IADR Abstract Archives
Shear Bond Strength of Different Bulk Fill Composite/Adhesive Systems
Objectives: New generations of dental resin composites labeled as “bulk-fill” composites have been introduced to the marketplace and are becoming increasingly popular due to the reduced and simplified clinical placement procedures, allowing for thicker increment placement. This study compared the shear bond strength (SBS) of the adhesion formed between three commercially available bulk-fill composites, their recommended adhesive, and dentin.
Methods: Eighteen extracted human molars were sectioned mesial-distally, embedded in acrylic cylinders with the cut surface exposed, and polished with an Eco-Met 250 Polisher Grinder (Buehler, Lake Bluff, IL), finishing with P1200, P2500, and P4000 grit discs. Samples were randomly divided into six groups as listed in Table 1. Each composite was bonded with the adhesive recommended by the manufacturer, and prepared according to manufacturer instructions. A cylinder (2.38 mm diameter and 2 mm height) of each material was applied to the dentin surface using an Ultradent jig (Ultradent Products, South Jordan, UT) and light polymerized according to manufacturer instructions using a Valo (Ultradent Products, South Jordan, UT) LED curing light. Half of the samples were immediately tested, the remained were aged in water for 24 hours (37°C) prior to testing. Samples (N=6 each group) underwent SBS testing using an Ultradent testing jig with an ElectroPuls E3000 (Instron, Norwood, MA) (crosshead speed = 0.5mm/min). SBS data were compared using ANOVA and post-hoc Tukey (α=0.05).
Results: Within immediate groups, A and B performed similarly and achieved a significantly higher bond strength than group C. After 24 hour storage, group E was significantly higher than both D and F, while the difference between groups D and F was insignificant. Within each manufacturer, immediate and aged groups were compared, and only groups B and E were significantly different.
Conclusions: 24 hour aging did not adversely affect bond strengths, and Filtek SBS increased over the time tested.
Methods: Eighteen extracted human molars were sectioned mesial-distally, embedded in acrylic cylinders with the cut surface exposed, and polished with an Eco-Met 250 Polisher Grinder (Buehler, Lake Bluff, IL), finishing with P1200, P2500, and P4000 grit discs. Samples were randomly divided into six groups as listed in Table 1. Each composite was bonded with the adhesive recommended by the manufacturer, and prepared according to manufacturer instructions. A cylinder (2.38 mm diameter and 2 mm height) of each material was applied to the dentin surface using an Ultradent jig (Ultradent Products, South Jordan, UT) and light polymerized according to manufacturer instructions using a Valo (Ultradent Products, South Jordan, UT) LED curing light. Half of the samples were immediately tested, the remained were aged in water for 24 hours (37°C) prior to testing. Samples (N=6 each group) underwent SBS testing using an Ultradent testing jig with an ElectroPuls E3000 (Instron, Norwood, MA) (crosshead speed = 0.5mm/min). SBS data were compared using ANOVA and post-hoc Tukey (α=0.05).
Results: Within immediate groups, A and B performed similarly and achieved a significantly higher bond strength than group C. After 24 hour storage, group E was significantly higher than both D and F, while the difference between groups D and F was insignificant. Within each manufacturer, immediate and aged groups were compared, and only groups B and E were significantly different.
Conclusions: 24 hour aging did not adversely affect bond strengths, and Filtek SBS increased over the time tested.
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