Browsing by Author "Durkan, Rukiye"

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A Bibliometric Analysis of the Most Cited Articles Published in the Cumhuriyet Dental Journal#;
(Cumhuriyet University Faculty of Dentistry, 2022) Gökay,G.D.; Oyar,P.; Durkan,R.
Objectives: The aim of this study was to evaluate the bibliometric profile of the most cited articles published in Cumhuriyet Dental Journal (CDJ). Materials and Methods: TR Dizin database was used to search the most frequently cited articles. After the screening process, a researcher organized the articles according to the citation counts. The citation counts, publication year, authorship, contributing institutions and countries, manuscript language, field of dental research, study type and design, data analysis method and keywords were evaluated. Results: 123 citations were made to 76 articles. The citation counts ranged from 1 to 6. While the highest citation counts (n=17) were in 2012, the highest citation prevalence (1.93) was in 2011. There was a predominance of research area of Dental Materials (23.7%), original articles (69.7%), experimental studies (38.2%) and analytical data analysis method (90.2%). Original research articles in Dental Materials (88.9%) and Behavioral, Epidemiological and Health Services Research (100%), review articles in Prosthodontics (37.5%), and case reports in Diagnostic Research (57.1%) was more common. The highest citation prevalence was found in Periodontology (2.75). Most of the articles (28.9%) have 3 authors. Most of the articles (90.8%) originated from Turkey with the greatest contributions from Cumhuriyet University Faculty of Dentistry (22.4%). The manuscript language was Turkish at a rate of 57.9%. Among a total of 282 keywords, the most frequently used keywords were ‘‘bond strength“ (n=6) and ‘‘composite resin” (n=5). Conclusions: The profile of citations in CDJ shows that original research in the research areas of Dental Materials and Behavioral, Epidemiological and Health Services Research is predominant, with growing participation of local authors. © 2022. All Rights Reserved.
Evaluation of biomechanical effects of prosthetic components with different materials on the abutment screw
(Cumhuriyet University Faculty of Dentistry, 2021) Gökay,G.D.; Gökçimen,G.; Durkan,R.
Objectives: The aim of this study was to assess the effects of different resin-based and ceramic superstructure materials and two different abutment types on the stress distribution of the abutment screw using the method of three-dimensional finite element stress analysis. Materials and Methods: A three-dimensional implant, abutment (zirconia and titanium), abutment screw, crown (zirconia reinforced lithium silicate, lithium disilicate, polymer-infiltrated resin ceramic, and PEEK), and alveolar bone were designed using Rhinoceros 3D modeling software and VRMesh Studio software to form 8 simulations. On the models prepared, loading was made on the lingual tubercle of the maxillary right first premolar crown at an angle of 30° with 150 N force obliquely in the buccolingual direction. The von Mises stress values obtained from the abutment screw were compared according to the types of abutment and crown materials. Results: The von Mises stress values in the abutment screw were higher in the models using a titanium abutment (on average 1336.24 MPa), and the lower stress values were obtained in the models using a zirconia abutment (on average 964.26 MPa). When the prosthetic material used was changed, the stress values on the abutment screw was similar. Conclusions: Considering that the abutment screw is the weakest component of the implant-system, zirconia abutments can be used reliably in the maxillary first premolar region where aesthetic expectations are high. © 2021,Cumhuriyet Dental Journal. all rights reserved
Evaluation of the Effect of Brushing on Vickers Microhardness of Acrylic Denture Base Resins Polymerized by Different Techniques;
(Cumhuriyet University Faculty of Dentistry, 2023) Gökçimen,G.; Gökay,G.D.; Oyar,P.; Durkan,R.; Rona,N.
