Person: OĞLAKÇI, BURCU
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Publication Metadata only The color change of a novel single-shade composite immersed in different beverages.(2022-12-01) Fazlıoğlu L.; Oğlakçı B.; Özduman Z. C.; Dalkılıç E.; FAZLIOĞLU, LEYLA; OĞLAKÇI, BURCU; ÖZDUMAN, ZÜMRÜT CEREN; DALKILIÇ, EVRIMPublication Metadata only CAD/CAM SİSTEMLERİNDE KULLANILAN KOMPOZİT REZİN BAZLI MATERYALLER VE TAMİR YÖNTEMLERİ(AKADEMİSYEN YAYINEVİ, 2022-01-01) ÖZDUMAN Z. C.; OĞLAKÇI B.; ÖZDUMAN, ZÜMRÜT CEREN; OĞLAKÇI, BURCUPublication Metadata only The Effect of Curing Modes and Times of Third-Generation Led LCU on the Mechanical Properties of Nanocomposites(2022-09-01T00:00:00Z) OĞLAKÇI, Burcu; Ozlen, Rumeysa Hatice Enginler; DEMİRKOL, Metehan; ÖZDUMAN, ZÜMRÜT CEREN; KÜÇÜKYILDIRIM, Bedri Onur; DALKILIÇ, Evrim; OĞLAKÇI, BURCU; ÖZDUMAN, ZÜMRÜT CEREN; DALKILIÇ, EVRIMThis study evaluates the effect of curing modes and times on the mechanical properties of nanocomposites. Two nanocomposite resins were investigated: supra-nanohybrid (Estelite Posterior Quick; EP) and nanohybrid (Solare X; SX). They were polymerized with a light-emitting diode light-curing units (LED LCU, Valo) as follows: standard mode for 20s (ST20), high power mode for 12s (HP12), high power mode for 20s (HP20), extra power mode for 6s (XP6), and extra power mode for 20s (XP20). For Vickers microhardness (HV), disc-shaped specimens were fabricated (n=10). For the three-point bending test, bar-shaped specimens were fabricated (n=10). Flexural strength and resilience modulus were calculated. The fractured surfaces and specimen surfaces of composites were observed using scanning electron microscopy. The data were analyzed with repeated measures ANOVA, two-way variance, and Bonferroni tests (p<0.05). On the top and bottom surfaces of the EP nanocomposite resin, ST20 and HP12 revealed statistically higher HV than with XP6. Moreover, HP20 and XP20 had statistically higher HV than HP12 and XP6. For the SX nanocomposite resin, HP20 had statistically higher HV than HP12. For EP and SX, there were no significant differences in flexural strength and resilience modulus regarding the curing modes and times. Furthermore, SX demonstrated lower mechanical properties than EP. Scanning electron microscopy indicated that both nanocomposites had similar surface appearances. However, with all curing modes and times, SX exhibited layered fractures and more crack formations than EP. Different curing modes and times could influence the microhardness of nanocomposites.Publication Metadata only DİŞ HEKİMLİĞİNDE CAD/CAM TEKNİĞİNDE KULLANILAN SERAMİK ESASLI RESTORATİF MATERYALLER(AKADEMİSYEN YAYINEVİ, 2022-01-01) OĞLAKÇI B.; ÖZDUMAN Z. C.; OĞLAKÇI, BURCU; ÖZDUMAN, ZÜMRÜT CERENPublication Open Access The use of a liner under different bulk-fill resin composites: 3D GAP formation analysis by x-ray micro-computed tomography(2020-01-01T00:00:00Z) OĞLAKÇI, BURCU; Kazak, Magrur; DÖNMEZ, NAZMİYE; Dalkilic, Evrim; KÖYMEN, SAFİYE SELİN; OĞLAKÇI, BURCU; KAZAK, MAĞRUR; DÖNMEZ, NAZMİYE; DALKILIÇ, EVRIM; KÖYMEN, SAFİYE SELİNGap formation of composite resin restorations is a serious shortcoming in clinical practice. Polymerization shrinkage stress exceeds the tooth-restoration bond strength, and it causes bacterial infiltration within gaps between cavity walls and the restorative material. Thus, an intermediate liner application with a low elastic modulus has been advised to minimize polymerization shrinkage as well as gap formation. Objective: The purpose of this in vitro study was to assess gap formation volume in premolars restored with different bulk-fill composites, with and without a resin-modified glass-ionomer cement (RMGIC) liner, using x-ray micro-computed tomography (micro-CT). Methodology: Sixty extracted human maxillary premolars were divided into six groups according to bucco-palatal dimensions (n=10). Standardized Class II mesio-occluso-distal cavities were prepared. G-Premio Bond (GC Corp., Japan) was applied in the selective-etch mode. Teeth were restored with high-viscosity (Filtek Bulk Fill, 3M ESPE, USA)-FB, sonic-activated (SonicFill 2, Kerr, USA)-SF and low viscosity (Estelite Bulk Fill Flow, Tokuyama, Japan)- EB bulk-fill composites, with and without a liner (Ionoseal, Voco GmbH, Germany)-L. The specimens were subjected to 10,000 thermocycles (5-55oC) and 50,000 simulated chewing cycles (100 N). Gap formation based on the volume of black spaces at the tooth-restoration interface was quantified in mm3 using micro-computed tomography (SkyScan, Belgium), and analyses were performed. Data were analyzed using repeated-measures ANOVA and the Bonferroni correction test (p < 0.05). Results: The gap volume of all tested bulk-fill composites demonstrated that Group SF (1.581±0.773) had significantly higher values than Group EB (0.717±0.679). Regarding the use of a liner, a significant reduction in gap formation volume was observed only in Group SFL (0.927±0.630) compared with Group SF (1.581±0.773). Conclusion: It can be concluded that different types of bulk-fill composite resins affected gap formation volume. Low-viscosity bulk-fill composites exhibited better adaptation to cavity walls and less gap formation than did sonic-activated bulk-fill composites. The use of an RMGIC liner produced a significant reduction in gap formation volume for sonic-activated bulk-fill composites.Publication Metadata only Surface Roughness of Flourid-Releasing Restorative Materials With Different Finishing Polishing Systems(2023-12-05) Halıcı Ortega Guardia I.; Özyazıcı G.; Değer C.; Özduman Z. C.; Oğlakçı B.; DEĞER, CEREN; ÖZDUMAN, ZÜMRÜT CEREN; OĞLAKÇI, BURCU