Browsing by Author "Gungor, Serap"

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Corrosion of Metallic Biomaterials
(Springer-verlag Berlin, 2015) Dikici, Burak; Esen, Ziya; Duygulu, Ozgur; Gungor, Serap
Metallic materials have been used as biomedical implants for various parts of the human body for many decades. The physiological environment (body fluid) is considered to be extremely corrosive to metallic surfaces; and corrosion is one of the major problems to the widespread use of the metals in the human body since the corrosion products can cause infections, local pain, swelling, and loosening of the implants. Recently, the most common corrosion-resistant metallic biomaterials are made of stainless steels and titanium and its alloys along with cobalt chromium molybdenum alloys. It is well known that protective surface films of the alloys play a key role in corrosion of the metallic implants. Key documents on the corrosion behavior of the metallic biomaterials in human body have been compiled under this chapter as a review.
Evaluation of the Chitosan-Coating Effectiveness on a Dental Titanium Alloy in Terms of Microbial and Fibroblastic Attachment and the Effect of Aging
(inst Za Kovinske Materiale I in Tehnologie, 2015) Kalyoncuoglu, Ulku Tugba; Yilmaz, Bengi; Gungor, Serap; Evis, Zafer; Uyar, Pembegul; Akca, Gulcin; Kansu, Gulay
The aim of this study was to obtain a biocompatible and antimicrobial implant surface by coating Ti6Al4V with chitosan which can be used to create a smooth transmucosal region for a faster and better wound healing and an increased bioactivity. Ti6Al4V plates were first abraded and ultrasonically cleaned and then coated with chitosan. In order to simulate the conditions of an oral environment, a group of coated plates were treated in a thermocycle apparatus. The coatings were evaluated with SEM, EDS, XRD and FTIR spectroscopy. The fibroblastic cell behavior was determined using HGF-1 cells. P. gingivalis was used to assess the effectiveness of chitosan as an antimicrobial coating. It can be said that the Ti6Al4V plates were successfully coated with chitosan, indicated by the presence of the C, H and O elements in the EDS results. There were no significant differences between the XRD patterns of the coated and uncoated plates; however, the characteristic bands of chitosan were observed in the FTIR patterns of both the coated and aged samples. The fibroblast-cell attachment and proliferation were enhanced while the bacterial proliferation was inhibited by the chitosan coating. Chitosan was shown to be a biologically useful material that can be used as the coating material for transmucosal regions of dental implants.
The Micro-Structural Investigation of Nano-Calcium Phosphates Doped With Fluoride Ions
(Gazi Univ, Fac Engineering Architecture, 2015) Tahmasebifar, Aydin; Gungor, Serap; Evis, Zafer
In this study, fluoride (F-) doped calcium-phosphates (CaP) at various compositions were synthesized by a precipitation method and sintered at 1100 degrees C for 1 and 5 h to investigate their microstructures. It was observed that densities of the sintered materials were increased by extending the sintering time. The structural analysis determined by Rietveld refinement proved the presence of beta-tri-calcium phosphate (TCP) as the main phase. Also, a considerable amount of hydroxyapatite (HA) was detected in the samples. Unit cell volumes shrinked upon ions substitution. Scanning electron microscopy (SEM) results showed that addition of doping ions resulted in smaller grains. In Fourier transform infrared spectroscopy (FTIR), in addition to the characteristic bands of TCP, F-ion substitution was confirmed.