Araştırmacılar(3)

• Gömleksiz, Seda
• Karaarslan, Ayşegül
• Özkanoğlu, Seda

• ArticleAçık Erişim2026/r/ebyu/19215
  Color Matching Ability Among Single-Shade Resin Composites: Instrumental and Visual Evaluation

  Gömleksiz, Seda

  Background: This study aimed to evaluate the color-matching ability of 4 single-shade resin composites (RCs), using 2 different evaluation methods. Methods: One hundred and twelve specimens (8 × 2 mm) were fabricated in disc shape using 4 single-shade RCs (Omnichroma (OM), Essentia Universal (EU), Zenchroma (ZC), and Charisma Diamond One (CDO)) (n = 28). The specimens were randomly divided into 4 subgroups (na = 7), and cylindrical cavities (4 × 1 mm) were prepared in the center of each specimen. The cavities were then restored with either the same material or one of the other single-shade RCs. Color matching was measured instrumentally using a spectrophotometer and visually using a 0-4 scoring scale. Data were recorded and statistically analyzed (P < .05). Results: When instrumental analysis results were evaluated, ΔE00 values above the clinically acceptable threshold were observed in all groups except the control groups. The highest ΔE00 value was seen in the OM-EU group (P < .05); OM showed the worst color matching. The best color matching was observed in CDO. When visual analysis results were examined, the highest visual scores were seen in the EU-OM and ZC-OM groups (P < .05), whereas CDO presented the lowest visual scores. Conclusion: Color-matching ability of single-shade RCs varies depending on the material composition. Single-shade RCs with higher translucency after polymerization and enhanced optical design may provide better color matching. Some color differences detected instrumentally may not always be visually perceptible under clinical conditions.

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• ArticleYayıncıda açık erişim2026/r/ebyu/11427
  Cuspal Deflection and Marginal Adaptation in Premolars Restored with Low-Shrinkage Resin Composites

  Gömleksiz, Seda

  Objectives The aim of this in vitro study was to evaluate cuspal deflection and marginal adaptation in premolars restored with conventional and low-shrinkage resin composites (RCs). Materials and Methods Fifty-six maxillary first premolars with standardized MOD cavities were randomly assigned to four groups (n ¼ 14): Clearfil Majesty Posterior (CMP), Charisma Diamond (CHD), Beautifil II LS (BL), and Filtek Z550 (FZ). Cuspal deflection was measured using a digital micrometer as the linear distance between two reference points at baseline, 5 minutes, and 24 hours after restoration. Deflection values were calculated relative to the baseline. Three samples per group were evaluated using scanning electron microscopy to assess marginal adaptation. Statistical Analysis Data were analyzed using IBM SPSS Statistics V23.0. Data distribution was evaluated using the Shapiro-Wilk test. Kruskal-Wallis and one-way ANOVA tests were used according to data distribution, followed by appropriate post hoc tests. The significance level was set at p < 0.05. Results The amount of cuspal deflection at 5 minutes was greater than that observed at 24 hours in all groups. CMP, CHD, and BL showed lower cuspal deflection compared with FZ at all time intervals (p < 0.001). CMP exhibited the lowest cuspal deflection values, although no significant differences were found among the low-shrinkage RCs. Conclusion Modifications in the organic matrix or material formulation of the RCs can contribute positively to the control of cuspal deflection and support improved marginal adaptation. The reduced cuspal movement produced by low-shrinkage RCs may increase the likelihood of clinical success by helping preserve restoration integrity.

