Comparative Assessment of Microleakage at Enamel–Adhesive and Bracket–Adhesive Interfaces of Orthodontic Brackets Bonded with Three Adhesive Systems: An In Vitro Study

One of the main reasons for microleakage is polymerization shrinkage of resin-based adhesives, which produces tiny spaces that allow oral fluids and microbes to enter.Furthermore, IntroductIonFixed appliance orthodontic treatment has gained broad recognition as an effective way of enhancing both function and esthetics while treating malocclusion.The successful adhesion of orthodontic brackets to enamel surfaces is a major factor in the effectiveness of such therapy.Resin-modified glass ionomer cements (RMGICs), composite resins, and more recent self-etching solutions are just a few of the adhesive methods that have been developed over the course of time to improve binding strength while reducing negative effects on enamel. 1 Microleakage is still a major clinical problem despite improvements in adhesive materials.The movement of microorganisms, liquids, ions, and molecules between the bonded contact and the tooth surface is known as microleakage.This phenomenon can happen at two crucial interfaces in orthodontics: the adhesive-bracket contact and the enamel-adhesive interface.Enamel demineralization, discoloration, white spot lesions, and even secondary caries under or around orthodontic brackets can result from microleakage. 2