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    Effects of Melatonin on Tibia Bone Defects in Rats
    (Soc Chilena Anatomia, 2016) Koparal, M.; Irtegun, S.; Alan, H.; Deveci, E.; Gulsun, B.; Pektanc, G.
    The aim of this study was to evaluate the effects of melatonin healing in a tibial bone defect model in rats by means of histopathological and immunohistochemistry analysis. Twenty one male Wistar albino rats were used in this study. In each animal, bone defects (6 mm length) were created in the tibias. The animals were divided into three groups. In group 1 control group (rats which tibial defects). Group 2 melatonin (10 mg/kg) + 14 days in the tibial defect group) was administered intraperitoneally to rats. Group 3 melatonin (10 mg/kg) + 28 days in the tibial defect group) was administered intraperitoneally to rats. Histopathological analysis of samples was performed to evaluate the process of osteoblastic activity, matrix formation, trabecular bone formation and myeloid tissue in bone defects. Immunohistochemical and immunoblot analysis demonstrated non-collagenous proteins (osteopontin and osteonectin) differences in tibial bone defects. The expression of osteopontin on tibia was increased by 14 days melatonin treatment. The expression of osteonectin on tibia was dramatically increased by 14 days melatonin treatment.
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    Öğe
    The histological study of osseous regeneration following implantation of various bone graft biomaterials
    (Wolters Kluwer Medknow Publications, 2016) Alan, H.; Farahani, E. M. Z.; Tunik, S.; Kavak, G.
    Background: While various biomaterials are used for bone regeneration, the relative comparative efficiency of them has not been thoroughly investigated. Purpose: This study evaluated histopathological events during osseous healing after implantation of following bone grafts: Demineralized freeze-dried cortical bone powder (DFDB), natural coral implants, calcium sulfate-based putty containing demineralized bone matrix (CaS-DBM), and pure-phase beta tricalcium phosphate ceramic granules (-TCP). Materials and Methods: Fifty-six Wistar Albino rats were used for this study. The postimplantation osseous healing was evaluated at 3(rd), 6(th) weeks after the operation. Results: DFDB did not induce bone formation in 3 weeks period, but it showed a highly osteoinductive effect at the end of 6(th) week period. The effects of coral implants on bone formation both at 3 and 6 weeks period were much higher than the DFDB. CaS-DBM showed higher bone formation than -TCP at 3(rd), 6(th) weeks. It was found that coral and CaS-DBM had a more beneficial impact on early bone healing compared to -TCP and DFDB. All these graft biomaterials are useable in human bone defects. The main difference in the ossous healing properties of these materials is observed early postimplantation with the delayed healing outcome being similar.