Objective:To explore the therapeutic effect of photodynamic therapy(PDT)on patients with type Ⅱ diabetes mellitus and chronic periodontitis.Methods:Forty-eight patients with chronic periodontitis were randomly divided into PDT group(n=24)and control group(n=24)with and without PDT after supragingival scaling,and scaling and root planning(SRP).Levels of fasting blood glucose(FGP)and glycosylated hemoglobin(HbAle),and periodontal status were examined as well as matrix metalloproteinase-8(MMP-8)and interleukin...