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Now showing 1 - 10 of 14
  • PublicationMetadata only
    The effect of home bleaching agents on the surface roughness of five different composite resins: A SEM evaluation
    (2016-05-01T00:00:00Z) Cengiz, Esra; Kurtulmus-Yilmaz, Sevcan; Ulusoy, Nuran; Deniz, ŞULE TUĞBA; Yuksel-Devrim, Ece; DENİZ, ŞULE TUĞBA
    The aim of this study was to investigate the effect of hydrogen peroxide (HP) and carbamide peroxide (CP) on the surface roughness of five different composite resins using profilometer and scanning electron microscope (SEM). Thirty-six specimens (1mm thick, 10mm in diameter) of five composite resins were fabricated. Each composite group was equally divided into three subgroups as control, CP and HP. In control group, specimens were stored in daily refreshed distilled water during the 14-day testing period. In other groups, 10% HP (Opalescence Treswhite) and 10% CP (Opalescence PF) were applied and surface roughness values (Ra) of each specimen were measured with a profilometer at the end of 14 days. Additionally, SEM analysis was performed to evaluate the surface deformations of composite resins. Data were analyzed with Kruskal-Wallis and Mann-Whitney U tests. Ra values of composite groups exposed to bleaching agents were statistically higher than control group (p<0.05). There was no significant difference between Ra values after HP and CP application within each composite group while SEM micrographs showed higher surface alterations at HP group compared to CP. Among the composite resins tested, Ceram-X Mono revealed the lowest Ra values after CP and HP applications as seen at SEM images. Home bleaching agents increased the surface roughness of all composites. Except CP applied Ceram-X mono specimens, Ra values of all composite resins evaluated in this study exceeded the critical limit of 0.2m. Ceram-X mono was the least affected composite material after bleaching application. SCANNING 38:277-283, 2016. (c) 2016 Wiley Periodicals, Inc.
  • PublicationMetadata only
    Effect of bleaching agents and whitening dentifrices on the surface roughness of human teeth enamel
    (2013-05-01T00:00:00Z) Ozkan, Pelin; Kansu, Gulay; Ozak, ŞULE TUĞBA; Kurtulmus-Yilmaz, Sevcan; Kansu, Pelin; DENİZ, ŞULE TUĞBA
    Objective. The aim of this in vitro study was to evaluate the surface roughness of human enamel bleached with 10% carbamide peroxide or 10% hydrogen peroxide bleaching agents at different times and also subjected to different superficial cleaning treatments. Materials and methods. One hundred and forty flat enamel samples were divided into 14 groups, Group 1-Group 14 (G1-G14). G1-G7 were treated with 10% carbamide peroxide and different dentifrices, G8-G14 were treated with 10% hydrogen peroxide and different dentifrices (G1 and G8: not brushed as control groups; G2 and G9: brushed with Ipana (R) toothpaste; G3 and G10: brushed with Clinomyn (R) toothpaste; G4 and G11: brushed with Moos Dent (R) toothpaste; G5 and G12: brushed with Signal (R) toothpaste; G6 and G13: brushed with Colgate (R) toothpaste; G7 and G14: brushed without dentifrice). A profilometer was used to measure average roughness values of the initial surface roughness and at each 7-day-interval. The bleaching was performed for 6 h a day and the surface cleaning treatment was performed 3-times a day, 2 min each time, for 4 weeks. The samples were stored in distilled water during the test period. Results. Statistical analysis revealed significant differences in surface roughness values over time for all groups except G1 and G8 (not brushed). The results of the surface roughness of all groups were nearly the same. Conclusions. The bleaching with 10% hydrogen peroxide and 10% carbamide peroxide did not alter the enamel surface roughness, but when the bleaching treatment was performed combined with abrasive dentifrices, a significant increase in roughness values was observed.
  • PublicationMetadata only
    Antimicrobial Activity of Ozone against Pathogenic Oral Microorganisms on Different Denture Base Resins
    (2019-06-07T00:00:00Z) Hayran, Yeliz; DENİZ, ŞULE TUĞBA; Aydin, Ali; DENİZ, ŞULE TUĞBA
    The present study aimed to evaluate the antimicrobial effect of gaseous ozone against specific oral pathogens on denture base resins. 1080 round samples were prepared (10mm-diameter, 2mm-thickness). Candida albicans, Streptococcus mutans, Streptococcus gordonii, and Aggregatibacter actinomycetemcomitans, polyamide-Deflex, heat-cured polymethyl-methacrylate (PMMA)-QC-20, and cold-cured-PMMA-Meliodent. The doses and durations: 25, 50 and 100 mu g/ml, 5, 10, 20, 30 minutes. For Cell viability (CV) MTT was used. 100 mu g/ml was most effective dose for C. albicans, S .gordonii, and A. actinomycetemcomitans were in heat-cured-PMMA and polyamide for S.mutans. For polyamide, lowest CV was 43% in S.mutans and A.actinomycetemcomitans. CV of heat-cure and cold-cure PMMA were 31% and 32% in S.gordonii, respectively. CV was similar for all resins and durations in S.mutans and A.actinomycetemcomitans and for polyamide for C.albicans and for heat-cure PMMA for S.gordonii. 30-min ozone application killed 80% of all microorganisms in all resins except for C.albicans in polyamide (65% cell death) and cold-cure PMMA (57% cell death). Optimal dose/duration combination was 100 mu g/ml-10 min. Gaseous ozone can be considered as an effective cleansing agent for denture base resins.
