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Abstract
Objective: To assess microtensile bond strength (MTBS) of bulk-fill resin-composites in high configuration-factor cavity preparations. Methods: Non-carious 48 sound human molars were selected and divided into two equal groups. Occlusal surfaces of the first group were ground flat to expose superficial dentin below the occlusal surface. Flat 2.5-mm thick coronal slabs were obtained from the second group and cemented to occlusal surfaces of first group. Teeth were prepared (5mm mesio-distal x4mm bucco-lingual x4mm deep), randomly divided into two main equal groups, according to the adhesive system utilized (etch-and-rinse and self-etch technique), and further subdivided into 6 equal subgroups according to restorative protocol (3 per main group). First subgroup was restored with bulk-fill flowable composite and an increment of resin composite. Second subgroup was restored with a single increment of bulk-fill composite, while third subgroup was restored incrementally using resin composite restorative material. Bonding and restoration were done according to manufacturer instructions followed by serial sectioning into 0.9x0.9mm thick beams (n=16/subgroup) field emission scanning electron microscope)