Effect of light curing unit on resin-modified glass-ionomer cements: a microhardness assessment
AUTOR(ES)
Cefaly, Daniela Francisca Gigo, Mello, Liliam Lucia Carrara Paes de, Wang, Linda, Lauris, José Roberto Pereira, D'Alpino, Paulo Henrique Perlatti
FONTE
Journal of Applied Oral Science
DATA DE PUBLICAÇÃO
2009-06
RESUMO
OBJECTIVE: To evaluate the microhardness of resin-modified glass-ionomer cements (RMGICs) photoactivated with a blue light-emitting diode (LED) curing light. MATERIAL AND METHODS: Thirty specimens were distributed in 3 groups: Fuji II LC Improved/GC (RM1), Vitremer/3M ESPE (RM2) and Filtek Z250/ 3M ESPE (RM3). Two commercial light-curing units were used to polymerize the materials: LED/Ultrablue IS and a halogen light/XL3000 (QTH). After 24 h, Knoop microhardness test was performed. Data were submitted to three-way ANOVA and Tukey's test at a pre-set alpha of 0.05. RESULTS: At the top surface, no statistically significant difference (p>0.05) in the microhardness was seen when the LED and QTH lights were used for all materials. At the bottom surface, microhardness mean value of RM2 was significantly higher when the QTH light was used (p<0.05). For RM1, statistically significant higher values (p<0.05) were seen when the LED light was used. No statistically significant difference (p>0.05) was seen at the bottom surface for RM3, irrespective of the light used. Top-to-bottom surface comparison showed no statistically significant difference (p>0.05) for both RMGICs, regardless of the light used. For RM3, microhardness mean value at the top was significantly higher (p<0.05) than bottom microhardness when both curing units were used. CONCLUSION: The microhardness values seen when a LED light was used varied depending on the restorative material tested.
Documentos Relacionados
- Effect of a resin-modified glass-ionomer with calcium on enamel demineralization inhibition: an in vitro study
- Effect of resin-modified glass-ionomer cement lining and composite layering technique on the adhesive interface of lateral wall
- Influence of thicknesses of smear layer on the transdentinal cytotoxicity and bond strength of a resin-modified glass-ionomer cement
- Effect of etching and light-curing time on the shear bond strength of a resin-modified glass ionomer cement
- Fluoride release profile of a nanofilled resin-modified glass ionomer cement