Comparative Evaluation of Push out Bond Strength of Restorations with Bulk Fill, Flowable, and Conventional Resin Composite Restoration: An in vitro Study
Aim: The aim of this study was to evaluate the bond strengths of composite restorations made with different filler amounts and resin composites that were photo activated using a light-emitting diode (LED). Methodology: Thirty bovine incisors were selected, and a conical cavity was prepared in the facial surface of each tooth. All preparations were etched with 37% phosphoric acid, Te-Econom bond universal dental adhesive system was applied followed by photo activation, and the cavities were filled with a single increment of Tertic n cerem bulk, Smart dentin replacement (SDR) and Tetric N ceram nanohybrid, followed by photo activation. A push-out test to determine bond strength was conducted using a universal testing machine. Result: Data (MPa) were submitted to Student’s t-test at a 5% significance level. Among the three groups Conventional (5.86± 1.96) resin composite had a lower bond strength than the Bulk fill (6.53 ± 1.063) and Flowable (6.28± 1.085) resin composites ( p=0.014). After the test, the fractured specimens were examined using an optical microscope under magnification (10x). All the three composites demonstrated a high prevalence of adhesive failures (Conventional resin composite 90%; Bulk fill, 80%; and Flowable, 80%) Conclusion: Although all three composites demonstrated a high prevalence of adhesive failures, the bond strength values of the different resin composites photo activated by LED showed that the Tetric N Ceram nanohybrid had lower bond strength than the Tertic n cerem bulk fill and Smart dentin replacement flowable resin composites.