water sorption of resin-modified glass-ionomer cements photoactivated with led sorção de água de cimentos de ionômero de vidro modificados por resina fotoativados com led

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ID: 195957
2006
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Abstract
The Light Emitting Diodes (LED) technology has been used to photoactivate composite resins and there is a great number of published studies in this area. However, there are no studies regarding resin-modified glass-ionomer cements (RMGIC), which also need photoactivation. Therefore, the aim of this study was to evaluate water sorption of two RMGIC photoactivated with LED and to compare this property to that obtained with a halogen light curing unit. A resin composite was used as control. Five specimens of 15.0 mm in diameter x 1.0 mm in height were prepared for each combination of material (Fuji II LC Improved, Vitremer, and Filtek Z250) and curing unit (Radii and Optilight Plus) and transferred to desiccators until a constant mass was obtained. Then the specimens were immersed into deionized water for 7 days, weighed and reconditioned to a constant mass in desiccators. Water sorption was calculated based on weight and volume of specimens. The data were analyzed by two-way ANOVA and Tukey test (p < 0.05). Specimens photocured with LED presented significantly more water sorption than those photocured with halogen light. The RMGIC absorbed statistically significant more water than the resin composite. The type of light curing unit affected water sorption characteristics of the RMGIC.
A tecnologia baseada em Diodos emissores de luz (LED) tem sido utilizada para a fotoativação de resinas compostas e existe um grande número de estudos publicados a este respeito. Entretanto, não existem estudos envolvendo cimentos de ionômero de vidro modificados por resina (CIVMR), que também necessitam fotoativação. Assim, o objetivo deste estudo foi o de avaliar a sorção de água de dois CIVMR fotoativados com LED e comparar essa propriedade com aquela obtida com unidade com lâmpada halógena. Uma resina composta foi utilizada como controle. Cinco espécimes com 15,0 mm diâmetro x 1,0 mm de altura foram preparados para cada combinação de material (Fuji II LC Improved, Vitremer e Filtek Z250) e fonte de luz (Radii e Optilight Plus) e transferidos a dessecadores até a obtenção de massa constante. Em seguida, os espécimes foram imersos em água deionizada por 7 dias, pesados e recondicionados a uma massa constante em dessecadores. A sorção de água foi calculada com base no peso e no volume dos espécimes. Os dados foram analisados por ANOVA a dois critérios e teste de Tukey (p < 0,05). Os espécimes fotoativados com LED apresentaram maior sorção de água que os fotoativados com lâmpada halógena. Os CIVMR absorveram mais água que a resina composta. O tipo de unidade de fotoativação afetou as características de sorção de água dos CIVMR.
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Authors ;Daniela Francisca Gigo Cefaly;Linda Wang;Liliam Lucia Carrara Paes de Mello;Janaína Lima dos Santos;Jean Rodrigo dos Santos;José Roberto Pereira Lauris
Journal journal of information and computational science
Year 2006
DOI
10.1590/S1806-83242006000400011
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-83242006000400011
Keywords
water glass ionomer cements

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