Browsing by Author "Can, Dilber Bilgili"

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3d-2d Microleakage Assessment of Preheated Bulk-Fill Composite Resin Applied With Different Parameters: a Micro-Ct Analysis
(Springer, 2023) Can, Dilber Bilgili; Ozarslan, Merve
This study evaluated microleakage from class II cavities filled with bulk-fill composite preheated to different temperatures, applied at different thicknesses, and with different polymerization modes. A total of 60 mesio-occlusal cavity were drilled into the extracted human third molars at 2 mm and 4 mm thickness. Preheated bulk-fill composite resin (Viscalor; VOCO, Germany) was applied to the cavities at 68 degrees C and 37 degrees C after the adhesive resin was applied, and cured using standard and high-power light-curing modes of a VALO light-curing unit. An incrementally applied microhybrid composite was used as the control. The teeth were subjected to 2000 cycles of heating to 55 degrees C and cooling to 5 degrees C with a 30-s hold time. Then, they were immersed in a 50% silver nitrate solution for 24 h and scanned with micro-computed tomography. Scanned data were processed using the CTAn software. Two (2D) and three (3D) dimensional analyses of leached silver nitrate were performed. The data's normality was assessed using the Shapiro-Wilk test before comparisons using a three-way analysis of variance. In both 2D and 3D analysis, bulk-fill composite resin preheated to 68 degrees C and applied at 2 mm thickness showed less microleakage. In the 3D analysis, restorations applied at 37 degrees C and 4 mm thickness in high-power mode showed significantly higher values (p < 0.001). Preheated bulk-fill composite resin can be applied at 68 degrees C and effectively cured at both 2 mm and 4 mm thickness.
Besinleri ve Ağız Ortamını Taklit Eden Sıvıların Restoratif Materyallerin Yüzey Pürüzlülüğüne Etkisi
(2021) Dündar, Ayşe; Can, Dilber Bilgili; Barutçugil, Çağatay
Amaç: Bu çalışmanın amacı, 5 farklı restoratif materyalin ağız ortamını taklit eden sıvılarda bekletil¬mesinin yüzey pürüzlülüğü (SR) üzerine etkilerini değerlendirmektir. Gereç ve Yöntemler: Çalışmada kullanılan materyaller Admira Fusion X-tra (AFX), Ceram X One (CRX), Gradia İndirekt (GRA), Filtek P60 (P60) ve Lava Ultimate’tir (LAV). Her materyalden 30 adet örnek hazırlandı ve örnekler 24 saat distile suda bekletildi. Tüm örneklere Sof-Lex seti kul¬lanılarak bitim ve cila işlemi uygulandı. Ardından tüm örneklerin başlangıç yüzey pürüzlülüğü bir profilometre cihazı (Surftest SJ-201, Mitutoyo) ile ölçüldü. Her materyal grubuna ait örnekler farklı solüsyonlarda bekletilmek üzere 4 alt gruba ayrıldı (n=6): Distile su, sitrik asit (0,02 N), etanol (%75) ve hidroklorik asit (HCl) (pH 1,2). Örnekler karanlık ortamda oda sıcaklığında 30 gün boyunca so¬lüsyonlarda bekletildi. Solüsyonlar haftalık olarak yenilendi. Otuz gün sonunda pürüzlülük ölçümleri tekrar yapıldı. Son ölçümden ilk ölçüm çıkarılarak ΔRa değerleri elde edildi. Veriler tek yönlü ANOVA ve ardından Tukey HSD testi ile analiz edildi (p=0,05). Bulgular: Etanol-su çözeltisinde bekletilen materyaller arasında, GRA grubundaki ΔRa değerinin, CRX ve P60 grubuna kıyasla istatistiksel olarak anlamlı bir farklılık gösterdiği (p<0,05) bulundu. Sit¬rik asitte bekletilen örneklerin ΔRa değerleri incelendiğinde ise sadece AFX grubunda diğer grup¬lara göre istatistiksel olarak anlamlı artış gözlendi (p<0,05). Distile su ve hidroklorik asitte bekletilen bütün materyal grupları arasında ΔRa değerlerinde istatistiksel olarak anlamlı bir farklılık bulunmadı. Sonuç: Değerlendirilen kompozit rezinlerin yüzey pürüzlülüğü, ağız ortamını taklit eden sıvılarda bekletilmelerinden farklı şekilde etkilendi.
