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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 6
Affiliation:
[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
Total Affiliations: 5
Document type: Journal article
Source: Operative Dentistry; v. 39, n. 4, p. 389-397, JUL-AUG 2014.
Web of Science Citations: 1
Abstract

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)

FAPESP's process: 10/15076-4 - Influence of energy density on the physical properties and bond strength of two restorative systems
Grantee:Flávio Henrique Baggio Aguiar
Support Opportunities: Regular Research Grants
FAPESP's process: 10/05666-9 - Influence of energy density on the physical properties and bond strength of two restorative systems
Grantee:Anderson Catelan
Support Opportunities: Scholarships in Brazil - Doctorate