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The authors had studied on the 541 cases of periodontal operation in 239 patients visited in dept. of piriodontics, K. M. C. during the period of Oct. 1971 to Dec. 1974 from a statistical observation in relation to age, six, location, frequency and kinds of operation. The results were as follows: 1. In the 239 patients, 30-39 age group was 75(31. 4%), the highest distribution, 20-29 age group 60(25.1%), 40-49 age group 40 (16.7%), 10-19 age group 34 (14. 2%) and 50-59 age group 23 (9.6%). Of these, 102 were males and 139 females, showing the ratio of 1:1.34. 2. The average age of the patients was 35.8 in male and 31. 6 in female. 3. Of the 541 cases of operations, the flap operations were 411(76.0%), the highest distribution, the gingivictomiis 110(20.3%) and the others (frinic tomy, himisictomy, graft) 20(3.7%). 4. Of the flap operations, 30-39 age group revealed 37. 5%, the highest distrib ution and sexual distribution showed 41. 9% in male and 58. 1% in female, and of the gingivictomiis, 10-19 age group revealed 47.3%, the highest distribution and sexual distribution showed 33.6% in male and 66.4% in female. 5. Of the location of the operation, upper was higher than lower (1.35:1) and in upper, antiriors showed 26.3%, premolars 15.9% and molars 15.3%, and in lower, antiriors 20.3%, molars 11.2% and premolars 11.0%. 6. The average frequency of operation per one was 2.19.
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