Repair bond strength of aged resin composite using different surface treatments and bonding protocols

Background: Repair of direct composites are less invasive than replacement, diminishing the risk iatrogenic exposure pulp and detrimental to adjacent teeth, all in all, reducing procession “restoration death spiral”. Aim: This study aimed evaluate repair bond strength aged resin using different surface treatments bonding protocols. Materials Methods: A total 45 discs (n=45) were fabricated Nanohybrid composite measuring about 2.5 mm height 3.5 diameter mounted acrylic subjected 10,000 thermal cycles between 5-55 ? C with 30 seconds dwell time a thermocycler order simulate artificial ageing. All these samples assigned into three groups (n=15) based on treatment protocol. According protocol, each group further divided subgroups (n=5). After composites, application agent followed by new material was performed. stored distilled water at 37 for 24 hours. The shear measured universal testing machine crosshead speed 1mm/min. Results: Among groups, mean medium grain diamond bur 37% phosphoric acid etchant subgroup higher 852.56±27.71 remaining groups. lowest 200.9±10.62 observed in 37% Etchant subgroup. Conclusion: Different combinations protocols affect differently. highest values achieved where done combination blue along agent.