Halogen lamp and led activation of resin-modified glass ionomer restorative material. In vitro microhardness after long term storage

Cassoni, A; Macarini, P; Leonetti, E S; Shibli, J A; Rodrigues, J A (2011). Halogen lamp and led activation of resin-modified glass ionomer restorative material. In vitro microhardness after long term storage. European journal of paediatric dentistry, 12(3), pp. 150-154. Carimate: Ariesdue

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Preventive, Restorative and Pediatric Dentistry

UniBE Contributor:

De Almeida Rodrigues, Jonas

ISSN:

1591-996X

Publisher:

Ariesdue

Language:

English

Submitter:

Eveline Carmen Schuler

Date Deposited:

04 Oct 2013 14:16

Last Modified:

25 Jan 2017 12:16

PubMed ID:

22077680

Web of Science ID:

000295427500003

URI:

https://boris.unibe.ch/id/eprint/4449 (FactScience: 208661)

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