Effect of Phosphoric Acid Etching Duration on Direct Resin-Based Composite Restorations in Permanent Anterior Teeth

In both study arms, permanent dental restorations are made with resin-based composite in permanent anterior teeth. Both study arms will use identical materials for the resin-based composite restoration (Tetric Plus Flow and Tetric Plus Fill) and universal adhesive (Adhese Universal), with the only difference being the duration of the phosphoric acid etching step. All other aspects of the restorative procedure, such as isolation of the operative field, application techniques, and final polishing, will remain consistent across both arms.