Person: DALKILIÇ, EVRIM
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Publication Metadata only Effect of titanium dioxide nanotubes on the mechanical and antibacterial properties of the low-viscosity bulk-fill composite(2021-10-01T00:00:00Z) ÖZLEN, RÜMEYSA HATİCE; DALKILIÇ, Evrim; KÜÇÜKYILDIRIM, Bedri Onur; AKDOĞAN EKER, Ayşegül; Topcuoglu, Nursen; Kulekci, Guven; ÖZLEN, RÜMEYSA HATİCE; DALKILIÇ, EVRIMThe purpose of this investigation is to determine the impact of titanium dioxide nanotubes (TiO2-n) on the mechanical and antibacterial properties of bulk-fill composite resin. TiO2-n were synthesized in laboratory conditions using the hydrothermal method. Varying amounts of TiO2-n were included in the bulk-fill composite resin. Microhardness, surface roughness, and the three-point bending test were used to determine the mechanical properties of the composite. After the flexural strength test, the fractured surfaces of the composite resin were examined with a high-resolution scanning electron microscope. The antibacterial activity of Streptococcus mutans (S.mutans) and Lactobacillus Casei (L.casei) was assessed using a direct contact test. The statistical examination was completed using IBM SPSS Statistics 22. Group differences were compared using the Kruskal Wallis and Dunn tests (p 0.05). Adding 0.5% and 1% TiO2-n increased the microhardness of the bulk-fill composite (p 0.05). Though adding TiO2-n did not have an antibacterial impact on S.mutans (p > 0.05), adding 0.5% TiO2-n produced an antibacterial impact on L.casei in daylight (p < 0.05). The addition of 0.5% and 1% TiO2-n increased the microhardness of the top surface of the bulk-fill composite without negatively affecting surface roughness or the composite-s three-point bending properties Adding 0.5% TiO2-n to the composite resin produced an antibacterial impact on L.casei in daylight.Publication Metadata only Shear Bond Strength of Indirect Pulp Capping Materials to Caries-Affected Dentin(2021-04-22T00:00:00Z) Özduman, Zümrüt Ceren; Oğlakçı, Burcu; Dalkılıç, Evrim; ÖZDUMAN, ZÜMRÜT CEREN; OĞLAKÇI, BURCU; DALKILIÇ, EVRIMAim: To evaluate the shear bond strength (SBS) of indirect pulp capping materials to cariesaffected dentin (CAD) with/without chlorhexidine (CHX) pretreatment.Materials and Methods: Coronal dentin surfaces of 150 extracted sound human molar teeth wereground flat. Artificial CAD were obtained. Half of the specimens were pretreated with 2%CHX andhalf of them received no-pretreatment before the application of indirect pulp capping materials(n=15). Five materials were assessed: 1-Conventional glass ionomer cement (Fuji IX, GC, Japan)(CGIC) 2-Resin modified glass ionomer cement (Fuji II GC, Japan) (RMGIC), 3-Resin modified glassionomer bioactive cement (Activa Bioactive, Pulpdent, USA) (ACT) 4-Resin modified tricalciumsilicate (Theracal, Bisco, USA) (RMCS), 5-Water-based tricalcium silicate, (Biodentine, Septodont,France) (WBCS). To evaluate the SBS, the Universal Test machine was used (1mm/min).Data were evaluated by Student’s t-test and one-way ANOVA. The differences betweengroups were analyzed by Mann-Whitney U and Kruskal-Wallis test. Pairwise comparisons weredetermined with the post-hoc Tukey HSD or Dunn-Bonferroni test. Unless otherwise stated,results for p<0.05 were considered statistically significant. Bonferroni Correction was made tocontrol Type I error in multiple comparisons.Results: Among the groups without pretreatment; SBS of RMCS [0.72(0.59-1.09) MPa] and WBCS[0.89 (0.31-1.05) MPa] were found to be significantly lower compared to ACT [4.37(3.34-6.45) MPa],CGIC [2.52(1.88-6.36) MPa] and RMGIC [5.24(3.23-8.27) MPa] (p<0.01). There were no significantdifferences between