Browsing by Author "Demir, Necdet"

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    Decellularization of Trachea With Combined Techniques for Tissue-Engineered Trachea Transplantation
    (KOREAN SOC OTORHINOLARYNGOL, 2019-01-01) Batioglu-Karaaltin, Aysegul; Ovali, Ercument; Karaaltin V, Mehmet; Yener, Murat; Yilmaz, Mehmet; Epupoglu, Fatma; Yilmaz, Yetkin Zeki; Bozkurt, Erol Rustu; Demir, Necdet; Konuk, Esma; Bozdag, Ergun Sureyya; Yigit, Ozgur; Cansiz, Harun
    Objectives. The purpose of this study is to shorten the decellularization time of trachea by using combination of physical, chemical, and enzymatic techniques. Methods. Approximately 3.5-cm-long tracheal segments from 42 New Zealand rabbits (3.5 +/- 0.5 kg) were separated into seven groups according to decellularization protocols. After decellularization, cellular regions, matrix and strength and endurance of the scaffold were followed up. Results. DNA content in all groups was measured under 50 ng/mg and there was no significant difference for the glycosaminoglycan content between group 3 (lyophilization+deoxycholic acid+de-oxyribonuclease method) and control group (P=0.46). None of the decellularized groups was different than the normal trachea in tensile stress values (P>0.05). Glucose consumption and lactic acid levels measured from supernatants of all decellularized groups were close to group with cells only (76 mg/dl, and 53 mg/L). Conclusion. Using combination methods may reduce exposure to chemicals, prevent the excessive influence of the matrix, and shorten the decellularization time.
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    The Healing Effects of Autologous Mucosal Grafts in Experimentally Injured Rabbit Maxillary Sinuses
    (KOREAN SOC OTORHINOLARYNGOL, 2016-01-01) Topdag, Murat; Kara, Ahmet; Konuk, Esma; Demir, Necdet; Ozturk, Murat; Caliskan, Sebla; Topdag, Deniz Ozlem; Ulubil, Arif; Keskin, Ibrahim Gurkan; Iseri, Mete
    Objectives. Healing processes of the nose and paranasal sinuses are quite complex, and poorly understood. In this study, we aimed to compare the effect of mucosal autologous grafts on the degenerated rabbit maxillary sinus mucosa with spontaneous wound healing. It is hypothesized that mucosal grafts will enhance ciliogenesis and improve the morphology of regenerated cilia. Methods. Ten female New Zealand rabbits were included in the study. They underwent external maxillary sinus surgery through a transcutaneous approach. A total of 20 maxillary sinuses were randomly divided into 2 groups: `spontaneous healing group' and `autologous graft group.' The animals were sacrificed at the 14th day after the surgery. Scanning electron microscope (SEM), and light microscope were used for the evaluation. Results. Cellular composition of the graft group is better than the spontaneous healing group. The graft group had larger areas covered with ciliary epithelium than the spontaneous healing group, and the mean length of the cilias were also longer. Additionally, there were wider cilia with abnormal morphology areas in the spontaneous healing group. Conclusion. In our opinion, covering of the denuded areas with a graft improves re-epithelization, and may prevent the early complications after sinus surgeries.