Yazar "Uslu, Gülşah" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim
    Öğe
    Comparison of cyclic fatigue resistance of One Curve, hyflex EDM, Waveone Gold and Reciproc Blue nickel-titanium rotary files at intra-canal temperature
    (Cumhuriyet Üniversitesi, 2019) Yılmaz, Koray; Özyürek, Taha; Uslu, Gülşah
    Objectives: To compare the cyclic fatigue resistances of One Curve (OC), Hyflex EDM (HEDM), WaveOne Gold (WOG), Reciproc Blue (RPC Blue), and nickeltitanium rotary files at intra-canal temperature (35°C). Materials and Methods: Twenty OC (25/.06), 20 HEDM (25/.08), 20 WOG (25/.07) and 20 RPC Blue (25/.08) files were tested for cyclic fatigue at intracanal temperature (35°C). All the instruments were rotated in artificial which were made of stainless steel with an 60° angle of curvature and a radii of curvatures of 5 mm until fracture occurred, and the time to fracture was recorded in seconds using a digital chronometer and the number of cycles to fracture (NCF) for each file was calculated. The Kruskal-Wallis test was performed to statistically analyze the data by using SPSS 21.0 software. The statistical significance level was set at p<.05. Results: NCF values revealed that the HEDM had the highest cyclic fatigue resistance at intracanal temperature (p<.05) and followed by WOG, RPC Blue and OC. The lowest NCF values were determined in the OC group and statistically significant difference was observed between the OC group the other groups (p<.05). No statistically significant difference in the mean length of the fractured fragments in curvature was evident for the instruments (p>.05). Conclusion: Within the limitations of the present in-vitro study, HEDM instrument resisted static cyclic fatigue significantly more than RPC Blue, WOG and OC instruments.
  • Küçük Resim
    Öğe
    Effect of endodontic treatment and retreatment procedures on fracture strength of roots
    (Türkiye Klinikleri Yayınevi, 2019) Yılmaz, Koray; Özyürek, Taha; Uslu, Gülşah
    Objective: It is aimed to compare the effect of root canal treatment and retreatment procedures on the fracture strength of roots. Material and Methods: One hundred and twenty extracted single-canal mandibular premolar teeth were involved in the present study. The bucco-lingual and mesio-distal diameters of the roots were measured. The crowns of teeth were removed from the point of cemento-enamel junction in the way ensuring the standard root length of 14 mm. The teeth were then randomly divided into 6 groups (n=20). In Group 1, no instrumentation or obturation was performed. The rest of the roots were chemo-mechanically prepared with nickel-titanium rotary instruments (ProTaper Next, Dentsply Maillefer, Ballaigues, Switzerland) up to size 40/.06. The teeth in Group 2 were left without obturation. Group 3 was obturated by using the warm vertical compaction technique. Those in Group 4 were obturated and retreated (20/.07). The teeth in Group 5 were obturated, retreated and apically enlarged (50/.05). Finally, the teeth in Group 6 were obturated, retreated, apically enlarged (50/.05) and re-obturated and then the fracture resistances of the all specimens were tested by using a universal testing machine. Results: There was no statistically significant difference between the fracture resistance of teeth in Group 1, Group 3, and the Group 6. No statistically significant difference was found between the teeth in Group 2, Group 4 and Group 5. The lowest resistance to fracture was found in Group 5. There were statistically significant differences between Group 1, Group 3, Group 6 and Group 2, Group 4, Group 5. Conclusion: Obturation after preparation and retreatment procedures increased the resistance of teeth to fracture.
  • [ N/A ]
    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.