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    Shear Bond Strength of Aged Composite Restorations Repaired with a Universal Injectable Composite
    (Pera Yayincilik Hizmetleri, 2019) Gonulol, Nihan; Almasifar, Lena; Cabadag, Ozge Gizem; Misilli, Tugba; Kalyoncuoglu, Elif
    Objective: The purpose of this study was to analyze the shear bond strength of a universal injectable composite used in the repair of aged composites. Methods: A total of 100 disk-shaped specimens (8 mmx2 mm) were produced using five different composites (n=20) (Gradia Direct Posterior, Tetric N Ceram BulkFill, Filtek Z250, SonicFill and Filtek BulkFill Posterior). Specimens were polymerized using an LED light curing unit for 20 s and stored at 37 degrees C in distilled water for 3 weeks. Specimens were subdivided into two groups per composite for repair using either the same composite used for the specimen or G-aenial Universal Flo. Following acid-etching and silane application, a universal adhesive (G-Premio BOND) was applied and light-cured. The repair materials were placed on the bonded surfaces of the specimens and polymerized in silicone molds (2 mmx2 mm). After thermocycling to simulate aging, shear bond strength (SBS) was tested using a universal testing machine at a crosshead speed of 1 mm/min. Failure modes were examined using a stereomicroscope at x40 magnification. Results: No statistically significant differences were found among the tested composites repaired with their own substrates. However, the SBS SonicFill and Filtek Bulk Fill Posterior groups had significantly lower bond strengths when repaired with G-aenial Universal Flo in comparison to repairs made with their own substrates (p<0.05). Conclusion: When repaired with their own substrates, reliable bond strengths were obtained for all the composites tested.
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    The effect of curing lights and modes on dentin bond strength of bulk-fill composites applied in different thickness
    (Taylor & Francis Ltd, 2019) Misilli, Tugba; Gonulol, Nihan; Cabadag, Ozge Gizem; Almasifar, Lena; Misilli, Umut
    To investigate shear bond strength (SBS) to dentin of a conventional and three bulk-fill composites applied in different increment thickness and cured by mono- and multi-wave LED LCUs. Two hundred and fifty-two extracted sound human molars were prepared for SBS test. The teeth were divided into four groups according to the resin composites used. Conventional composite: Tetric N-Ceram (control); high-viscosity bulk-fills: Tetric N-Ceram Bulk Fill, X-tra Fil, and SonicFill. Each group was subdivided (n = 7) according to increment thickness (2, 4, and 6 mm) and cured by standard mode of a mono-wave LED or two different modes (standard and xtra power) of a multi-wave LED. The failure mode was stereomicroscopically determined at 40x magnification. Data were analyzed using Three-way ANOVA and further comparisons were assessed by Bonferroni's multiple comparison test. There were no significant differences within X-tra fil and Tetric N-Ceram Bulk Fill groups for any of the variables (p > 0.05). A significant decrease in SBS values with increase of layer thickness was observed for SonicFill and control groups. Also, curing mode had a significant effect on both composites at 6 mm thickness and standard mode of multi-wave LED caused the highest SBS value (p < 0.05). Adhesive failure was the most common fracture pattern especially at 6 mm thickness applications. Based on the results of this study, the bulk-fill composites can be safely applied in one-step with 4 mm increments, although the examined composites performed better at 2 mm thickness. The performance of the composites at 6 mm increment may show differences related to the curing lights and modes.