Group ACT, CGIC and RMGIC and between Group RMCS and WBCS(p>0.05).Among the CHX pretreated samples, SBS of Group RMCS [0.43(0.14-0.86) MPa] and WBCS[0.21(0.16-0.35) MPa] were found to be significantly lower than Group ACT [4.33(2.68-7.06) MPa],CGIC [4.36(3.61-7.44) MPa] and RMGIC [7.56(6.38-10.29) MPa] (p<0.01). There were no significantdifferences between Group ACT, CGIC and RMGIC and between Group RMCS and WBCS (p>0.05).There was no statistically significant difference between the groups with and without CHXpretreatment in all materials (p>0.010) except for WBCS. CHX pretreated WBCS group showedlower SBS than the WBCS/without CHX (p=0.007).Conclusion: Tricalcium silicate-based materials had lower shear bond strength than glassionomer-based materials, both with and without pre-treatment of CHX.*This study was funded by Scientific and Technological Research Council of Turkey (TUBITAK)(ProjectNo:119S048)Keywords: indirect pulp capping material, shear bond strength, caries affected dentinPublication Metadata only Influence of fiber insertion and different material type on stress distribution in endocrown restorations: a 3D-FEA study.(2021-12-29T00:00:00Z) Yildirim, Gulhan; Demir, Cihan; Güven, Melahat Çelik; Koç, Osman; Dalkiliç, Evrim; DALKILIÇ, EVRIMPublication Metadata only Effect of TiO2-n on the Antibacterial Properties of Low – Viscosity Bulk - Fill Composite(2021-04-22T00:00:00Z) Topcuoğlu, Nursen; Dalkılıç, Evrim; Küçükyıldırım, Bedri Onur; Akdoğan Eker, Aysegül; Külekçi, Hatice Güven; DALKILIÇ, EVRIMPublication Metadata only The effect of fiber insertion on fracture strength and fracture modes in endocrown and overlay restorations.(2021-12-29T00:00:00Z) Fildisi, Mehmet Ali; Eliguzeloglu Dalkilic, Evrim; DALKILIÇ, EVRIMPublication 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 Metadata only Effect of Povidone-Iodine and Hydrogen-Peroxide Mouthwashes on Shear Bond Strenth to Enamel(2021-04-22T00:00:00Z) Doğan, Miraç; Değer, Ceren; Özduman, Zümrüt Ceren; Oğlakçı, Burcu; Dalkılıç, Evrim; DOĞAN, MİRAÇ; DEĞER, CEREN; ÖZDUMAN, ZÜMRÜT CEREN; OĞLAKÇI, BURCU; DALKILIÇ, EVRIMAim: During COVID-19 pandemic, use of different mouthwashes have been recomended toreduce the viral load. Aim of this study is to compare the effect of different mouthwashes onshear bond strength of a universal adhesive in regard to self-etch (SE) and etch and rinse (ER)application modes.Materials and Methods: 100 sound human maxillary central incisors were selected. Flat enamelsurfaces were obtained. Specimens were randomly assigned to 5 groups (n=20) [Control, 1.5%hydrogen-peroxide(H2O2), 0.2% povidone-iodine (PVP-I), Listerine, Chlorhexidine (CHX)]. Then,each group was divided into two subgroups according the application mode of the useduniversal adhesive (Single Bond Universal) (n =10). After adhesive procedures, resin compositewas applied by a Teflon mold (2mm height, 2.4mm diameter) and light polymerized. Shear bondstrength was tested with a Universal testing machine after water storage for 24 h. The debondedareas were examined for failure mode analysis with a stereomicroscope at 25×magnifications.The data were statistically analyzed by two-way ANOVA and Bonferroni test (p<0.05).Results: Etch and rinse application mode of the adhesive system led to higher shear bond strengthsthan self-etch application mode, regardless of the preoperational antiseptic mouthwashes used(p<0.001). The lowest shear bond strength values among all the tested groups were measuredfor H2O2/SE group (3.77±1.37MPa). The control group (where no mouthwash was used) exhibitedthe highest SBS values (26.43±4.35MPa) in SE mode (PVP-I/SE=8.70±1.92, Listerine/SE=9.99±2.90;CHX/SE=17.67±4.37MPa) (p<0.05). PVP-I/ER