Comparison of microleakage of Unite and Resilience adhesive under metallic brackets

Abstract

The polymerization shrinkage of the adhesive material may cause gap formation between the adhesive material and enamel surface and lead to microleakage , thus permitting the passage of bacteria and oral fluids from the oral cavity and facilitating the formation of white spot lesions around and under the bracket surface area. Decreased clinical chair time of no-mix adhesives compared to visible light cure are brands of no-mix adhesives is a great advantage. Unite and Resilience adhesives that is widely used in Iran. The purpose of this study was to evaluate and compare microleakage of Unite and Resilience composite under metallic brackets. Material Method: sixty bovine incisors were randomly divided into two groups and metallic brackets bonded to the teeth by Unite and Resilience adhesives. Then the samples were thermocycled and dyed with fuchsin basic 0.5% for 24 hours. The specimens were sectioned and microleakage from the occlusal and gingival margins was determined by stereomicroscope at the enamel-adhesive and brackets-adhesive interfaces. Statistical analyses were performed using Wilcoxon and Mann-Whitney U tests. Results: The gingival side of both groups showed higher microleakage scores compared with the occlusal side for both adhesive interfaces. Microleakage scores were higher between the enamel-adhesive than adhesive-bracket interfaces. When the adhesive system was compared, there were no significant differences between two groups. Conclusion: There were no significant differences between Unite and Resilience adhesives. The gingival side and adhesive-enamel interface exhibited higher microleakage.