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Abstract
This study was conducted to evaluate the repair bond strength of dual-cured resin composite core materials compared to a light-cured resin composite one week or three months aging periods.
Materials and Methods: Thirty-six resin composite disks were prepared. The specimens were divided according to the core resin composite material into three main groups (n=12/group), Then, each group will be subdivided into two subgroups according to the pre-repair aging period. After aging, disks were bur roughened, etched with phosphoric acid followed by adhesive application. Repair resin composite was applied to the treated surfaces. Additional specimens were prepared to test their cohesive strength. Thereafter, all specimens were sectioned ending up with a total of 360 sticks and subjected to microtensile bond strength. Scanning electron microscopic (SEM) for mode of failure evaluation of repaired specimens was done.