Ayan, GizemMisilli, TugbaBuldur, MehmetDogan, Ayse Nur2026-02-032026-02-0320250287-4547https://doi.org/10.4012/dmj.2025-046https://hdl.handle.net/20.500.12428/34408The study evaluated the effects of postoperative bleaching with HP and CP on microtensile bond strength (mu TBS) and nanoleakage of composite restorations using total-/self-etch protocols. Sixty incisors with Black V cavities were restored using a multimode adhesive in total-/self-etch mode and resin composite. Samples were divided into five groups: control, CPx2, CPx5, HPx2, HPx5. After bleaching, 1x1x8 mm composite blocks (n=10) were tested for mu TBS, and failure types were assessed. Two samples per group were analyzed for nanoleakage via scanning electron microscope (SEM). Two-way analysis of variance, Bonferroni correction, and stepwise linear regression were applied. CPx5 and HPx5 groups exhibited significantly reduced mu TBS compared to control, and the self-etch protocol resulted in lower values regardless of bleaching method. Regression analysis confirmed significant effects of adhesive (total-etch) and bleaching (CPx5, HPx5). A significant relationship was found between failure modes and bleaching methods for each adhesive protocol, with adhesive failures being the most frequent. SEM revealed nanoleakage in all groups.eninfo:eu-repo/semantics/openAccessAdhesionIntracoronal bleachingMicrotensile bond strengthNanoleakageArticle44510.4012/dmj.2025-046Q2WOS:0015896685000142-s2.0-10501778780940866242Q2