This file contains the Proceedings of the 20th International Academy of Periodontology and the 9th Malaysian Society of Periodontology Joint Biennial Scientific Conference 2025. The proceedings are organized into two main sections: Basic Science Scientific Posters and Clinical Scientific Posters. Basic Science Scientific Posters contains the topics: Pathways; Therapeutics; Biomaterials. Clinical Scientific Posters contains the topics: Clinical; Implant; Practice; Mucogingiva; Reviews; Aesthetics.