İstanbul Kent Üniversitesi Research and Academic Performance System
DSpace@Kent is an integrated information system that unifies the monitoring, analysis and reporting of scientific research and academic performance at İstanbul Kent University.

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Item type:Item, Üretici tarafından önerilen protokollere göre polimerize edilen bulk-fill kompozitlerin dentin makaslama bağlanma dayanımı ve eğilme dayanımının değerlendirilmesi: In vitro çalışma(Türkiye Klinikleri, 2026) ;Şahin, Merve ;Kıtın, Emine ;Erden Kayalıdere, Ezgi ;Silahtar, EsraGüray Efes, Ümit BegümAmaç: Bu çalışmanın amacı, üretici talimatlarına uygun polimerizasyon koşulları altında bir geleneksel ve beş bulk-fill rezin kompozitin dentin makaslama bağlanma dayanımını [shear bond strength (SBS)], üç nokta eğilme dayanımını [flexural strength (FS)] ve kırılma tipi dağılımlarını; standart bir polimerizasyon rejimi yerine, her bir materyal için üretici tarafından önerilen spesifik protokoller altında değerlendirmek ve karşılaştırmaktır. Gereç ve Yöntemler: Çalışmada yer alan tüm materyaller, üretici talimatlarına uygun olarak farklı ışık şiddeti (1.200-3.000 mW/cm²) ve süre (3-30 sn) kombinasyonları kullanılarak polimerize edilmiştir. SBS (n=10/grup) insan molar dişleri üzerinde ölçülmüş ve kırılma tipleri adeziv/koheziv/miks olarak sınıflandırılmıştır. FS, 2×2×25 mm boyutlarında çubuk örnekler üzerinde ISO 4049’a göre test edilmiştir. SBS ve FS verileri Kruskal-Wallis testi, ardından Bonferroni düzeltmeli ikili karşılaştırmalar ile analiz edilmiştir (α=0,05). Kırılma tipi dağılımları ki-kare testi ile karşılaştırılmıştır. Bulgular: SBS açısından genel olarak anlamlı fark saptanmıştır. Tetric PowerFlow ve SonicFill 3; Tetric PowerFill, Opus Bulk Fill Flow ve IPS Empress Direct’e kıyasla anlamlı derecede daha düşük SBS göstermiş; ancak Opus Bulk Fill’den ve birbirlerinden farklı bulunmamıştır. Kırılma tipi dağılımları gruplar arasında anlamlı farklılık göstermemiştir; SonicFill 3’te adeziv kırılmaların beklenenden fazla olduğu gözlenmiştir. FS açısından genel fark anlamlıdır; IPS Empress Direct ve Opus Bulk Fill Flow; Opus Bulk Fill, Tetric PowerFlow, SonicFill 3 ve Tetric PowerFill’e kıyasla anlamlı derecede daha düşük FS değerleri sergilemiştir. Sonuç: Üretici talimatlarına uygun polimerizasyon altında SBS ve FS değerleri materyale bağlıdır; kırılma tipi paternleri SBS sonuçlarının yorumlanmasına katkı sağlamakla birlikte materyaller arasında farklılık göstermemiştir.Item type:Item, Color matching and stability of single-shade paste, single-shade flowable bulk-fill, and simplified shade-system bulk-fill composites(Medicina Oral S.L., 2026) ;Şahin, Merve ;Kaya, Melike Gizem ;İnci, Can ;Deveci, Burak AhmetErden Kayalıdere, EzgiBackground: The growing demand for efficient aesthetic restorations has driven the development of single-shade and simplified shade-system resin composites, which are designed to streamline clinical workflows without compromising optical integration. However, their initial color-matching capabilities and long-term stability following dietary staining remain critical clinical concerns. Therefore, this study aimed to evaluate the color matching and stability of a single-shade paste composite, a single-shade flowable bulk-fill composite, and a simplified shade-system paste bulk-fill composite. Materials and Methods: Thirty extracted human molars were allocated to three groups (n=10): Charisma Topaz One, Charisma Bulk Flow One, and Opus Bulk Fill APS. Standardized buccal cavities (4x4 mm) were prepared and restored following selective etching and universal adhesive application. Instrumental color (VITA Easyshade V) was recorded at baseline, 24 h post-restoration, after 7-day coffee staining, and after repolishing; visual matching (five calibrated observers, 5-point scale) was recorded at the last three of these time points. Data were analyzed using CIEDE2000 (ΔE00), ANOVA, Kruskal-Wallis, Friedman tests, and GEE models (α=0.05). Results: A significant intergroup difference occurred only at the post-restoration/baseline interval (p<0.001), where the simplified shade-system showed lower ΔE00 than both single-shade materials. No significant differences were found after staining or repolishing (p>0.05). All materials showed significant phase-related (ΔE00) changes (p<0.001). Repolishing significantly reduced the color change produced by staining in all groups. Visual acceptability remained high but showed significant time and group×time interactions. Conclusions: All composites exhibited similar staining susceptibility, with repolishing reversing much of the staining-related color change. Initial color matching differed among the materials but was influenced by baseline