With the following goals: Comment on clinical, X-ray of stage IV chronic periodontitis according to AAP of a group of patients at Hanoi Central Odontostomatology Hospital from 2016-2019; Evaluation of surgical treatment results for chronic periodontitis using enamel matrix derivatives - Emdogain on the control group of patients. | MINISTRY OF EDUCATION AND MINISTRY OF TRAINING HEALTH HANOI MEDICAL UNIVERSITY DONG THI MAI HUONG CLINICAL OUTCOMES AFTER SURGICAL TREATMENT OF CHRONIC PERIODOTAL WITH ENAMEL MATRIX DERIVATIVES- EMDOGAIN Specialty Odontostomatology Number 62720601 SUMMARY OF . THESIS HANOI - 2021 THIS RESEARCH WAS PERFORMED AT HANOI MEDICAL UNIVERSITY Supervisors 1. Prof. Trinh Dinh Hai 2. . Nguyen Thi Hong Minh Reviewer 1 Assoc. Prof. Dr. Pham Thi Thu Hien Reviewer 2 Assoc. Prof. Dr. Le Thi Thu Ha Reviewer 3 Assoc. Prof. Dr. Tong Minh Son Thesis will be defended in front of the University Thesis Evaluation Council Organized in Hanoi Medical University At on 2021 This thesis can be found at 1. Vietnam National Library 2. Library of Hanoi Medical University PUBLISHED RESEARCHES THAT ARE RELEVANT TO CONTENT OF THIS THESIS 1. Dong Thi Mai Huong 2020 . Clinical Outcomes After Sugery Treatment Of Chronic Periodotal With Enamel Matrix Derivatives- Emdogain. Medical Research Journal 132 8 . 45-54. 2. Dong Thi Mai Huong Trinh Đinh Hai Nguyen Thi Hong Minh 2020 . Clinical X-Ray Characteristics And Treatment Results Of Chronic Periodontis Surgery. Medical Research Journal 135 11 . 197-204. 1 A. INTRODUCTION RATIONALE OF THIS THESIS Periodontitis is a common disease of the Odontostomatology. The disease occurs in all ages and countries all over the world accounted for a high proportion in the community and of a social nature. In the USA research by Walter et al showed that the rate of periodontitis in the community is 25-41 . In Vietnam according to the 2001 National Oral Health Survey the percentage of people with gingivitis and periodontitis up to 90 of which the rate of people with periodontitis at the age of 35- 44 is at the age of 45 and over is . Up till now the treatment of periodontitis is still facing many difficulties because of the complication of the disease and their pathogenesis there is no specific treatment but treatment for periodontitis includes a complex