group (24.04±5.01MPa) showed no significantdifference with H2O2, CHX, Listerine and control groups in ER mode (21.40±3.67, 28.30±6.03,29.61±4.78, 31.48±7.45) (p>0.05). H2O2 presented lower shear bond strength (21.40±3.67MPa) thanother mouthwashes in ER mode (p<0.05). The adhesive failure mode was predominant for allgroups.Conclusion: The antiseptic mouthwashes decreased the enamel bond strength of the universaladhesive used in self-etch application mode, however only H2O2 reduced the enamel bondstrength in both application modes.Keywords: hydrogen peroxide, mouthwash, povidone iodine, shear bond strength, chlorhexidinePublication Metadata only The Effect of Prophylactic Polishing Protocols on Surface Roughness of Different Resin Composites(2021-04-22T00:00:00Z) Fazlıoğlu, Leyla; Oğlakçı, Burcu; Özduman, Zümrüt Ceren; Dalkılıç, Evrim; FAZLIOĞLU, LEYLA; OĞLAKÇI, BURCU; ÖZDUMAN, ZÜMRÜT CEREN; DALKILIÇ, EVRIMAim: The aim of this study was to evaluate the effect of prophylactic polishing paste and airpolishingon the surface roughness of different resin composites.Materials and Methods: In this study, three different resin composites were used: nanohybrid(Charisma Topaz, Kulzer GmbH), low-viscosity bulk-fill (Metafil Bulk Fill, Sun Medical) and highviscositybulk-fill (Filtek Bulk Fill, 3M ESPE) resin composites (n=40). Totally 120 disc-shapedspecimens (diameter: 4mm, thickness: 2 mm) were fabricated using Teflon molds. All specimenswere polymerized with LED light-curing device (1000 mW/cm2) according to the manufacturers’instructions. All specimens were polished with a series of aluminum oxide polishing discs (OptiDisc,Kerr) and subdivided into four groups according to the different prophylactic polishing protocols(n=10): 1) no prophylactic polishing protocol (control), 2) polishing paste, 3) air-polishing, 4) airpolishing+polishing paste. Then, the surface roughness (Ra,mm) were measured at 4 differentpoints of the top surfaces by a contact profilometry (Marsurf M 300 C). Data were statisticallyanalyzed with two-way ANOVA and Bonferroni tests (p<0.05).Results: Regarding the polishing protocols, for Metafil Bulk Fill and Charisma Topaz, control(0,550±0,170), (0,365±0,090) and polishing paste (0,615±0,083), (0,424±0,065) groups showedsignificantly lower surface roughness than air-polishing (0,748±0,181), (0,603±0,069) and airpolishing+ polishing paste (0,899±0,110), (0,577±0,087) groups, respectively. However, nosignificant differences were observed between control and polishing paste groups. For FiltekBulk Fill, air-polishing group (0,657±0,059) showed significantly higher surface roughnessthan polishing paste group (0,531±0,093). Regarding the resin composites, for control group,Charisma Topaz (0,365±0,090) showed significantly lower surface roughness than Metafil BulkFill (0,550±0,170) and Filtek Bulk Fill (0,632±0,109). For air-polishing and polishing paste groups,Metafil Bulk Fill showed significantly higher surface roughness than Charisma Topaz. For airpolishing+ polishing paste groups, Metafill Bulk Fill (0,899±0,110) showed significantly highersurface roughness than Charisma Topaz (0,577±0,087) and Filtek Bulk Fill (0,596±0,089).Conclusion: Air-polishing caused higher surface roughness than polishing paste for all testedcomposites. Besides, low-viscosity bulk-fill showed higher surface roughness than nanohybridcomposite for all polishing protocols.Publication Metadata only The Effect of Different Polishing Systems on the Surface Roughness of Nanocomposites: Contact Profilometry and SEM Analyses.(2021-06-30T00:00:00Z) Oglakci, B; Kucukyildirim, B O; Özduman, Z C; Eliguzeloglu Dalkilic, Evrim; 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, EVRIM