Objective To analyze the therapeutic effect of periodontal basic therapy on chronic periodontitis with diabetes mellitus. Methods 60 elderly patients with chronic periodontitis and diabetes mellitus were included in this study. These patients were divided into two groups by double-blind method. The control group were treated by self-intervention. The observation group were treated with periodontitis. PD,loss of attachment( AL),plaque index( PI),bleeding index( BOP),glycosylated hemoglobin( Hb),Hb A1 c,fasti...