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    Gastric acid challenge: Mechanical proficiency and surface gloss of tooth-colored restorative materials
    (Bmc, 2025) Yenidünya, Özge Gizem; Misilli, Tuğba; Yılmaz, Ebru
    BackgroundTo evaluate surface microhardness, roughness, and gloss changes of tooth-colored restorative materials [a direct composite (G-aenial A'Chord), an indirect composite (Gradia Plus), an ormocer (Admira Fusion), a giomer (Beautifil II), and an alkasite (Cention N)] after exposure to simulated gastric acid.MethodsA total of 110 disc-shaped specimens (22 discs of each material) were prepared using silicone molds (8 mmx2 mm) and exposed to either gastric acid or artificial saliva (control). Surface roughness (Ra), gloss (GU), and microhardness (VHN) were measured at baseline and after 96-hour of immersion in the solutions and the respective changes (triangle Ra, triangle GU, triangle VHN) were calculated. Intergroup comparisons were performed using ANOVA (Tukey post hoc) or Kruskal-Wallis tests (Bonferroni correction). Independent samples t-test or Mann-Whitney U test was used for comparisons of each material across immersion media, while paired t-test was applied for time-dependent analyses.ResultsIn the gastric acid medium, changes in all parameters led to significant differences among restorative materials, while in the artificial saliva medium, significant differences were observed in triangle VHN and triangle GU. The statistically significant difference between immersion media was observed in both triangle VHN and triangle Ra values for the giomer group, and in only triangle VHN values for the alkasite and indirect composite groups. In the gastric acid medium, the decrease in VHN and GU values was significant across all subgroups, while the increase in Ra was statistically significant only in the giomer and alkasite groups.ConclusionsWhile the giomer group exhibited the most significant changes in roughness and microhardness following exposure to gastric acid, all tested materials executed clinically admissible results regarding surface gloss.Clinical trial numberNot applicable.
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    Öğe
    Micro-coMputed toMographic assessMent of the influence of light-curing Modes on internal void forMation in bulk-fill coMposites
    (Termedia Publishing House Ltd., 2024) Yenidünya, Özge Gizem; Misilli, Tuğba; Ocak, Mert
    Introduction: Polymerization reactions in a new generation bulk-fill composites carried out in a short time with high irradiation, raise concerns about curing processes. With micro-computed tomographic evaluation, it is possible to investigate polymerization shrinkage, and subsequent gap and void formation in dental materials. Objectives: The aim of this study was to evaluate the void formation in bulk-fill composites light-cured with different modes using micro-computed tomography. Material and methods: Class I preparations were made in 25 molars that were randomly divided into subgroups, according to resin composite and curing mode used: Tetric EvoCeram (TEC)*high power mode, TEC*turbo mode, Tetric PowerFill (TPF)*high power mode, TPF*turbo mode, and TPF*3s mode. Each tooth was scanned at two time intervals: pre- and post-cure. Results: After light-curing, a significant increase in the total volume of internal void was noted for both composites cured with high power mode compared with pre-cure. The difference between the sub-groups at post-cure was also significant. While TEC exhibited similar values in terms of different curing modes, turbo and 3s modes caused a significant difference in TPF group, and the lowest void percentage was detected in 3s mode. Conclusions: Internal void formation results from an interplay of different factors, including composition of materials and curing modes. © 2024 Polish Dental Association.