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Halogen lamp and led activation of resin-modified glass ionomer restorative material. In vitro microhardness after long term storage
Pubblication date: /1/2011
Authors: A. Cassoni*, P. Macarini**, E.S. Leonetti***,j.a. Shibli****, j.a. Rodrigues*
Institution: School of Dentistry, Guarulhos University, Brazil
*Assistant professors of the Dental Research
and Graduate Studies Division, Department of Restorative Dentistry
**Student of the Graduate Program
***Student of the Post-Graduate Program of Restorative Dentistry
****Assistant professor of the Dental Research
and Graduate Studies Division, Department of Periodontology
and Oral Implantodontology
Publication: European Journal of Paediatic Dentistry
Title: Halogen lamp and led activation of resin-modified glass ionomer restorative material. In vitro microhardness after long term storage
Abstract: Aim The purpose of this study was to evaluate the activation of resin-modified glass ionomer restorative material (RMGI, Vitremer-3M-ESPE, A3) by halogen lamp (QTH) or light-emitting diode (LED) by Knoop microhardness (KHN) in two storage conditions: 24hrs and 6 months and in two depths (0 and 2 mm).
Materials and methods The specimens were randomly divided into 3 experimental groups (n=10) according to activation form and evaluated in depth after 24h and after 6 months of storage. Activation was performed with QTH for 40s (700 mW/cm2) and for 40 or 20 s with LED (1,200 mW/cm2). After 24 hrs and 6 months of storage at 37°C in relative humidity in lightproof container, the Knoop microhardness test was performed.
Statistics Data were analysed by three-way ANOVA and Tukey post-tests (p<0.05).
Results All evaluated factors showed significant differences (p<0.05). After 24 hrs there were no differences within the experimental groups. KHN at 0 mm was significantly higher than 2 mm. After 6 months, there was an increase of microhardness values for all groups, being the ones activated by LED higher than the ones activated by QTH.
Conclusion Light-activation with LED positively influenced the KHN for RMGI evaluated after 6 months.