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RETRACTED ARTICLE:Melatonin promotes angiogenesis during repair of bone defects: a radiological and histomorphometric study in rabbit tibiae

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This article was retracted on 03 January 2022

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Abstract

Objectives

The pineal gland hormone, melatonin, is an immunomodulator and neuroendocrine hormone; it also stimulates monocyte, cytokine and fibroblast proliferations, which influence angiogenesis. The aim of this study was to investigate the effects of melatonin on angiogenesis during bone defect repair by means of radiological and histomorphometric evaluations of bone response to melatonin implants.

Materials and methods

Twenty New Zealand rabbits weighing 3,900–4,500 g were used. Twenty melatonin implants were inserted in the proximal metaphyseal area of the animals' right tibia and 20 control areas were located in the left proximal metaphyseal area. Following implantation, the animals were sacrificed in groups of five, after 1, 2, 3 and 4 weeks, respectively. Anteroposterior and lateral radiographs were taken, and radiographic thermal imaging analysis was performed for all groups at different time stages following implant insertion. Samples were sectioned at 5 μm and stained using Hematoxylin–Eosin and Masson's trichrome, supplementing radiographic findings with histomorphometric analysis.

Results

After 4 weeks, radiological images showed complete repair of the bone defects. No healed or residual bone alterations attributable to the presence of the melatonin implant were observed. Histomorphometric analysis at 4 weeks showed the presence of a higher density newly formed bone. There were statistically significant differences in the length of cortical formation between the melatonin group and the control group during the first weeks of the study; there were also statistically significant differences in the number of vessels observed in the melatonin groups at the first two study stages.

Conclusion and clinical relevance

Melatonin may have potential beneficial effects on bone defect repair.

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Correspondence to María Piedad Ramírez-Fernández.

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Ramírez-Fernández, M.P., Calvo-Guirado, J.L., de-Val, J.EM.S. et al. RETRACTED ARTICLE:Melatonin promotes angiogenesis during repair of bone defects: a radiological and histomorphometric study in rabbit tibiae. Clin Oral Invest 17, 147–158 (2013). https://doi.org/10.1007/s00784-012-0684-6

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  • DOI: https://doi.org/10.1007/s00784-012-0684-6

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