Beyazlatıcı Ağız Gargaralarının Farklı Yüzey İşlemi Uygulanmış Hibrit Seramik Materyalin Yüzey Pürüzlülüğüne Etkisi
(2023) Özarslan, Merve; Can, Dilber Bilgili
Amaç: Bu çalışmanın amacı, üç farklı yüzey işlemi uygulanmış hibrit seramik materyalin yüzey pürüzlülüğüne farklı içerikteki üç beyazlatıcı gargaranın etkisini değerlendirmektir. Gereç ve Yöntem: Hibrit seramik bloklardan (Vita Enamic-VE) 7x5x1 mm boyutlarında örnekler hazırlandı. Numunelerin yüzeyleri silisyum karbür kağıtlar ile standardize edildi. Örnekler rastgele 3 gruba ayrıldı (n=24). Grup C: ekstra işlem yapılmadı, Grup L: VE teknik kit ve Grup G: glaze uygulandı. Örneklerin başlangıç yüzey pürüzlülük değerleri (Ra) profilometre ile ölçülüp kaydedildi. Tüm gruplar farklı içerikteki gargaralarda (hidrojen peroksit, hidrojen peroksit içermeyen ve aktif karbon içeren) bekletilmek üzere 3 alt gruba ayrıldı (n=8). 24 saat solüsyonda bekletilmesini takiben örneklerin Ra değerleri tekrar ölçüldü. Örneklerin başlangıç yüzey pürüzlülük değerleri Kruskal Wallis Testi ile incelendi. 24 saat bekletme sonrası son ölçüm değerlerinin karşılaştırılmasında İki Yönlü Varyans Analizi kullanıldı ve çoklu karşılaştırmalar Tukey HSD Testi ile yapıldı (p<0.05). Bulgular: Başlangıç pürüzlülük değerlerinde diğer gruplara göre grup G istatistiksel olarak düşük değer göstermiştir (p<0.05). Pürüzlülük fark değerleri için grup G de hidrojen peroksit içerikli gargara grubunda diğerlerine göre anlamlı fark görülmüştür (p<0.05). Sonuç: Hibrit seramik materyalin pürüzlülük değerleri yüzey bitirme işleminden etkilendi ve en düşük yüzey pürüzlülük değerleri glaze uygulanan grupta görüldü. Glaze uygulanan yüzeyler için alkol bazlı beyazlatıcı gargara tercih edilebilir.