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• ArticleAçık Erişim2025/r/ebyu/19413
  Effect of Whitening Mouthrinses on Color Change of Stained Teeth: In Vitro Study

  Hubbezoglu, Ihsan; Gömleksiz, Seda

  Objective: This in vitro study aimed to evaluate the effectiveness of three different whitening mouthrinses on the color change and whiteness of stained teeth at different immersion times. Methods: Thirty-two human incisors teeth were stained in black tea solution for seven days and randomly divided into four groups, which were control (artifical saliva) and three whitening mouthrinses (containing tetrapotassium pyrophosphate, hydrogen peroxide, charcoal powder) (n=8). Spectrophotometric measurements were performed at baseline, after staining, after 12 hours, and 120 hours after keeping in whitening mouthrinses. The color changes and whiteness indexes occurring at different immersion times and after teeth staining were calculated. Results: The whitening mouthrinses tested showed similar changes in color change while exhibiting color change above the clinically acceptable threshold. Regarding whiteness index values, the highest value was obtained in the mouthrinse containing hydrogen peroxide with an immersion time of 120 hours (P < 0.05). While there was no significant difference in color change values at different immersion times, it was observed that the whiteness index values increased with increasing immersion time. Conclusion: Whitening mouthrinses can provide a clinically noticeable color change in discolored teeth. It can be said that using mouthrinses containing peroxide can provide more effective whitening on stained teeth.

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• ArticleAçık Erişim2025/r/ebyu/11594
  Effect of cavity depth on degree of conversion and microhardness of low-shrinkage resin composites

  Gömleksiz, Seda; Gömleksiz, Oğuzhan

  Background: The study aimed to investigate the effect of different cavity depths on the degree of conversion (DC) and surface microhardness (MH) of low-shrinkage resin composites. Methods: Three low-shrinkage resin composites (Clearfil Majestry Posterior/CMP, Beautifil II LS/BL, Charisma Diamond/CD) and one conventional nanohybrid resin composite (Filtek Z550/FZ) as control were evaluated. For each composite material, a total of 12 disc-shaped samples were prepared using plastic molds with two different depths (2 mm and 4 mm) (n = 6). The same sample preparation protocol was applied for the DC and MH tests, and a total of 96 samples were prepared, 48 for each test. Resin composites filled into molds with the incremental technique were cured with LED light unit only from the top surface. DC was determined by Fourier transform infrared (FTIR) spectroscopy; MH was determined using the Vickers hardness tester. Data were statistically analyzed using Robust and two-way variance analyses (p < 0.05). Results: For all resin composites, there was no significantly difference in DC and MH between the 2 mm and 4 mm cavity depths. BL showed the highest DC values at both cavity depths, while CD showed the lowest (p < 0.001). At both cavity depths, the highest MH values on bottom-top surfaces ​​were obtained in CMP, while the lowest ​​were in BL. The top surface MH values ​​were higher in all resin composites than the bottom surfaces. Conclusions: Increasing cavity depth may not negatively affect the DC and MH of low-shrinkage resin composites. Moreover, resin composite material formulations may have a higher potential effect on these parameters. Clinical trial number: Not applicable.

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• ArticleAçık Erişim2024/r/ebyu/19712
  The Effect of Various Surface Treatments and Materials on the Bond Strength in the Repair of Glass Hybrid Restorative Material

  Gömleksiz, Seda; Gömleksiz, Oğuzhan

  Objective: The purpose of this in vitro study is to evaluate the effect of various surface treatments (STs) and restorative materials on the shear bond strength (SBS) of glass hybrid (GH) restorative materials. Methods: Sixty-three GH restorative material samples (Equia Forte Fil, GC) were prepared (6 × 2 mm) and randomly divided into 3 groups according to the subsequent ST (n = 21): phosphoric acid etching (PA), aluminum oxide sandblasting (AO), and diamond bur roughening (DB). After that, 3 subgroups were created from the samples in each group based on the restoration material applied: Ionofil Molar AC (IM; Voco), Fuji II LC (FLC; GC), and Charisma Smart (CS; Kulzer). The bonded specimens were subjected to the SBS test. In addition, the samples were evaluated with a scanning electron microscopy. The results were statistically examined using twoway analysis of variance with post hoc test (P = .05). Results: The CS groups were higher in SBS compared to the other groups, whereas the IM groups had low bond strength (P < .05). The FLC, CS, DB, and PA groups showed the highest SBS (P < .05). The lowest SBS values were observed in the PA group in IM (P < .05). Conclusion: The GH restorative materials were successfully repaired with composite resin using diamond bur roughening or phosphoric acid etching.

