Effect of universal adhesive application on bond strength of four-year aged composite repair

Abstract

Introduction Universal adhesives were introduced to provide faster adhesive application and a less technique-sensitive procedure, however, there is a dearth of studies in the literature about the use of Universal adhesives in composite repair techniques. Objective To evaluate the effect of universal adhesives systems on the shear bond strength (SBS) of fresh composite to four-year water-aged composite, simulating resin composite repair technique, after 24 h and one year of water storage. Material and Methods Thirty-six composite (Charisma, Kulzer) plates were fabricated and stored in distilled water at 37 °C for 4 years. The aged plates were sandblasted and assigned to the groups (n = 9): SMP: Silane (Ceramic Primer, 3 M Oral Care) + Adper Scotchbond Multi-Purpose Adhesive (3 M Oral Care – control); GBU: Gluma Bond Universal (Kulzer); ADU: Adhese Universal (Ivoclar Vivadent); SBU: Scotchbond Bond Universal (3 M Oral Care). Two fresh composites (Charisma, Kulzer) cylinders were constructed on each plate with the same composite and tested after 24 h or 1 year of water storage, using the MSBS testing. Data were analyzed by ANOVA and Tukey test (a = 0.05). Results At 24-hour evaluation time, there was no statistical difference among the bonding repair strategies. After one year of water storage, GBU exhibited the lowest bond strength outcome, while the other groups did not differ among them. Control, ADU, and SBU kept the bond strength values stable until one year. Conclusions The combination of sandblasting and ADU and SBU Universal adhesives presented the same outcome observed for the control and stable bond strength after 12-months of water storage.