Please use this identifier to cite or link to this item: http://repositorio.unitau.br/jspui/handle/20.500.11874/2992
metadata.dc.type: Artigo de Periódico
Title: Effect of preheating and light-curing unit on physicochemical properties of a bulk fill composite
Authors: Theobaldo, Jessica Dias
Aguiar, Flávio Henrique Baggio
Pini, Nubia Inocencya Pavesi
Lima, Debora Alves Nunes Leite
Liporoni, Priscila Christiane Suzy
Catelan, Anderson
Abstract: Objective: The aim of this study is to evaluate the effect of composite preheating and polymerization mode on degree of conversion (DC), microhardness (KHN), plasticization (P), and depth of polymerization (DP) of a bulk fill composite. Methods: Forty disc-shaped samples (n = 5) of a bulk fill composite were prepared (5 x 4 mm thick) and randomly divided into 4 groups according to light-curing unit (quartz-tungstenhalogen [QTH] or light-emitting diode [LED]) and preheating temperature (23 or 54 degrees C). A control group was prepared with a flowable composite at room temperature. DC was determined using a Fourier transform infrared spectrometer, KHN was measured with a Knoop indenter, P was evaluated by percentage reduction of hardness after 24 h of ethanol storage, and DP was obtained by bottom/top ratio. Data were statistically analyzed by analysis of variance and Tukey's test (alpha = 0.05). Results: Regardless of light-curing, the highest preheating temperature increased DC compared to room temperature on bottom surface. LED showed a higher DC compared to QTH. Overall, DC was higher on top surface than bottom. KHN, P, and DP were not affected by curing mode and temperature, and flowable composite showed similar KHN, and lower DC and P, compared to bulk fill. Conclusion: Composite preheating increased the polymerization degree of 4-mm-increment bulk fill, but it led to a higher plasticization compared to the conventional flowable composite evaluated.
metadata.dc.language: Inglês
metadata.dc.publisher.country: Nova Zelândia
Publisher: Dove Medical Press Ltd
metadata.dc.rights: Em verificação
metadata.dc.identifier.doi: 10.2147/CCIDE.S130803
URI: http://repositorio.unitau.br/jspui/handle/20.500.11874/2992
Issue Date: 2017
Appears in Collections:Artigos de Periódicos

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