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Öğe Effect of desensitizers on the microleakage of previously restored Class V resin composite restorations(Taylor & Francis Ltd, 2016) Ozsoy, Alev; Eren, Meltem Mert; Gurbuz, Ozge; Dikmen, Benin; Cilingir, Aylin; Erdemir, UgurObjectives: The aim of this in vitro study was to evaluate the effect of different desensitizers' application on the microleakage of previously restored Class V composite resin restorations. Materials and methods: Class V cavities were prepared on the buccal surfaces of 40 extracted human third molars. Forty box-shaped cavities were divided into four groups, based on the desensitizers used (n = 10). All teeth were restored with the same bonding agent and composite material. No desensitizer was applied in the control group. In the experimental groups, BisBlock, Gluma and Universal bonding agents were the desensitizers. The desensitizers were applied after completion of composite restorations according to manufacturers' instructions. All specimens were then thermocycled at 5-55 degrees C, with a 10-s dwell time for 500 cycles. The samples were then immersed in 0.5% methylene blue dye for 24 h, sectioned into two equal halves, evaluated for microleakage using a stereomicroscope at 30x magnification and scored on a scale of 0-3. The data were analysed using the Kruskal-Wallis test at the significance level p < 0.05. Results: There were no significant differences in microleakage after desensitizer application (p > 0.05). However, based on the obtained numerical values in our study, while the BisBlock and bonding groups showed lower microleakage at the occlusal margin, BisBlock, Gluma and bonding group showed lower microleakage at the gingival margin compared to the control group. Conclusions: The application of desensitizers as a post-treatment option could be considered an advisable procedure to minimize microleakage.Öğe Effect of Different Antioxidants on the Microtensile Bond Strength of an Adhesive System to Sodium Hypochlorite-treated Dentin(Quintessence Publishing Co Inc, 2015) Dikmen, Benin; Gurbuz, Ozge; Ozsoy, Alev; Eren, Meltem Mert; Cilingir, Aylin; Yucel, TanerPurpose: To evaluate the effects of different antioxidant treatments on the microtensile bond strength of an adhesive system to sodium hypochlorite (NaOCl)-treated dentin. Materials and Methods: Thirty extracted third molars were sectioned 3 mm below the occlusal surface and divided into six groups according to the antioxidant treatment received: control group: distilled water; NaOCl group: 5.25% NaOCl and distilled water; proanthocyanidin (PA) group: 5.25% NaOCl, 5% PA and distilled water; 1-week storage group: 5.25% NaOCl and storage for 1 week in distilled water; Accel group: 5.25% NaOCl, Accel, and distilled water; noni group: 5.25% NaOCl, noni fruit juice, and distilled water. NaOCl, PA, Accel, noni, and distilled water were administered for 30 s, 10 min, 30 s, 10 min, and 30 s, respectively. A self-etching adhesive system (Single Bond Universal Adhesive) was applied to each specimen and a resin composite (Filtek Z550) was built up to a height of 5 mm on the dentin surface. Each specimen was serially sectioned to obtain sticks with a cross-sectional area of 1 mm(2), and their microtensile bond strength was determined. Statistical differences between groups were analyzed using one-way ANOVA and Tamhane's T2 test. Results: Microtensile bond strength in the NaOCl group was significantly lower than in all other groups. However, there were no significant differences in the bond strength between the groups treated with different antioxidants. Conclusions: NaOCl significantly reduced the microtensile bond strength of the adhesive system. The application of PA, Accel, and noni fruit juice to NaOCl-treated dentin significantly improved the microtensile bond strength.