This study was carried out to know the state of Periodontal surgery cases which were performed in our clinic. From the study, the following results were obtained. 1. Sum of the operative cases during one year ( 1985) were 162 cases (98 males and 64 females) and the average of patient's age was 45.8 years old. 2. The relation between the progress of the periodontitis and the operated cases were as follows. Mild ( periodontitis) : 14.4%, Modelate: 50.6% and Severe: 35.0% 3. On the purpose of

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... operations, the elimination of periodontal pockets and improvement of furcation involvements occupied 88% of the cases. On the other hand, improvement of mucogingival problems are 8.1% of the cases. 4. On the classification of these operations, the flap operation was 70.4% (114 cases) . In the flap operation, apically repositioned flap operation comprised 57 cases and modified widman flap operation comprised 52 cases. The operation for the furcation involvement was 17.9% (29 cases) , and hemisection procedure was dominant. 5. Before these operation, the reevaluation was performed to 68.8% of the cases. From the results of preoperating evaluation, 20% or less of the plaque control record was 87.4% and 20% or less of the bleeding index was 86.6%. The pocket depth of the performed operation was predominantly 5mm.