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: 24 hrs 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 24 h and after 6 months of storage. Activation was performed with QTH for 40s (700 mW/cm) and for 40 or 20 s with LED (1,200 mW/cm2). After 24 hrs and 6 months of storage at 37 degrees C in relative humidity in light-proof 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.

journal_name

Eur J Paediatr Dent

authors

Cassoni A,Macarini P,Leonetti ES,Shibli JA,Rodrigues JA

subject

Has Abstract

pub_date

2011-09-01 00:00:00

pages

150-4

issue

3

eissn

1591-996X

issn

2035-648X

journal_volume

12

pub_type

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