Dr Calvin Kurnia A SURGICAL INTERVENTION FOR PERSISTENT PERIAPICAL LESION AND EXTERNAL ROOT RESORPTION *Calvin Kurnia, DDS. (Indonesia) **Ovilya Septy Hutami Pasaribu, DDS. Under supervision from ***Dr. drg. Ira Komara, Sp.Perio(K) *Resident of Periodontology, University of Padjadjaran, Bandung **Resident of Conservative Dentistry, University of Padjadjaran, Bandung ***Lecturer of Periodontology, University of Padjadjaran, Bandung Chief Complaints: Female (51 y.o.) initially felt tenderness in left central incisor while biting a food and slight mobile, after root canal treatment patient was reffered to…