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

• Autor(a) principal: Calixto, Luiz Rafael
• Data de Publicação: 2013
• Outros Autores: 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
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.5005/jp-journals-10024-1307; http://hdl.handle.net/11449/76518
• topic: Degree of conversion; Glass ionomer cement; Hardness.

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.