Comparison of subgingival ultrasonic scaling with hand scaling in the treatment of chronic periodontitis / 实用口腔医学杂志

80 patients with chronic periodontitis were randomly divided into 2 groups(n =40)and treated by ultrasonic sub-gingival sealing (ultrasonic group)and hand instrumentation(hand group)respectively.4 and 12 weeks after treatment,plaque index(PLI),gingival blee-ding index(GBI),probing pocket depth(PD)and clinical attachment level(CAL)of both groups decreased(P 0.05).