Microhardness and fluoride release of restorative materials in different storage media

• Autor(a) principal: Silva, Kélio Garcia [UNESP]
• Data de Publicação: 2007
• Outros Autores: Pedrini, Denise [UNESP], Delbem, Alberto Carlos Botazzo [UNESP], Cannon, Mark
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/S0103-64402007000400007; http://hdl.handle.net/11449/70069
• topic: 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

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.