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Öğe Effects of Hypericum perforatum on the healing of xenografts: a histomorphometric study in rabbits(Churchill Livingstone, 2017) Damlar, I.; Arpag, O. F.; Tatli, U.; Altan, A.The aim of this study was to investigate effects of the Hypericum perforatum (St John's Wort) on bone healing in rabbit calvarium. Ten male New Zealand rabbits each had three bicortical defects made in the calvarial bones, which were filled with xenograft, xenograft + H perforatum oil extract, and autogenous graft. Four weeks postoperatively all rabbits were killed and the bony defects examined histomorphometrically. Tissue compartments including new bone (p < 0.001), marrow space (p < 0.001), and residual bone grafts (p = 0.014) differed significantly among groups. The volume of residual graft was significantly decreased in the xenograft/H perforatum group compared with those with xenografts alone (p = 0.0147). The differences in microarchitectural variables of de novo bone formation were also significant (trabecular thickness (p < 0.001), trabecular width (p < 0.001), trabecular separation (p = 0.001). There were no significant differences in node: terminus ratio between the xenograft/H perforatum group and the other two groups. However, the difference in node: terminus ratio between the autogenous graft and xenograft group was significant (p = 0.001) Oil extracts of H perforatum improved bony healing in defects filled with bovine-derived xenografts. (C) 2016 The British Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.Öğe Nanomechanical Properties of Different Dental Restorative Materials(Polish Acad Sciences Inst Physics, 2016) Altan, H.; Bilgic, F.; Arslanoglu, Z.; Kale, E.; Kale, A. Koroglu; Altan, A.; Sahin, O.The aim of this study is to determine the hardness and roughness of glass ionomer cement, glass carbomer, and compomer by nanoindentation. Three different dental restorative materials: glass ionomer cement, glass carbomer cement, and compomer were used. Disc specimens (1 0 mm x 1 mm) were prepared from each material using teflon mold. All specimens were light cured according to the manufacturer's instructions. The specimens were then mounted in polyacrilic resin. After grinding and polishing the specimens were stored in distilled water at 37 degrees C for 1 day. The specimens were investigated using nanoindenter. The highest nanohardness was measured for glass ionomer cement and the lowest for glass carbomer. Regarding roughness, glass ionomer cement and compomer showed the highest mean values. Glass ionomer cement and compomer exhibited similar nanomechanical properties. Glass carbomer had superior ability to be polished up.Öğe Rotational autotransplantation of mandibular alveolar ridge(Churchill Livingstone, 2017) Damlar, I.; Altan, A.; Arpag, O. F.[Abstract Not Available]
