Browsing by Author "Yuksek, Merve Aksoy"

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Influence of Cusp Reduction and Fiber Reinforcement on Cusp Deflection and Fracture Strength of Restored Endodontically Treated Molar Teeth
(Springer Heidelberg, 2025) Yuksek, Merve Aksoy; Alp, Cemile Kedici; Sari, Ceyda; Bala, Oya
Objective This study aimed to investigate the influence of various cusp reduction amounts, localization, and the use of coronal polyethylene fiber on cusp deflection in endodontically treated molar teeth. Material and methods The 120 intact molar teeth observed in the study were divided into 12 groups, and standard MOD cavities were prepared after the root canal treatment was completed. Groups 1 and 2 were determined as positive and negative control groups, respectively. Two cusp reductions were applied to Groups 3, 4, 5, and 6, and functional cusps reduction were applied to Groups 7, 8, 9, and 10. The cusp reductions were either 1.5 mm or 3 mm. After preparation, Groups 3, 5, 7, 9, and 11 were restored with Filtek One Bulk-Fill, while Groups 4, 6, 8, 10, and 12 were restored with Filtek One Bulk-Fill + Ribbond. As the teeth were restored, the amount of cusp deflection was measured with a twin channel deflection gauge device. The fracture strength of the teeth was measured using a universal test machine. The experimental results were statistically evaluated with two-way and one-way ANOVA tests. Results The reinforcement of the coronal structure with fiber reduced cusp deflection and increased fracture strength. The statistically significantly less cusp deflection was obtained in the groups with the same cavity design of having fiber placed than in the groups without fiber placed (p < 0.001). The statistically significantly lower fracture strength was obtained in Group 11 than all the reduced groups except Groups 5 and 7 (p < 0.05). The statistically lower fracture strength was obtained in Group 12, than in Group 4 (p < 0.05). Experimental groups with cusp reduction showed less cusp deflection (p < 0.001) and higher fracture strength (p < 0.05) than experimental groups without cusp reduction. Conclusions Fiber application and cusp reduction may have positive effects in terms of reducing cusp deflection and increasing fracture strength in direct restoration cases involving excessive substance loss in endodontically treated teeth. Clinical relevanceIncorporating cusp reduction and coronal fiber applications in treatment plans for endodontically treated teeth ensures that restorations are both functional and durable.
The Influence of Modeling Liquid on Microhardness of Single-Shade Composite Resins: an In-Vitro Study
(Wolters Kluwer Medknow Publications, 2024) Dincturk, Beyza Arslandas; Yuksek, Merve Aksoy; Alp, Cemile Kedici
Aim: To assess the effect of modeling liquid on the microhardness of single-shade universal composites. Materials and Methods: A total of 60 disk-shaped samples were prepared in six groups [Omnichroma (OM), Essentia Universal (EU), Vittra APS Unique (VA), OM + Signum, EU + Signum, and VA + Signum] for surface microhardness measurements. Samples were stored in a coffee solution for 7 days and after that bleached with an Office bleaching agent (Total Blanc Office). Surface microhardness was measured for baseline, after staining, and after bleaching. A two-way analysis of variance test was used for statistical analysis (P < 0.05). Results: In terms of microhardness, there is a statistically significant difference (P < 0.05) between the two categories with and without modeling liquid. The alterations in microhardness measurements at baseline, after staining, and after bleaching are statistically significant (P < 0.05). The Essentia groups showed the lowest microhardness findings at all measurement times. Microhardness values decreased significantly more when EU was applied along with modeling liquid than when it was not applied at different intervals. Conclusions: Modeling liquid affects the microhardness of single-shade composites. Microhardness is reduced when modeling liquid is used for all three single-shade universal composite resins at three different times.