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Browsing by Author "Kara, E."

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    Article
    Evaluation the Effect of Different Antioxidants Applied After Bleaching on Teeth Color Stability
    (Universidade Estadual Paulista, Institute of Science and Technology of Sao Jose dos Campos, 2020) Degirmenci, A.; Kara, E.; Degirmenci, B.U.; Ozcan, M.
    Objective: Vital bleaching is a popular treatment option for discolored teeth; but at post-treatment stage, loss of adhesion is highly reported. Literature focused on antioxidant application for the answer of this issue. The aim of this study was to compare the effects of six different antioxidants on color stability of bleached teeth. Material and Methods: This study included total of 84 extracted intact non-carious lower incisors. 35% hydrogen peroxide was applied on the labial surfaces of specimens in accordance with manufacturer’s instructions. The bleached teeth were divided into 7 groups. No antioxidants were applied to the control group. For the experimental groups, the following antioxidants were applied for 10 minutes each: 5% proanthocyanidin, 5% sodium ascorbate, 5% lycopene, %5 green tea, %5 white tea and %5 α-tocopherol. CIE L*, a* and b* values of the teeth were measured by a spectrophotometer. One-way ANOVA was used to determine the differences among the groups. Multiple comparisons were examined with Tukey HSD. Results: The one-way ANOVA test revealed a statistically significant difference between the groups (p<0.005). Highest color change was observed in lycopene group and the lowest in green tea group. Conclusion: Proanthocyanidin, white tea and green tea could be considered as post-bleaching antioxidant alternatives based on their herbal nature. © 2020, Universidade Estadual Paulista, Institute of Science and Technology of Sao Jose dos Campos. All rights reserved.
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    Article
    Light Transmission of Different Resin Composites at Different Thicknesses
    (Cumhuriyet University Faculty of Dentistry, 2016) Saridağ, S.; Çökük, N.; Kara, E.; Köseler, E.
    Objectives: The aim of this study was to evaluate the light transmission of different types and thicknesses of composites. Materials and Methods: Disk-shaped (N = 240, n = 10 per group) samples of ten direct composites (Aelite-Aesthetic -Enamel, Aelite-LS-Posterior, Aelite-All-Purpose-Body, Clearfil-Majesty-ES-2 Classic, Filtek Ultimate-Enamel, Filtek Z-250 Universal, G-ænial Anterior, Gradia Direct, IPS Empress Direct, and Tetric N-Ceram) and two indirect composites (Estenia C & B and Signum-Ceramis) with diameters of 10 mm and thicknesses of 1 and 2 mm were fabricated. The translucency of each sample was determined with a digital radiometer using the direct transmission method and a 1200 mW/cm2 LED beam as the light source. Measurements were repeated three times for each specimen, and the obtained data were analyzed using ANOVA and Duncan multiple range tests (α = 0.05). Results: The materials with the highest light transmission values included the Filtek Ultimate-Enamel (1 mm: 8.36 lux, 2 mm: 4.62 lux), Gradia Direct (1 mm: 8.57 lux, 2 mm: 4.65 lux), and Tetric N-Ceram, while those with the lowest light transmission values included the Aelite-All-Purpose-Body (1 mm: 2.89 lux, 2 mm: 1.21 lux) and Estenia C & B composites. Conclusions: The type of composite, as well as the particle size and filler content, significantly affected the light transmission characteristics.