tooth color.Item type:Item, Between pragmatism and populism: JDP, securitization, and the limits of the contagion effect in Türkiye-EU migration politics(Routledge, 2026)Akşit Ergen, GizemOver the last two decades, populism and migration have become two of the most closely intertwined issues in comparative politics. Mainstream literature, especially within European contexts, conceptualizes their relationship through exclusion, securitization, and nationalism. Right‑wing populist parties such as the Alternative für Deutschland (AfD), the Rassemblement National (France), and the Lega (Italy) exemplify how anti‑immigrant rhetoric serves as a core mobilizing axis of populist politics (Mudde, 2019; Wodak, 2021). This trend has led to what is often described as the “contagion effect,” the spread of exclusionary migration narratives across party systems, normalizing anti‑immigrant sentiment within mainstream politics (Bale et al., 2010; Mondon & Winter, 2020; Mudde, 2007). Yet much of this analysis remains Eurocentric, overlooking cases that differ from securitized and exclusionary populism (Ataç et al., 2017; Caviedes, 2015).Item type:Item, From framing to strategy: Securitisation of migration in German and French far-right politics(International Studies Association, 2026)Akşit Ergen, GizemThis study examines the evolution of migration framing within the political communication of two prominent Populist Radical Right Parties (PRRPs): Germany’s Alternative für Deutschland (AfD) and France’s Rassemblement National (RN) during the post-pandemic period (2021–2025). The research focuses on how these parties strategically categorize migration as a multidimensional threat to national identity, sovereignty, and socio-economic stability. Using systematic content analysis and word frequency methods on party manifestos and campaign materials, the study identifies significant shifts and patterns in their securitization strategies. The findings reveal that while the AfD maintains a consistent thematic focus on cultural and identity-based threats, the RN demonstrates a pragmatic transition from security-centered rhetoric to economically driven arguments between 2022 and 2024. By integrating Eurobarometer data on public concerns, the analysis explores the correlation between shifting public anxieties and the parties' thematic priorities. This comparative approach highlights the adaptive nature of PRRP communication, suggesting that the framing of migration is a strategic tool calibrated to align with evolving public opinion. The study contributes to the literature on populist party strategies and the systematic measurement of migration-related threats in contemporary European politics.Item type:Item, Effect of mechanical polishing and 35% hydrogen peroxide application on DIAGNOdent measurements in stained occlusal fissures: A randomized split-mouth clinical study(Springer Nature, 2026) ;Loça, Anıl ;Erçin, Özlem ;Kopuz, Dilan ;Kanar, ÖzlemKorkut, BoraBackground DIAGNOdent laser fluorescence measurements may be confounded by extrinsic staining in occlusal fissures, and the effect of common surface-preparation protocols on these readings remains unclear. The aim of this study was to compare the effects of mechanical polishing and 35% hydrogen peroxide application on DIAGNOdent Pen measurements in stained occlusal fissures. Methods In this randomized split-mouth clinical study, 126 posterior teeth from 24 participants were evaluated. Opposing jaws received either mechanical polishing with a fluoride-free prophylaxis paste for 30 s or 35% hydrogen peroxide gel for 15 min. DIAGNOdent scores were recorded at baseline, after air–water spray cleaning and drying, and after the assigned procedure. Digital bite-wing radiographs obtained at baseline as a complementary diagnostic assessment. Data were analyzed using linear mixed-effects models and Wilcoxon signed-rank tests. Results Air–water spray cleaning and drying did not significantly change DIAGNOdent values in either group (bleaching: p = 0.355; polishing: p = 0.516). Post-procedure scores increased significantly after bleaching (p = 0.023) and polishing (p < 0.001). The mean score change was significantly greater after polishing than bleaching (18.4 ± 26.0 vs. 4.6 ± 19.3; p < 0.001).Conclusions Surface-preparation protocols significantly influence DIAGNOdent readings in stained occlusal fissures. Post-polishing readings should be interpreted with caution due to potential paste retention and measurement artifacts, whereas 35% hydrogen peroxide application induces a more limited change without mechanical surface alteration. Standardized surface-preparation protocols and interpretation alongside clinical and radiographic findings are recommended.


















