ABSTRACT Introduction: Plaque accumulation and bond failure are drawbacks of orthodontic treatment. which requires composite for bonding of brackets. As the antimicrobial properties of TiO2 nanoparticles (NPs) have been proven. the aim of this study was to evaluate the antimicrobial and mechanical properties of composite resins modified by the addition of TiO2 NPs. https://www.roamingfreesims.com/product-category/ip-66-led-batten/