Assessment of dye penetration at composite - repair interface: Effect of application of bonding agent and comparison of two different bonding systems: An in vitro study

Introduction: Reparability of defects / fractures restricted to the bulk of the composite restoration is a highly desirable property, as being less time consuming and cost effective. This study was aimed to evaluate the microleakage at the composite repair interface following surface treatment and application of the bonding agent and compared the microleakage following application of two different bonding systems at the composite repair interface. Material and Methods: Sixty composite resin specimens (Filtek Z350, 3M Dental Products) aged in distilled water for 1 week, were divided into four groups (n = 15) based on surface treatment and application of bonding agent. All the groups then received new resin applications using same composite resin. The samples were then thermocycled (200 cycles/50C to 550C{±2}) and immersed overnight in aqueous methylene blue dye solution. Single examiner carried out dye penetration analysis using stereomicroscope. Results: Mann-Whitney U-Test (p