Microleakage effect of in-office bleaching on two types of nanohybrid composites with or without surface sealer.

Background: Bleaching is a highly common method used nowadays to treat tooth discolouration because it is a significant cosmetic issue, particularly with anterior teeth, however bleaching itself results in microleakage.

Objective: This study aims to evaluate the impact of in-office bleaching on class V restoration microleakage with type 1 and type 2 composite restorations.

Methods: Three hundred and twenty healthy, caries-free removed human anterior teeth were used in this in-vitro study.