h and 7 days the hardness and degree of conversion was determined. The Vickers hardness was performed by the MMT-3 microhardness tester using load of 50 gm force for 30 seconds. For degree of conversion, the specimens were pulverized, pressed with KBr and analyzed with FT-IR (Nexus 470). The statistical analysis of the data by ANOVA showed that the Vitrebond™ and Vitrebond™ Plus were no difference significant between the same storage times (p > 0.05). For degree of conversion, the Vitrebond™ and Vitrebond™ Plus were statistically different in all storage times after light curing. The Vitrebond™ showed higher values than Vitrebond™ Plus (p < 0.05). The performance of Vitrebond™ had greater results for degree of conversion than Vitrebond™ Plus. The correlation between hardness and degree of conversion was no evidence in this study.

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Degree of conversion, Glass ionomer cement, Hardness.

Como citar

Journal of Contemporary Dental Practice, v. 14, n. 2, p. 244-249, 2013.