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International Journal of Dentistry - Volume 2017 2017, Article ID 3483171, 6 pages - https:-doi.org-10.1155-2017-3483171

Research ArticleDepartment of Restorative Dentistry, São Paulo State University UNESP, Institute of Science and Technology, São José dos Campos, SP, Brazil

Correspondence should be addressed to Eduardo Bresciani

Received 17 December 2016; Revised 14 March 2017; Accepted 2 May 2017; Published 22 May 2017

Academic Editor: Sema Belli

Copyright © 2017 Rafael Santos Rocha et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The purpose of this study was to evaluate the effect of aging protocols on surface gloss of composites. Cylindrical resin composite specimens 6 mm in diameter, 1 mm thick were fabricated and divided into three groups : microfilled MiFi, nanohybrid NaHy, and nanofilled NaFi. Specimens were distributed into four aging subgroups: thermocycling 5° to 55°C, 15,000 cycles; ethanol immersion 15 days; brushing 10,750 cycles; and light aging 216 h. Surface gloss readings Novo-Curve, Rhopoint TM, England were performed at baseline R0 and after every one-third of aging protocols R1 to R3. Data were submitted to one-way repeated measures ANOVA and Tukey’s test 5%. Overall, surface gloss alterations were detected over time . Thermocycling reduced surface gloss, except for NaHy. Ethanol immersion resulted in surface gloss reduction after R1 for MiFi and NaFi, while reduction after R1 and R2 was detected for NaHy. For brushing, gloss reduction was detected after R1 and R3 for all composites. For light aging, gloss was reduced after R1 and R2 for MiFi and NaFi, while a reduction only after R1 was detected for NaHy. The studied aging protocols affect surface gloss differently, being material and aging therapy dependent. In general, the surface gloss is reduced with aging.





Autor: Rafael Santos Rocha, Amanda Carvalho Oliveira, Taciana Marco Ferraz Caneppele, and Eduardo Bresciani

Fuente: https://www.hindawi.com/



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