This study aims to construct and systematically evaluate a multifunctional synergistic drug delivery system based on a hyaluronic acid-nanoclay composite hydrogel to achieve integrated treatment of periodontitis encompassing "infection control, inflammation regulation, and bone regeneration promotion." Through material design, in vitro functional validation, and in vivo efficacy evaluation, the study will elucidate the intrinsic relationships and synergistic mechanisms among "material structure, controlled drug release, and biological effects" within this system, thereby providing a theoretical basis and experimental foundation for the development of smart periodontal regenerative materials with clinical translational potential.