Öğe Effect of surface sealant on the surface roughness of different composites and evaluation of their microhardness(Istanbul Univ Press, Istanbul Univ Rectorate, 2020) Gurbuz, Ozge; Cilingir, Aylin; Dikmen, Benin; Ozsoy, Alev; Eren, Meltem MertPurpose The aim of this study was to evaluate the effect of a surface sealant on the surface roughness of different composites and compare their microhardness values. Materials and Methods Sixty disc-shaped specimens were prepared and assigned to 6 groups (n = 10). Groups were prepared as follows; Group 1 (Herculite XRV Ultra), Group 2 (Beautifil Bulk Restorative) and Group 3 (Filtek Bulk Fill Posterior Restorative). Groups 4, 5, and 6 were prepared by applying a surface sealant (BisCover LV) on the specimens in groups 1, 2 and 3. Surface hardness of the discs in group 1, 2, and 3 and surface roughness of the discs in all groups were measured using the Vickers hardness test and a profilometer, respectively. One-way ANOVA was used to test for differences among the groups. Results No significant differences were observed in the microhardness and roughness between the experimental and control groups for each restorative materials. Group 3 showed the highest surface hardness and group 4 showed the lowest surface roughness values. Conclusion Using the BisCover LV resin after the polishing step has no significant effect on the surface roughness. The highest hardness values were obtained for the Filtek Bulk Fill Posterior Restorative after the polishing step. The smoothest surfaces were obtained for all experimental groups using the BisCover LV resin after the polishing step, Herculite XRV Ultra showed lower average roughness values than the other materials.Öğe Giomer Bulk-Fill, Hibrit Bulk-Fill ve Nano-HibritKompozitlerin Farklı Uygulama Protokolleri KullanılarakMekanik Özelliklerinin Karşılaştırılması: İn Vitro Çalışma(2021) Çilingir, Aylin; Eren, Meltem Mert; Dikmen, Benin; Gürbüz, Özge; Özsoy, AlevAmaç: Bu çalışmada, farklı tabaka kalınlıklarında uygulanan düşükve yüksek viskoziteli bulk-fill giomerler, bir nano-hibrit kompozit ve birbulk-fill hibrit kompozitin basma dayanımlarıyla bükülme dayanımlarınınkarşılaştırılması amaçlanmıştır. Gereç ve Yöntemler: Kompozit malzeme lerin basma dayanımlarının değerlendirilmesi amacıyla 6 grupta (n=10) top lam 60 adet silindir şeklinde örnek (6x3mm) hazırlanmıştır. Deney grupları aşağıdaki şekildedir:Grup 1 (G1) Tetric N-Ceram (TNC) (2+2+2 mm),Grup 2 (G2) Tetric N-Ceram Bulk-Fill (TBF) (4+2 mm),Grup 3 (G3) Beautifill Bulk-Fill Flowable (BBF) (4+2 mm),Grup 4 (G4) Beautifill Bulk Restorative (BBR) (4+2 mm),Grup 5 (G5) 2 mm BBF+4 mm BBR,Grup 6 (G6) 4 mm BBF+2 mm BBR.Örnekler 1 mm/dk kafa hızında basma dayanımı testine tabi tutulmuştur.Bükülme dayanımı ve bükülme modülüsünün hesaplanabilmesi amacıyla40 adet (25x2x2 mm) (n=10) kompozit örnek hazırlanmış [TNC (GF1), TBF(GF2), BBR (GF3), BBF (GF4)] ve 3 nokta bükülme testi (0,5 mm/dk) ger çekleştirilmiştir. Elde edilen veriler, tek yönlü ANOVA ve Tamhane T2 test leri kullanılarak değerlendirilmiştir (p<0,05). Bulgular: G6’nın basmadayanımı ortalaması, G1, G2, G3, G4 ve G5 gruplarından anlamlı şekildeyüksek bulunmuştur (p<0,01). Diğer grupların basma dayanımı ortalama ları arasında istatistiksel olarak anlamlı bir farklılık bulunmamaktadır(p>0,05). GF4’ün ortalama bükülme dayanımı, GF1, GF2 ve GF3 grupla rından istatistiksel olarak anlamlı derecede yüksek bulunurken, diğer grup lar arasında anlamlı bir fark bulunamamıştır. Sonuç: En yüksek basma vebükülme dayanımı değerleri, bulk-fill giomerlerle elde edilmiştir. BBR al tında uygulandığında BBF kalınlığını 2 mm’den 4 mm’ye çıkarmak, basmadayanımını istatistiksel olarak anlamlı şekilde artırmıştır.
