Objective:To observe the clinical effects of ultrasonic subgingival scaling with Yin Ju Qing Chi Lu on treatment of chronic periodontitis. Method:A total of thirty cases of patients with chronic periodontitis were included in the study.Bilateral first molars of each patients were choosed,Split-mouth design assigned into the experimental group(Yi Ju Qing Chi Lu group)and control group(distilled water group). Record before and 4 weeks after treatment PLI、BOP、PD、AL and compare the change of IL-6 in gingival cr...