Assessment of Fluoridated Orthodontic Adhesive: Exploring Fluoride Release, Rechargeability, and Their Influence on Shear Bond Strength in Intact Tooth Surfaces

The current study aimed to investigate the fluoride release from light-cured orthodontic adhesive resin over various time intervals, examine the rechargeability potential of the resin, and evaluate its influence on shear bond strength in intact tooth surfaces. Materials and Methods: In this study, 30 recently extracted upper premolar teeth were used for orthodontic treatment. The teeth were divided into three main groups to investigate fluoride release at specific time intervals: one day, one week, and one month. Within each time interval, subgroups were established, with one subgroup receiving a fluoride recharge through the application of a fluoride varnish. Subsequently, fluoride release and shear bond strength measurements were conducted on these samples. The samples were stored in 5 ml of deionized water, and for the recharging groups, fluoride varnish was applied and stored in an additional 5 ml of deionized water. The quantification of total solubilized fluoride was performed using a fluoride-selective electrode, while shear bond strength was evaluated using a Universal testing machine. Statistical analysis of the collected data was carried out using SPSS software version 22. Results: The month after group exhibited the highest mean values for both fluoride release and shear bond strength. Moreover, the study identified significant variations in fluoride release and shear bond strength across the different groups investigated. Conclusions: The utilization of fluoride varnish in the vicinity of the orthodontic bracket exhibits a favorable impact on the bracket's shear bond strength.