Department of Stomatology, the Second Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310009, China;
Department of Stomatology, the Second Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310009, China;
Department of Medical Microbiology and Parasitology, College of Medicine, Zhejiang University, Hangzhou 310006, China;
Department of Stomatology, the Affiliated Hospital of the School of Medicine, Ningbo University, Ningbo 315020, China;
Department of Oral and Maxillofacial Surgery, the Affiliated Hospital of Stomatology, College of Medicine, Zhejiang University, Hangzhou 310006, China;
Porphyromonas gingivalis; collagenase; cloning; cytokine; ELISA;