Microhardness and fluoride release of restorative materials in different storage media
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Coadvisor
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Undergraduate course
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FapUNIFESP (SciELO)
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Article
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Acesso aberto
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Abstract
This study evaluated the surface microhardness and fluoride release of 5 restorative materials - Ketac-Fil Plus, Vitremer, Fuji II LC, Freedom and Fluorofil - in two storage media: distilled/deionized water and a pH-cycling (pH 4.6). Twelve specimens of each material, were fabricated and the initial surface microhardness (ISM) was determined in a Shimadzu HMV-2000 microhardness tester (static load Knoop). The specimens were submitted to 6- or 18-h cycles in the tested media. The solutions were refreshed at the end of each cycle. All solutions were stored for further analysis. After 15-day storage, the final surface microhardness (FSM) and fluoride release were measured. Fluoride dose was measured with a fluoride-specific electrode (Orion 9609-BN) and digital ion analyzer (Orion 720 A). The variables ISM, FSM and fluoride release were analyzed statistically by analysis of variance and Tukey's test (p<0.05). There was significant difference in FSM between the storage media for Vitremer (pH 4.6 = 40.2 ± 1.5; water = 42.6 ± 1.4), Ketac-Fil Plus (pH 4.6 = 73.4 ± 2.7; water = 58.2 ± 1.3) and Fluorofil (pH 4.6 = 44.3 ± 1.8; water = 38.4 ± 1.0). Ketac-Fil Plus (9.9 ± 18.0) and Fluorofil (4.4 ± 1.3) presented higher fluoride release in water, whereas Vitremer (7.4 ± 7.1), Fuji II LC (5.7 ± 4.7) and Freedom (2.1 ± 1.7) had higher fluoride release at pH 4.6. Microhardness and fluoride release of the tested restorative materials varied according to the storage medium.
Description
Keywords
Dental material , Fluoride , Hardness , In vitro , pH-cycling , acetic acid derivative , anticaries agent , biomedical and dental materials , buffer , calcium , compomer , fluoride , Freedom Compomer , Fuji II LC cement , glass ionomer , Ketac Fil , Ketac-Fil , maleic acid derivative , phosphorus , resin , trometamol , unclassified drug , Vitremer , water , chemistry , diffusion , hardness , human , ion selective electrode , materials testing , pH , surface property , Acetates , Buffers , Calcium , Cariostatic Agents , Compomers , Composite Resins , Dental Materials , Diffusion , Fluorides , Glass Ionomer Cements , Humans , Hydrogen-Ion Concentration , Ion-Selective Electrodes , Maleates , Materials Testing , Phosphorus , Resins, Synthetic , Surface Properties , Tromethamine , Water
Language
English
Citation
Brazilian Dental Journal, v. 18, n. 4, p. 309-313, 2007.
