Light-curing Time and Aging Effects on the Nanomechanical Properties of Methacrylate- and Silorane-based Restorations

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Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorCatelan, A.-
Autor(es): dc.creatorPollard, T.-
Autor(es): dc.creatorBedran-Russo, A. K.-
Autor(es): dc.creatorSantos, Paulo Henrique dos-
Autor(es): dc.creatorAmbrosano, G. M. B.-
Autor(es): dc.creatorAguiar, F. H. B.-
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Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionProcesso FAPESP: 10/05666-9-
Descrição: dc.descriptionProcesso FAPESP: 10/15076-4-
Descrição: dc.descriptionThe aim of this study was to assess the influence of light-curing time on the nanohardness (H) and reduced elastic modulus (E-r) of components (underlying dentin, hybrid layer, adhesive, and composite) of methacrylate- and silorane-based restorations after 24 hours and six months of storage. Class II slot preparations were carried out in human molars (n=3) and restored with methacrylate (Clearfil SE Bond [Kuraray] + Filtek Z250 [3M ESPE]) or silorane (LS restorative system [3M ESPE]) restorative systems and light-cured using light-emitting diode at 1390 mW/cm(2) for the recommended manufacturers' time or double time. Restorations were sectioned, and bonded dentin-resin interfaces were embedded in epoxy resin and polished for evaluation with a Berkovich fluid cell tip (TI 700 Ubi-1 nano-indenter, Hysitron). Data were statistically analyzed by analysis of variance and Tukey's test (alpha=0.05). Overall, the H and E-r values were higher for methacrylate-based restorations than for silorane materials (p <= 0.05), an increase in curing time did not improve the H and E-r of the bonded interface components of either material (p>0.05), and aging significantly decreased the mechanical properties of interface components of both resin-based restorative systems (p <= 0.05). In general, nanomechanical properties decreased after six months of storage, the methacrylate restorative system exhibited higher H and E-r than silorane, and light-curing time did not influence the properties tested.-
Formato: dc.format389-397-
Idioma: dc.languageen-
Publicador: dc.publisherOperative Dentistry Inc-
Relação: dc.relationOperative Dentistry-
Relação: dc.relation2.130-
Relação: dc.relation1,180-
Direitos: dc.rightsopenAccess-
Título: dc.titleLight-curing Time and Aging Effects on the Nanomechanical Properties of Methacrylate- and Silorane-based Restorations-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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