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• ArticleYayıncıda açık erişim2024/r/ebyu/12498
  The effect of parental presence on the anxiety during first dental treatmein children

  Karaca, Serhat; Şirinoğlu Capan, Belen

  Objective: The aim of this study was to evaluate the effect of parental presence on dental anxiety in children during dental treatments. Materials and methods: The study was conducted with 194 children between January-April, 2020. The children were randomly divided into two subgroups. Children in group-I were treated in parent’s presence (pp), and in group-II in parent’s absence (pa). The Wong-Baker FACES Pain Rating Scale (WBFPS) and The Modified Dental Anxiety Scale (MDAS) were used for subjective measurements, whereas the objective measurement was performed by measuring the heart rate. Results: The mean age of 194 children was 6.26 ± 1.15 years, ranging from 5-8 years of age. The mean MDAS score of all children was 15.1 ± 4.72. No significant correlations were found in terms of dental anxiety between the children’s gender and age with heart rate, WBFPS and MDAS scores. Preoperative WBFPS scores (6.83 ± 1.04 pp and 7.01 ± 0.93 pa) were higher than postoperative scores (5.34 ± 2.11 pp and 5.74 ± 2.04 pa), with no statistically significant difference. Although there was no statistically significant results, the paediatric dentist observed a deterioration in the children’s behavior throughout the sessions in group-II compared to children in group-I. Conclusions: Parental presence has no statistically significant effect on dental anxiety in children during dental treatments.

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• ArticleAçık Erişim2024/r/ebyu/11995
  The effect of whitening toothpastes on the color stability and surface roughness of stained resin composite

  Gömleksiz, Seda; Okumuş, Ömer Faruk

  Background: This study aimed to investigate the effect of whitening toothpastes on the color stability and surface roughness of resin composites stained with coffee and cigarette smoke. Methods: Seventy-two disk-shaped specimens (6 × 2 mm) of suprananohybrid resin composite were randomly divided into two groups and exposed to coffee and cigarette smoke (n = 36). After staining, the samples randomly divided into four groups according to whitening toothpastes and were brushed for 4 min: Opalescence Whitening (OW); Colgate Optic White (COW); Curaprox Black is White (CPX) and, distilled water (control) (n = 9). Color was measured with spectrophotometer at the initial, after staining, and after brushing, and surface roughness was measured with profilometer at the initial and after brushing. A surface morphology analysis was examined using scanning electron microscopy and atomic force microscopy. The obtained data were statistically analyzed. (p < 0.05). Results: Cigarette smoke caused a significantly higher color change than coffee in the resin composite (p < 0.05). Brushing with hydrogen peroxide and silica-containing whitening toothpaste showed significant differences in color change (p < 0.05). The lowest whitening effect was found in activated charcoal-containing toothpaste. While all toothpastes increased the degree of surface roughness of resin composites, the highest roughness was caused by whitening toothpastes containing activated charcoal. (p < 0.05). Conclusions: The color stability and surface properties of resin composites can be affected by brushing them with whitening toothpaste. The utilization of whitening toothpaste containing hydrogen peroxide can be considered a safe method for increasing the whiteness of discolored resin composites.

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• ArticleYalnız künye2022/r/ebyu/13865
  The effect of contemporary finishing and polishing systems on the surface roughness of bulk fill resin composite and nanocomposites

