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COMPARATIVE ESTIMATION OF LEVEL OF TNF- ? IN GINGIVAL CREVICULAR FLUID AND BLOOD SERUM IN PATIENT WITH CHRONIC PERIODONTITIS BEFORE AND AFTER SCALING AND ROOT PLANING: A BIOCHEMICAL STUDY. ijmsdr. 2019;3(10). Accessed October 6, 2026. https://www.ijmsdr.com/index.php/ijmsdr/article/view/501