Bonding Performance for Repairs Using Bulk Fill and Conventional Methacrylate Composites

Abstract

This study compared the bond strength of a composite repair made with a bulk fill composite and a conventional one using different surface treatments. Specimens were prepared as truncated cones (bases: 4 mm × 2 mm, height: 4 mm) using a bulk fill (OBFa: Filtek One) or a conventional resin (FTKa: Filtek Z250) (n = 66). They were artificially aged (10,000 cycles, 5°C–55°C, 30 sec) and subdivided according to surface treatments: NT—no treatment (control), Abr—abrasion with a diamond tip, and sand—sandblasting with aluminum oxide (50 μm). Treatments were performed over the smaller diameter surface, followed by adhesive (Scothbond Universal) application. A new specimen with similar dimensions was constructed over it using either the OBF or the FTK, totaling 12 groups (n = 11). Bond strength was assessed by tensile test. The data were submitted to two-way ANOVA separately for OBFa and FTKa, followed by Tukey’s test ( p < 0.05 ). For the aged OBFa groups, there was significant differences for composite type and surface treatment, with higher values of bond strength when repaired with the same material (OBFa/OBF > OBFa/FTK), and sandblasting and bur abrasion presented higher values compared to the control group (NT). For the aged FTKa groups, there were no differences for the composite or surface treatment. Therefore, the bulk fill resin composite tested present better repair performance when the same composite was used, while the conventional resin composite was less influenced by the material and the surface treatment performed.

The Effect of Aging by Acidic Solutions, that Simulate the Oral Conditions of Patients with Nervous Bulimia, on the Bond Strength of Repairs Influenced Using Different Bulk Fill and Nanoparticulate Composites

“…This finding is rather interesting considering the general recommendation to use the same material in repairs, based on past studies with conventional composites only. Moreover, studies have shown long-term problems such as recurrent caries and fractures in repairs using nanoparticulate composites [11,12]. Similar results were reported by Koc-Vural et al [13], showing that the combination of bulk fill composites with conventional composites was superior to repairs with similar composites.…”

The Effect of Mechanical Alteration on Repair Bond Strength of S-PRG-Filler-Based Resin Composite Materials

“…This unevenness in stress concentration can initiate a crack that propagates within the substrate/resin composite/bonding interface and cause monolithic fractures [ 19 , 20 ]. Nevertheless, several studies pertinent to the repair bond strength to resin composites have employed the SBS test [ 21 , 22 , 23 , 24 , 25 ].…”