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

Autor(es)

Catelan, A. ^[1] ; Pollard, T. ^[2] ; Bedran-Russo, A. K. ^[3] ; dos Santos, P. H. ^[4] ; Ambrosano, G. M. B. ^[5] ; Aguiar, F. H. B. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba - Brazil

^[2] Univ Illinois, Coll Engn, Dept Mech & Ind Engn, Chicago, IL - USA

^[3] Univ Illinois, Dept Restorat Dent, Coll Dent, Chicago, IL - USA

^[4] Sao Paulo State Univ, Aracatuba Sch Dent, Dept Dent Mat & Prosthodont, Aracatuba - Brazil

^[5] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Social Dent Stat, Piracicaba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Operative Dentistry; v. 39, n. 4, p. 389-397, JUL-AUG 2014.
• Citações Web of Science: 1

Resumo

The 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. (AU)

• Processo FAPESP: 10/15076-4 - Influência da densidade de energia nas propriedades físicas e resistência de união de dois sistemas restauradores
• Beneficiário: Flávio Henrique Baggio Aguiar
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/05666-9 - Influência da densidade de energia nas propriedades físicas e resistência de união de dois sistemas restauradores
• Beneficiário: Anderson Catelan
• Modalidade de apoio: Bolsas no Brasil - Doutorado