Biofilm Formation of C. Albicans on Occlusal Device Materials and Antibiofilm Effects of Chitosan and Eugenol
(Mosby-elsevier, 2024) Ozarslan, Merve; Avcioglu, Nermin Hande; Can, Dilber Bilgili; Caliskan, Ahmet
Statement of problem. Microbial adhesion on occlusal devices may lead to oral diseases such as candidiasis. Whether chitosan and eugenol provide antibiofilm effects is unclear. Purpose. The purpose of this in vitro study was to evaluate the biofilm formation of C. albicans strains on occlusal device materials and the antibiofilm effects of chitosan and eugenol against C. albicans on these surfaces. Material and methods. A total of 88 specimens (5x10x2 mm) were produced from occlusal device materials with 4 production techniques: vacuum-formed thermoplastic (Group V), head-press (Group H), computer-aided design and computer-aided manufacture (CAD-CAM) (Group C), and 3-dimensionally (3D) printed (Group D) (n=22). After various finishing procedures, the surface properties of the specimens were evaluated by using surface free energy (SFE), surface roughness (SR) measurements, and elemental and topographic analysis. Biofilm formation of C. albicans strain and the antibiofilm effects of chitosan and eugenol against biofilm formation on these surfaces were also examined with a crystal violet assay. The distribution's normality was statistically analyzed with the Kolmogorov-Smirnov test. One-way and two-way analysis of variance with post hoc Tukey tests were used for statistical evaluations (alpha=.05). Results. Surface roughness values in Groups D and H were significantly higher than in other groups (P.05). While the highest surface free energy values (except gamma p) were in Group V, Group C had the highest gamma p. The lowest biofilm value appeared in Group H. Chitosan exhibited an antibiofilm effect in all groups except Group H, while eugenol was effective in all groups. Conclusions. The production method affected the susceptibility of occlusal device materials to the adhesion of C. albicans. Eugenol was an effective antibiofilm agent for device materials. (J Prosthet Dent 2024;131:144.e1 -e9)
Evaluation of Color Stability and Microhardness of Contemporary Bulk-Fill Composite Resins With Different Polymerization Properties
(Wiley, 2022) Can, Dilber Bilgili; Ozarslan, Merve
Objectives To determine the color stability and microhardness of three bulk-fill composites with different polymerization characteristics, after immersion in four different solutions. Materials and Methods Color measurements of three bulk fill (Viscalor (VIS), Tetric PowerFill (TPF), Fill Up! (FUP)) and a microhyrid composite resin (G-aenial posterior [GCP]) were performed after polymerization. The specimens were immersed in coffee, cola, red wine and distilled water. Discolorations were recorded after 24 h (T1), 10 days (T2) and 30 days (T3) of immersion. Delta E (CIEDE2000) values were calculated. Vickers microhardness (VHN) was measured from top and bottom surfaces at T0 and T3. Data was analyzed with Two-way ANOVA, One-way ANOVA and Tukey post hoc tests. Results The highest discoloration was seen in wine and the lowest in distilled water and cola. At T3, there was no difference in distilled water groups, while the statistically highest Delta E-00 were obtained in TPF and GCP in coffee, cola and wine. VIS groups had the highest VHN values at T0 and T3 in all solutions. Conclusions Samples immersed in coffee and wine showed discoloration beyond clinically acceptable limits. After 30 days, discoloration occurred in all materials immersed in all solutions. At T3, VIS microhardness generally decreased, while TPF did not. Clinical Significance After 30 days, all bulk-fill composites immersed in distilled water, coffee and wine showed clinically unacceptable Delta E-00.
Evaluation of Surface Characteristic and Bacterial Adhesion of Low-Shrinkage Resin Composites
(Wiley, 2021) Can, Dilber Bilgili; Dundar, Ayse; Barutcugil, Cagatay; Ozyurt, Ozlem Koyuncu
This study aimed to examine the surface characteristics of low shrinkage composites and adhesion of Streptococcus mutans and Streptococcus mitis to these materials. Control material (glass) and three low shrinkage composites (Charisma Diamond, Kalore GC, Beatiful II LS) were used. After polishing procedure was applied to composite specimens, surface roughness (SR), surface free energy (SFE), and contact angle measurements were performed. Surfaces of composite were analyzed using scanning electron microscope and energy-dispersive X-ray spectroscopy. After pellicle formation with artificial saliva, S. mutans and S. mitis biofilms were incubated in 5% CO2 for 24 h at 37 degrees C and were analyzed using confocal laser scanning microscopy. The lowest SR and highest SFE values were found in the control group. While the contact angle of control was statistically lower than composites, statistically difference was not found between composite groups. S. mutans adhesion of composites was significantly lower than control group, but there was no significant difference between composites. S. mitis adhesion of all groups was statistically similar. SR did not affect the S. mutans and S. mitis adhesion. Less adherence of S. mutans to low shrinkage composites was associated with low SFE and high contact angle values. Even though the highest SR was observed in the Charisma Diamond, no difference was found between the composites in terms of bacterial adhesion.