Document Detail

Halogen lamp and led activation of resin-modified glass ionomer restorative material. In vitro microhardness after long term storage.
MedLine Citation:
PMID:  22077680     Owner:  NLM     Status:  Publisher    
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/scm2). 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.
A Cassoni; P Macarini; E S Leonetti; J A Shibli; J A Rodrigues
Publication Detail:
Journal Detail:
Title:  European journal of paediatric dentistry : official journal of European Academy of Paediatric Dentistry     Volume:  12     ISSN:  1591-996X     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-11-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101121881     Medline TA:  Eur J Paediatr Dent     Country:  -    
Other Details:
Languages:  ENG     Pagination:  150-154     Citation Subset:  -    
School of Dentistry, Guarulhos University, Brazil -Assistant professors of the Dental Research and Graduate Studies Division, Department of Restorative Dentistry.
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