Person: OĞLAKÇI, BURCU
9 results
Search Results
Now showing 1 - 9 of 9
Publication Metadata only Volumetric change and gap formation in class V composite restorations: a micro-CT analysis(2020-07-01T00:00:00Z) OĞLAKÇI, Burcu; Halacoglu, Derya Merve; ÖZDUMAN, ZÜMRÜT CEREN; Dalkilic, Evrim; OĞLAKÇI, BURCU; ÖZDUMAN, ZÜMRÜT CEREN; DALKILIÇ, EVRIMThisin vitrostudy evaluated the volumetric change (VC) and gap formation (GF) in Class V composite restorations after light-curing and aging. Thirty-six extracted human premolars were used. Standardized Class V cavities (3 mmx3 mmx1.5 mm) were prepared. G-Premio Bond was applied. The teeth were randomly assigned into six groups (n = 6): Group FZ: Filtek Z250(microhybrid), Group SP: SDR Plus Bulk Fill Flowable (low-viscosity bulk-fill), Group EB: Estelite Bulk Fill Flow (low-viscosity bulk-fill), Group GI: G-aenial Universal Injectable (highly-filled low-viscosity), Group AF: Admira Fusion (ormocer), Group SX: Solare X (nanohybrid). Each specimen was scanned four times with micro-CT (SkyScan 1174v2, Belgium): after cavity preparation, before and after light-curing, and after aging. The VC (%) and GF (mm(3)) parameters were quantified and analysed. Then, VC after light-curing was verified with AcuVol video image analyser (n = 6). The specimens were submitted to 10,000 thermocycles (5-55 degrees C) and 100,000 load cycles (50N). The data were statistically analysed using the Kruskal-Wallis, Wilcoxon and Dunn tests (p < 0.05). After light-curing, Group AF and FZ showed significantly lower VC than Group GI. Group GI showed significantly higher total GF than Group AF, EB, FZ and SX. Group GI showed significantly higher GF than Group AF, EB and FZ in cervical region. After aging, a significant increase in the volume of the gap (VG) in cervical region was found for Group FZ and GI (p < 0.05). After light-curing, ormocer and microhybrid composites exhibited lower VC and GF than highly-filled low-viscosity composites. After aging, an increase in VG was observed for microhybrid and highly-filled low-viscosity composites for cervical region.Publication 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 Profilaktik Polisaj Protokollerinin Farklı Rezin Kompozitlerin Yüzey Pürüzlülüğü Üzerine Etkisi(2021-12-01T00:00:00Z) Oğlakçı, Burcu; Fazlıoğlu, Leyla; Özduman, Zümrüt Ceren; Dalkılıç, Evrim; OĞLAKÇI, BURCU; FAZLIOĞLU, LEYLA; ÖZDUMAN, ZÜMRÜT CEREN; DALKILIÇ, EVRIMPublication Open Access How does antiseptic mouthwashes against SARS-COV-2 affect the bond strength of universal adhesive to enamel?(2021-12-01T00:00:00Z) Özduman, Zümrüt Ceren; Oğlakçı, Burcu; Doğan, Miraç; Değer, Ceren; Dalkılıç, Evrim; ÖZDUMAN, ZÜMRÜT CEREN; OĞLAKÇI, BURCU; DOĞAN, MİRAÇ; DEĞER, CEREN; DALKILIÇ, EVRIMPublication Metadata only Smoothielerin nano kompozit rezinlerin mikrosertlik ve renk değişimi üzerine etkisi(2021-03-01T00:00:00Z) Oğlakçı, Burcu; Fazlıoğlu, Leyla; Tunç, Ayşenur; Özduman, Zümrüt Ceren; Dalkılıç, Evrim; OĞLAKÇI, BURCU; FAZLIOĞLU, LEYLA; TUNÇ, AYŞENUR; ÖZDUMAN, ZÜMRÜT CEREN; DALKILIÇ, EVRIMPublication Metadata only Farklı üniversal adeziv sistemler ile hemen dentin kapama işleminin kendinden bağlanabilen yapıştırma simanının bağlanma dayanımı üzerine etkisi(2022-03-01T00:00:00Z) Deniz, Şule Tuğba; Oğlakçı, Burcu; Dalkılıç, Evrim; OĞLAKÇI, BURCU; DALKILIÇ, EVRIMPublication Metadata only The effect of immediate dentin sealing with chlorhexidine pretreatment on the shear bond strength of dual-cure adhesive cement(2021-07-01T00:00:00Z) DENİZ, ŞULE TUĞBA; OĞLAKÇI, Burcu; Yesilirmak, Sevda Ozturk; DALKILIÇ, Evrim; DENİZ, ŞULE TUĞBA; OĞLAKÇI, BURCU; DALKILIÇ, EVRIMThe purpose of this in vitro study was to evaluate the effect of immediate dentin sealing (IDS) with and without chlorhexidine (CHX) pretreatment on the shear bond strength (SBS) of dual-cure adhesive resin cement. Mid-coronal dentin surfaces were obtained from 75 human molars. They were randomly allocated into five groups in accordance to type of IDS [etch&rinse/ER (Adper Single Bond2) and universal/U adhesive systems (Single Bond Universal)] and presence of CHX application (n = 15): Group ER; Group ER + CHX; Group U; Group U + CHX; and Group C (no IDS). Dual-cure adhesive resin cements were bonded with a cylinder-shaped Teflon mold. The SBS was measured using a universal test machine. Fracture type was evaluated with stereomicroscope. The resin/dentin interfaces were examined with an environmental scanning electron microscope. Data were statistically analyzed with two-way analysis of variance and Bonferroni tests (p .05). Group U + CHX showed significantly higher SBS than Group C (p .05). The prevalent failure mode was the mixed type for most of the groups. Group C exhibited an intact and regular hybrid layer with no resin tag, whereas longer and clear resin-tag formation was visible for Group U + CHX. CHX pretreatment improved the bond strength between adhesive resin cement and dentin when IDS treatment was performed with a universal adhesive system.Publication Metadata only The shear bond strength of repaired high-viscosity bulk-fill resin composites with different adhesive systems and resin composite types(2019-07-18T00:00:00Z) OĞLAKÇI, Burcu; Arhun, Neslihan; OĞLAKÇI, BURCUPublication 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.