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CC BY-NC-ND 4.0 · European Journal of General Dentistry 2019; 8(02): 36-40
DOI: 10.4103/ejgd.ejgd_14_19
Original Article

Bulk-fill versus conventional composite: A comparative analysis on degree of conversion

Fernanda Ferreira de Albuquerque Jassé
Department of Restorative Dentistry, Araraquara School of Dentistry, Araraquara, Brazil
,
Hélida Gomes de Oliveira Barud
Department of Restorative Dentistry, Araraquara School of Dentistry, Araraquara, Brazil
,
Juliana Maria Capelozza Boaventura
Department of Restorative Dentistry, Araraquara School of Dentistry, Araraquara, Brazil
,
Cristiane de Melo Alencar
Department of Restorative Dentistry, Araraquara School of Dentistry, Araraquara, Brazil
,
Alexandre Gatti
1   Araraquara Chemistry Institute, University of São Paulo – UNESP, Araraquara, Brazil
,
Edson Alves de Campos
Department of Restorative Dentistry, Araraquara School of Dentistry, Araraquara, Brazil
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Abstract

Aim: This study aimed to determine the degree of conversion (DC) of two resin-based composites: a conventional nanohybrid composite and a bulk-fill flowable composite (SureFil® SDR™ flow). Materials and Methods: DC was evaluated at 1-, 2-, 3-, and 4-mm depths at varying irradiation times (20 and 40 s) by Fourier-transform infrared spectroscopy. Disc-shaped specimens of varying depths were prepared and photoactivated with a third-generation light-emitting diode light-curing unit. The specimens were stored for 24 h in the dark at ambient temperature and pulverized into a fine powder which was mixed with potassium bromide. After homogenization, the mixture pressed to form a pellet. All pellets were evaluated by an infrared spectrometer equipped with a triglycine sulfate detector using diffuse reflectance. The percentage of monomer conversion was determined from the ratio of the absorbance intensities of the aliphatic carbon–carbon double bonds (C = C) and the internal standard before and after the curing of the composite, represented by the aromatic carbon–carbon single bonds (C-C). Results: The DC data for the bulk-fill resin showed no significant difference (P > 0.05) for different irradiation depths, whereas for the conventional nanohybrid resins, statistical analyses revealed a significant result of the variables time and depth as well as the interaction between them. Conclusions: The results indicated that SDR™ achieves a 4-mm depth of cure with both 20- and 40-s light exposures.

Keywords

Bulk-fill flowable - composite resins - degree of conversion

Financial support and sponsorship

This study was financially supported by the Coordination of Improvement of Higher Education Personnel of the Brazilian Government.




Publication History

Article published online:
01 November 2021

© 2019. European Journal of General Dentistry. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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