Document Detail


Free radical entrapment and crystallinity of resin composites after accelerated aging as a function of the expiration date.
MedLine Citation:
PMID:  24814184     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
This study evaluated the spin concentration and the crystallinity in different classifications of dental composites as a function of the material condition (new, aged and expired). Specimens were obtained according to the factors: composites: Filtek P60, Filtek Z250, Filtek Z350XT, and Filtek Silorane; and material conditions: new, aged, and expired. The syringe composites underwent an accelerated aging protocol (Arrhenius model). The magnetic properties of the composites were characterized using Electron Paramagnetic Resonance (EPR) and the concentration of spins (number of spins/mass) was calculated. The crystallinity of the composites tested was characterized with X-ray diffraction (XRD). Filtek P60 and Filtek Z250 presented similarities in terms of spin concentration and crystallinity, irrespective of the material condition. The aging protocol influenced the composite Filtek Z350XT that exhibited a significant increase in the spin concentration. Besides, lower intensity peaks of the organic matrix and amorphous silica were also observed for both aged and expired Filtek Z350XT. Although a significant lower spin concentration was observed for the silorane composite in comparison to that of the methacrylates, a decrease in the relative intensity of peaks of the amorphous region related to the organic components in the diffractograms was observed. The material conditions tested influence the crystallinity and the magnetic properties of the composites evaluated.
Authors:
Paulo Henrique Perlatti D'Alpino; Marcos Vinícius Gonçalves Vismara; Alejandra Hortencia Miranda González; Carlos Frederico de Oliveira Graeff
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-4-21
Journal Detail:
Title:  Journal of the mechanical behavior of biomedical materials     Volume:  36C     ISSN:  1878-0180     ISO Abbreviation:  J Mech Behav Biomed Mater     Publication Date:  2014 Apr 
Date Detail:
Created Date:  2014-5-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101322406     Medline TA:  J Mech Behav Biomed Mater     Country:  -    
Other Details:
Languages:  ENG     Pagination:  82-89     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Elsevier Ltd. All rights reserved.
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