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The Scientific World Journal
Volume 2015 (2015), Article ID 452976, 5 pages
Research Article

Push-Out Bond Strength of Restorations with Bulk-Fill, Flow, and Conventional Resin Composites

Department of Restorative Dentistry, School of Dentistry, University of North Parana (UNOPAR), Rua Marselha 183, 86041-140 Londrina, PR, Brazil

Received 13 February 2015; Revised 19 August 2015; Accepted 6 September 2015

Academic Editor: Sema Belli

Copyright © 2015 Rodrigo Vieira Caixeta 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.


The aim of this study was to evaluate the bond strengths of composite restorations made with different filler amounts and resin composites that were photoactivated using a light-emitting diode (LED). Thirty bovine incisors were selected, and a conical cavity was prepared in the facial surface of each tooth. All preparations were etched with Scotchbond Etching Gel, the Adper Scotchbond Multipurpose Plus adhesive system was applied followed by photoactivation, and the cavities were filled with a single increment of Filtek Z350 XT, Filtek Z350 XT Flow, or bulk-fill X-tra fil resin composite (n = 10) followed by photoactivation. A push-out test to determine bond strength was conducted using a universal testing machine. Data (MPa) were submitted to Student’s t-test at a 5% significance level. After the test, the fractured specimens were examined using an optical microscope under magnification (10x). Although all three composites demonstrated a high prevalence of adhesive failures, the bond strength values of the different resin composites photoactivated by LED showed that the X-tra fil resin composite had a lower bond strength than the Filtek Z350 XT and Filtek Z350 XT Flow resin composites.