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Quintessence Publishing: Journals: JAD

 

The Journal of Adhesive Dentistry

Edited by Prof. Dr. Roland Frankenberger, Prof. Bart Van Meerbeek

ISSN (print) 1461-5185 • ISSN (online) 1757-9988

Publication:

September/October 2015
Volume 17 , Issue 5



Pages: 427–432
PMID: 26525007
DOI: 10.3290/j.jad.a35012
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Bond Strength of a Flowable Bulk-fill Resin Composite in Class II MOD Cavities

Rose Yakushijin Kumagai / Leonardo Colombo Zeidan / Jose Augusto Rodrigues / André Figueiredo Reis / Jean-François Roulet

Purpose: To evaluate the microtensile bond strength (μTBS) of a bulk-fill low-stress resin-based composite to dentin from gingival walls of Class II MOD cavities.

Materials and Methods: Class II MOD cavities were prepared in 44 human molars with the distal and mesial proximal boxes 4 and 6 mm deep, respectively. Eight experimental groups (n = 11) were obtained by a factorial design including 1. “composite” in two levels: a bulk-fill low-stress composite (SureFil SDR Flow, Dentsply Caulk) and a conventional composite (Filtek Z350 XT, 3M ESPE); 2. “filling technique” in two levels: bulk-fill (Bf) and incremental (In); and 3. “depth” in two levels: 4 mm and 6 mm in order to create different polymerization conditions. Twenty-four hours after placement of restorations, teeth were sectioned into beams with a cross-sectional bonded area of approximately 1 mm2. Bonded beams obtained from the gingival walls of the proximal boxes were tested in tension at a crosshead speed of 1 mm/min. Data were submitted to a 3-way ANOVA followed by a post-hoc Tukey’s test (p < 0.05).

Results: ANOVA failed to identify significant differences for the triple and double interaction between factors. However, significant differences were observed for the factors “composite” and “filling technique” (p < 0.05). SDR presented significantly higher μTBS values for bulk and incremental filling techniques (p < 0.05), and the incremental filling technique presented significantly higher μTBS values for both composites (p < 0.05).

Conclusion: It can be concluded that the bulk-fill flowable composite SDR may improve the bond strength to the gingival walls of Class II MOD cavities.

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