Bonding performance and mechanical properties of flowable bulk-fill and traditional composites in high c-factor cavity models
LeticiaVirginia Freitas Chaves, RodolfoXavier de Sousa Lima, Lucas José de Azevedo‐Silva, RobertaCaroline Bruschi Alonso, Saulo Geraldeli, Boniek Castillo Dutra Borges
Abstract
<b>Objectives:</b> The aim of this study is to evaluate bond strength (BS), shrinkage stress (SS), flexural strength (FS), and elastic modulus (<i>E</i>) of three flowable bulk fill in comparison with conventional composites.<br><b>Materials and Methods:</b> Three bulk fill (Filtek Bulk Fill Flow, Surefil SDR, X-tra Base) and three conventional composites (Filtek Z250 XT, Grandioso, Dentsply TPH3) were used. For BS, conical cavities (<i>n</i> = 10) were prepared in bovine dentine and restored with materials and were analyzed through push-out test in a universal testing machine (UTM). For FS/EM, 60 (<i>n</i> = 10) bar specimens (7 mm × 2 mm × 1 mm) were prepared and evaluated with a UTM. SS was measured in UTM coupled to an extensometer (<i>n</i> = 5). The data were statistically evaluated using one-way ANOVA/Tukey tests (<i>P</i> < 0.05).<br><b>Results:</b> Conventional composites showed higher <i>E</i> when compared to bulk-fill composites. Regarding FS, they showed similar results, except for (XBF) Xtra Bulk Fill that was inferior. SS and BS of bulk-fill composites were significantly lower and higher than conventional composites, respectively, except for XBF, which showed similar BS to conventional ones.<br><b>Conclusions:</b> Flowable bulk-fill composites, except XBF, showed higher BS, lower SS, similar FS, and lower <i>E</i> when compared to conventional ones.<br>