  Gömleksiz, Seda; Gömleksiz, Oğuzhan

  Objective: To evaluate the effects of various finishing and polishing (F/P) systems regarding the surface roughness (Ra) value of two nanocomposites and a bulk fill resin composite. Methods and Materials: Three resin composites (Filtek Z550, Filtek Ultimate Body, Filtek Bulk Fill Posterior) were tested. Forty disk-shaped specimens of each material were cured under Mylar strip and then randomly divided into four subgroups according to the F/P method (n = 10): Control, Sof-Lex Spiral Wheels, Astropol, and Clearfil Twist Dia. Ra values was measured and the surfaces were examined under scanning electron microscope. The data were analyzed by generalized linear models (p < 0.05). Results: The Filtek Bulk Fill Posterior had the highest Ra value while Filtek Ultimate Body was the resin composite with the lowest roughness (p < 0.05). Considering the average Ra values after polishing, while the lowest Ra in all groups was obtained with the control group, the Clearfil Twist Dia showed similar Ra to the control group (p > 0.05). The samples polished with Sof-Lex Spiral Wheels had the highest Ra (p < 0.05). Conclusions: In addition to the resin composite type, the F/P technique greatly affected the Ra value of resin composite. The nanocomposites exhibited with the lowest Ra compared to the bulk fill resin composite after F/P. It was observed that the diamond containing-polishing system created smoother surfaces than the aluminum oxide containing- and silicon carbide containing-polishing systems. Clinical Significance: In terms of Ra, the nanocomposites exhibited better performance than the bulk fill resin composites. Nowadays, newly developed polishing systems containing diamonds can be successful at a comparable level to existing polishing systems. For this reason, these systems are preferable for polishing both nanocomposites and bulk fill resin composites.

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• ArticleYayıncıda açık erişim2021/r/ebyu/20837
  Hipomineralize Mine Defektlerinin Vital Beyazlatma Sonrası Er:Yag Lazer İle Minimal İnvaziv Rehabilitasyonu: Olgu sunumu

  Hubbezoglu, Ihsan; Gömleksiz, Seda; Akın, Emine Gülşah Göktolga

  Diş hekimliği uygulamalarında fonksiyon ve fonasyonun yanısıra doğal diş estetiğinin de hastaya yeniden kazandırılması gün geçtikçe önem kazanmaktadır. Estetik sorunların çözümünde günümüzde daha konservatif tedavi seçenekleri tercih edilmektedir. Son yıllarda teknolojik gelişmeleri takiben lazer uygulamaları oldukça popüler hale gelmiştir. Lazer teknolojisindeki gelişmelerle beraber her geçen gün lazerin diş hekimliğinde kullanımı ile ilgili olarak yeni olanaklar ortaya çıkmaktadır. Diğer geleneksel yöntemlere göre lazer uygulaması, lazer ışınının kolaylıkla yönlendirilebilmesi ve yüksek miktarda enerjinin küçük noktalara odaklanabilmesi nedeniyle oldukça ileri bir tedavi yöntemidir. Bu vaka sunumunda; ön grup dişlerdeki mine defektlerinin vital beyazlatma uygulaması sonrası, Er:YAG lazer ile defekten minimal doku kaldırılıp, direkt kompozit rezin ile restorasyonunun tamamlanması hedeflenmiştir.

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• ArticleYalnız künye2021/r/ebyu/14517
  Push-out bond strength of various surface treatments on fiber post to root canal dentine using different irrigation techniques

  Kırmalı, Ömer; Sekmen, Turan; Karaarslan, Ayşegül

  To compare the efficacy of different surface treatments (fiber post) with laser activated irrigation (LAI) technique (various root canal solutions) on root canal dentine in terms of push-out bond strength (PBS) in a fiber post. In this study, 200 premolars were assigned into groups according to various irrigation techniques: 2.5% sodium hypochlorite (NaOCl), 17% ethylene diamine tetra acetic acid (EDTA), and 17% EDTA + LAI. In addition, the fiber posts were separated into five groups, (n = 30) according to the surface pretreatment performed: sandblasting, hydrofluoric acid (HF), Erbium, Chromium:Yttrium Scandium-Gallium-Garnet (Er,Cr:YSGG) laser, Neodymium-Doped Yttrium Aluminum Garnet (Nd,YAG) laser and as untreated surface. The posts were cemented using dual-cure resin cement and subjected to a PBS test. Data were analyzed by one way-ANOVA, Tukey, and Tamhane T2 tests. The PBS values were increased in all parts of the tooth in the EDTA and EDTA + LAI treated groups and in groups treated with Er,Cr:YSGG laser fiber posts. In groups in which EDTA and EDTA + LAI were applied, it was observed that dentinal tubules were open according to the distribution and number of dentinal tubule configurations. The improvement of the PBS between fiber post/resin cement/root dentine was observed via the use of fiber post surface treatments with different irrigation techniques.

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