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Hatta, L. I.; Dharmautama, M.; Amiruddin, M.; Habar, I. D. The Change of Tissue of Inhibitor Metalloproteinase 1 (timp-1) After Rosella (hibiscus Sabdariffa) Extract Gel Application on Artificial Crown Patients With Gingivitis. J Dentomaxillofac Sci 2019, 4, 39-43.