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    The effect of melatonin and vitamin C treatment on the experimentally induced tympanosclerosis: study in rats
    (Assoc Brasileira Otorrinolaringologia & Cirurgia Cervicofacial, 2017) Koc, Sema; Kiyici, Halil; Toker, Aysun; Soyalic, Harun; Aslan, Huseyin; Kesici, Hakan; Karaca, Zafer I.
    Introduction: The ethiopathogenesis of tympanosclerosis has not been completely under-stood yet. Recent studies have shown that free oxygen radicals are important in the formation of tympanosclerosis. Melatonin and Vitamin C are known to be a powerful antioxidant, interacts directly with Reactive Oxygen Species and controls free radical-mediated tissue damage. Objective: To demonstrate the possible preventative effects of melatonin and Vitamin C on tympanosclerosis in rats by using histopathology and determination of total antioxidant status total antioxidant status. Methods: Standard myringotomy and standard injury were performed in the middle ear of 24 rats. The animals were divided into three groups: Group 1 received melatonin, Group 2 received vitamin C, and Group 3 received saline solution. Results: The mean values of total antioxidant status were similar in the all study groups before the treatment period. The mean values of total antioxidant status were significantly higher in the melatonin and vitamin C groups compared to control group but vitamin C with melatonin groups were similar after the treatment period (p < 0.001). Minimum and maximum wall thicknesses were lower in the melatonin and vitamin C groups compared to the control group but the differences were insignificant. Conclusion: Melatonin increases total antioxidant status level and might have some effect on tympanosclerosis that develops after myringotomy. (C) 2016 Associacao Brasileira de Otorrinolaringologia e Cirurgia Cervico-Facial. Published by Elsevier Editora Ltda.