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    Effect of Sodium Hypochlorite and EDTA on Surface Roughness of HyFlex CM and HyFlex EDM Files
    (Wiley, 2018) Uslu, Gulsah; Ozyurek, Taha; Yilmaz, Koray
    The aim of the present study was to compare the effect of exposure to sodium hypochlorite (NaOCl) and ethylenediaminetetraacetic acid (EDTA) on the surface topography and roughness of HyFlex controlled memory (CM) and HyFlex electrical discharge machining (EDM) using atomic force microscopy (AFM). Twenty HyFlex EDM (25/.08) and 20 HyFlex CM (25/.06) files were divided into five groups (n = 4). One group served as a negative control group. The files in the other groups were exposed to 5.25% NaOCl and 17% EDTA solutions at 37 degrees C for 5 and 10 min, respectively, and examined using AFM after each exposure. The data were analyzed using one-way ANOVA test. The lowest values were observed in the control group of HyFlex EDM files (p < .05). The highest values were observed in the HyFlex EDM and HyFlex CM files immersed in EDTA for 10 min (p < .05). In conclusion, the tested irrigants had a significant negative effect on the surface porosity of NiTi files. The immersion of NiTi files in irrigants during cleaning and sterilization procedures results in corrosion and surface deformation of the files, and this can lead to unexpected file fracture during clinical use. Thus, the investigation of effect of ethylenediaminetetraacetic acid (EDTA) and sodium hypochlorite (NaOCl) on surface topography of HyFlex files is important.
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    Fracture strength of endodontically treated teeth restored with different fiber post and core systems
    (Springer, 2020) Ozyurek, Taha; Topkara, Can; Kocak, Imran; Yilmaz, Koray; Gundogar, Mustafa; Uslu, Gulsah
    The aim of this study was to investigate the effects of different post and core systems, CAD/CAM crown placement on fracture strength of endodontically treated mandibular premolar teeth. One hundred forty single-rooted premolar teeth were randomly divided into a control group and six experimental groups as follows: control group (Group 1); FiberSite post luting with Clearfil DC Core Plus (Group 2); RelyX Fiber post luting and core build up with Clearfil DC Core Plus (Group 3); RelyX Fiber post luting with Clearfil DC Core Plus and core build up with Filtek Bulk Fill Posterior (Group 4); specimens that received CAD/CAM crowns after the same procedures performed in Groups 2, 3, and 4, respectively (Groups 5, 6, and 7). Fracture strength tests were performed, and the failure modes were recorded. Data were statistically analyzed using one-way ANOVA and post hoc Tukey tests. The highest fracture resistance was observed in the control group and among the experimental groups in Group 4. Groups 3 and 5 showed similar fracture resistance followed by Group 2. The lowest fracture resistances were seen in the samples of Groups 6 and 7. While the fracture strength of Group 2 increased after the crown placement (Group 5), the fracture strength of Group 3 and Group 4 decreased (P < 0.05). While the specimens in Groups 1, 2, 3, and 4 predominantly showed favorable failure, unfavorable failure was more frequent in Groups 5, 6, and 7.
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    Öğe
    Number of file usage on dentinal defect incidence of waveone gold and reciproc NiTi instruments
    (Cumhuriyet University Faculty of Dentistry, 2018) Özyürek, Taha; Yilmaz, Koray; Uslu, Gülşah
    Amaç: Kök kanal preperasyonu sirasinda Reciproc ve WaveOne GOLD NiTi kanal aletlerinin neden oldugu dentinal defekt vakalarini karsilastirmak ve ege kullanim sayisinin dentinal defekt insidansi üzerindeki etkisini incelemek. Materyal ve Metot: Iki yüz yetmis adet mandibular kesici dis çalismaya dahi edildi ve rastgele 3 gruba ayrildi. Negatif kontrol grubu (n = 30) herhangi bir islem yapilmadi, 120'şer diş de reciproc ve waveone gold gruplarina yerlestirildi. örneklerden apeksten 3, 6 ve 9 mm uzakta olucak sekilde yatay kesitler alindi ve light emitting diode lazer yardimi ile çekilen fotograflarda dentinal defekt varligi arastirildi. Bulgular: WaveOne GOLD, Reciproc ve control gruplari arasinda dentinal defect olusumu açisindan istatistiksel olarak anlamli bir fark yoktur. Resiproc egesinin 4. Kullanimi sonrasi apical bölgede olusturdugu dentinal defect sayisi WaveOne GOLD grubunun 1., 2. ve 3. Kullanimlari sonrasi olusan sayudan istatistiksel olarak anlamli derecede fazladir (p <, 05). Sonuç: çalismamizda test ettigimiz tüm NiTi egeler kök kanal dentininde defect olusumuna neden oldu ancak WaveOne GOLD, Reciproc ve kontrol grouplari arasinda toplam dentin defekti olusumu açisindan istatistiksel olarak anlamli bir fark bulunmadi. © Cumhuriyet University Faculty of Dentistry 2018.; Objectives: To compare the incidences of dentinal defects caused by Reciproc and WaveOne GOLD NiTi files during root canal preparation and to exam the effect of number of file usage on the incidence of dentinal defect. Materials and Methods: Two hundred seventy mandibular incisor teeth were randomly divided into 3 different groups as follows: negative control (no preparation performed) (n: 30), Reciproc (n: 120) and WaveOne GOLD (n: 120) groups. The specimens were sliced at 3, 6 and 9 mm from the apex. Microscopic pictures of the specimens were taken with the aid of light emitting diode and the dentinal defects were examined. Results: There was no statistically difference among the WaveOne GOLD, Reciproc and control groups in terms of dentinal defect formation. The number of dentinal defects occurred in apical region in Reciproc group following 4th use was found to be statistically higher than 1st, 2nd, and 3rd use in WaveOne GOLD group (p < .05). Conclusion: All the NiTi files tested in present study were found to cause defect in root canal dentin but there were not significant difference among the WaveOne GOLD, Reciproc and control groups in term of total dentinal defect formation. © Cumhuriyet University Faculty of Dentistry 2018.
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    Pull-out Retentive Resistance of Fiber Posts Restored with Different Core Materials
    (Galenos Publ House, 2022) Topkara, Can; Yilmaz, Koray; Gundogar, Mustafa; Uslu, Gulsah; Ozyurek, Taha
    Objective: This study aimed to assess the pull-out bonding resistance of FiberSite and RelyX Fiber posts constructed from core structures using various resin cement. Materials and Methods: Sixty mandibular premolar teeth were horizontally sectioned to create a root canal length of 15 +/- 1 mm. Up to size #40, samples were prepared and obturated with gutta-percha and root canal sealer. Three groups of specimens (n=20) were formed. FiberSite posts were luted and built-up using Clearfil DC Core Plus in Group 1, RelyX Fiber posts were luted and built-up using Clearfil DC Core Plus in Group 2, and RelyX Fiber Posts were luted and built-up using Filtek Bulk Fill Posterior in Group 3. Each specimen was vertically positioned in a universal testing machine and rotated at 0.5 mm/min until it dislodged. Oneway ANOVA and post hoc tests were used to evaluate the data. Results: The bonding strength of FiberSite posts was higher than that of RelyX Fiber posts (p<0.05). Clearfil DC Core Plus-built RelyX Fiber Posts exhibited higher bond strength than Filtek Bulk Fill Posterior-built posts (p<0.05). Conclusion: FiberSite posts provide better root canal dentin retention than RelyX Fiber posts with different core materials.