Periodontitisli hastalarda başlangıç ve cerrahi periodontal tedavinin tükürük 8-OHdG (8-hydroxy-deoxyguanosine) seviyesi değişimiyle ilişkisinin incelenmesi. The evaluation of the relationship between the change in the level of saliva 8-OHdG (8-hydroxy-deoxyguanosine) and initial and surgical periodontal therapy in periodontitis patients.