  • PublicationMetadata only
    Effect of atmospheric plasma versus conventional surface treatments on the adhesion capability between self-adhesive resin cement and titanium surface
    (2015-06-01T00:00:00Z) Seker, Emre; Kilicarslan, Mehmet Ali; Deniz, ŞULE TUĞBA; Mumcu, Emre; Ozkan, Pelin; DENİZ, ŞULE TUĞBA
    PURPOSE. The aim of this study was to evaluate the effects of atmospheric plasma (APL) versus conventional surface treatments on the adhesion of self-adhesive resin cement to Ti-6Al-4V alloy. MATERIALS AND METHODS. Sixty plates of machined titanium (Ti) discs were divided into five groups (n=12): 1) Untreated (CNT); 2) Sandblasted (SAB); 3) Tribochemically treated (ROC); 4) Tungsten Carbide Bur (TCB); 5) APL treated (APL). SEM analysis and surface roughness (Ra) measurements were performed. Self-adhesive resin cement was bonded to the Ti surfaces and shear bond strength (SBS) tests, Ra and failure mode examinations were carried out. Data were analyzed by one-way analysis of variance and chi-squared test. RESULTS. The lowest SBS value was obtained with CNT and was significantly different from all other groups except for APL. The ROC showed the highest SBS and Ra values of all the groups. CONCLUSION. It was concluded that the effect of APL on SBS and Ra was not sufficient and it may not be a potential for promoting adhesion to titanium.
  • PublicationMetadata only
  • PublicationMetadata only
    Farklı yapıdaki yapay dişlerin farklı sıvı ortamlardaki renk stabilitesi
    (2021-09-30T00:00:00Z) Deniz, Şule Tuğba; Özkan, Pelin; DENİZ, ŞULE TUĞBA
    Aim: New types of denture teeth using modified acrylic resin that incorporate cross-linking agents and composite resin containing different types of filler have become increasingly common. It has been possible to produce nano-sized filler particles with nanotechnology. However, evidence-based information regarding composition and properties is lacking. The purpose of this study was to evaluate the colour stability of four commercially available denture tooth materials with different chemical structure when subjected to various beverages.Methods: Conventional acrylic resin, reinforced acrylic resin, microfiller composite resin, and nanofiller composite resin teeth with different brands were used, for a total of four different denture teeth groups. Denture teeth were subjected to four beverages (tea, filtered coffee, cola, and cherry juice) and distilled water as control. The test period of 24 hours appears comparable to approximately 1 month of normal beverage consumption. The test periods used in this study were arranged according to this protocol and 1 week, 1 month, 3 months and 6 months of normal beverage consumptions were simulated. From each group, 10 maxillary first molar denture teeth were immersed in each of the five solutions. The baseline, 1st week, 1st month, 3rd month and 6th month values for colour change of denture teeth were measured. Results: The differences of each value were calculated by one-way ANOVA statistically. For colour changes (ΔE) there was no significant difference among the specimens immersed in distilled water (Tukey HSD test, p>0.01). The highest colour changes were recorded for the specimens of Integral and Major immersed in cola, whereas for the specimens of Veracia and Orthosit immersed in tea (Tukey HSD test, p<0.01). Conclusions: Within the limitations of this study, daily intake of common beverages may lead to colour changes of denture teeth. Microfiller composite resin denture tooth material is recommended due to its improved physical properties.
  • PublicationMetadata only
    The effect of home-bleaching application on the color and translucency of five resin composites
    (2013-11-01T00:00:00Z) Kurtulmus-Yilmaz, Sevcan; Cengiz, Esra; Ulusoy, Nuran; Ozak, ŞULE TUĞBA; Yuksel, Ece; DENİZ, ŞULE TUĞBA
    Objectives: The aim of this study was to investigate the effect of home bleaching agents on the color and translucency of resin composites.
  • PublicationMetadata only
    Evaluation of Oral-Health Quality of Life After Stabilization Splint Treatment For Temperomandubuler Disorders
  • PublicationMetadata 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, EVRIM
    The 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.
  • PublicationMetadata only
    Efficacy of denture cleaners on the surface roughness and Candida albicans adherence of sealant agent coupled denture base materials
    (2016-10-01T00:00:00Z) Koroglu, Aysegul; Sahin, Onur; Dede, Dogu Omur; Deniz, ŞULE TUĞBA; Sever, Nurdan Karacan; Ozkan, Serkan; DENİZ, ŞULE TUĞBA
    This study investigated the effect of denture cleansers on the surface roughness and Candida albicans adherence of surface sealant agent coupled denture base resins. One hundred and twenty specimens were fabricated from 2 polymethyl methacrylate (PMMA) (Meliodent; Acron MC) and 1 polyamide (Deflex) denture base materials, coated with a sealant agent (Palaseal) and divided into 4 groups (n=10) according to overnight cleaning procedures: distilled water (control), 5% sodium hypochlorite (NaOCl) and two different sodium perborate (Corega; Rapident). The surface roughness values were measured with a profilometer before (R(a)0) and after 90 days immersion in denture cleaners (R(a)1). Specimens were incubated with Candida albicans suspension and Candida colony forming units (CFU) (Cfu/mm) were counted. Significant differences were found, between the R(a)0 and R(a)1 values of 5% NaOCl applied Acron MC, Deflex and also Rapident applied Deflex groups (p<0.05). Denture cleaning procedures had no significant effects on the quantitiy of Candida albicans.