Objectives: To prevent the negative effects of brushing on the microhardness of the acrylic resin, different polymerization techniques may be taken into consideration while choosing the denture base material. This study's objective was to assess how brushing affected the Vickers microhardness of acrylic denture base resins polymerized using various methods. Materials and Methods: From each acrylic resin (Integra and FuturaJet), 100 disk-shaped specimens (15 mm in diameter and 2 mm thick) were created. A total of five distinct polymerization processes—the traditional water-bath method, short and long autoclave polymerization, injection-molding polymerization, and auto-polymerization—were examined (n=20). An automatic brushing machine was used to imitate brushing on half of the specimens, applying 54 000 brush strokes each specimen. All specimens were then subjected to a Vickers hardness test with a 300-g force for 15 s. Data analysis was done using the Mann-Whitney U test, Kruskal-Wallis test, and Dunn's post-hoc test; statistical significance was set at p<0.05. Results: In all polymerization methods, a statistically significant difference was seen between the control and brushing groups. The autopolymerized acrylic resin group substantially had lower microhardness values than the control and brushing groups' short, long autoclave, and water bath-polymerized resins. Conclusions: The microhardness of acrylic denture base resins should be taken into consideration when considering polymerization procedures because the autopolymerization method may have certain drawbacks in terms of preventing negative effects of brushing on the microhardness. © This work is licensed under Creative Commons Attribution 4.0 International License
Geleneksel PMMA, Modifiye MMA ve Poliamid Protez Kaide Materyallerinin Farklı İçeceklere Karşı Renk Stabilitesi
(Galenos Publ House, 2023) Ağan, Hatice; Gökay, Gonca Deste; Oyar, Perihan; Durkan, Rukiye; Gürbüz, Ayhan
Amaç: Bu çalışmanın amacı, yaygın olarak tüketilen içeceklerin farklı zaman aralıklarında protez kaide materyallerinin renk stabilitesi üzerindeki etkisini değerlendirmektir. Gereç ve Yöntemler: Konvansiyonel polimetilmetakrilat (PMMA) (Meliodent), modifiye metilmetakrilat (MMA) (Bre-Crystal ve Acryfee) ve poliamid (Bre-Flex, Flexinylon ve T Crystal) akrilik rezinlerden oluşan 20 disk şeklinde (10 mm çap, 2 mm kalınlık) örnek pürüzsüz ve pürüzlü yüzeylerde hazırlandı. Tüm örneklerin başlangıç rengi kolorimetre ile ölçüldü (T0). Her örnek kahve, kola, çay ve distile suya daldırıldı. Örneklerin rengi 1 günlük (T1), 12 günlük (T2) ve 36 günlük (T3) daldırma sürelerinden sonra tekrar ölçüldü. Her örnek için ortalama renk değişikliklerini (∆E) hesaplamak için CIE L*a*b* sistemi kullanıldı. Elde edilen veriler 0,95 güven aralığında ANOVA ve Bonferroni testleri kullanılarak istatistiksel olarak karşılaştırıldı.Bulgular: Pürüzsüz ve pürüzlü yüzeyler arasında renk değişimi açısından zaman veya içecekten bağımsız olarak anlamlı fark yoktu (p>0,05). Tüm zaman aralıklarında, modifiye MMA (Bre-cystal) daha yüksek renk stabilitesi gösterdi (p<0,05). Zamandan bağımsız olarak, kolaya daldırılan modifiye MMA (Acryfree) ve konvansiyonel PMMA (Meliodent) örnekleri, istatistiksel olarak anlamlı derecede daha düşük renk stabilitesi sergiledi (p<0,05). Sonuç: Çalışmada kullanılan içecekler, T1 ve T3 periyodlarından sonra distile suya göre istatistiksel olarak anlamlı bir renk değişimine neden olmadı. NBS sistemine göre T3 periyodundan sonra renk değişimleri “hafif” ile “çok” arasındaydı. Modifiye MMA rezin (Brecrystal), uzun süreli kullanımda yüksek renk stabilitesi nedeniyle PMMA alerjisi olan hastalarda protez kaide materyali olarak öne çıkabilir.