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    Evaluation of fracture resistance and crack propensity of bulk-fill composite restorations reinforced by polyethylene fiber
    (Bmc, 2025) Senol, Ayse Asli; Manav, Aybike; Dogu Kaya, Bengu; Yilmaz Atali, Pinar; Kahramanoglu, Erkut; Tarcin, Bilge; Turkmen, Cafer
    Background In clinical restorative applications, different materials and techniques are used to replace lost tooth tissue and compensate for the fracture resistance that are essential for function. Further investigation is required to ascertain the effect of polyethylene fiber application, which is one of these interventions, on the fracture resistance, fracture location, reparability and crack propagation of premolar teeth restored with direct composite resin restorations. This in-vitro study aimed to evaluate fracture resistance and crack propagation of two bulk-fill composites (BRC) with/without polyethylene-fiber in extensive Class I resin composite restorations. Methods Cavities were prepared on 40 mandibular premolars. In half of the samples (n = 20), polyethylene-fiber (Ribbond Fiber/RF) coated with adhesive resin was placed on cavity floor. Half of the teeth were restored with SonicFill 3 and the other half with Charisma Bulk Flow ONE.The groups were as follows: SonicFill 3 + Fiber(SF + RF), SonicFill 3(SF), Charisma Bulk Flow ONE + Fiber(CO + RF), and Charisma Bulk Flow ONE(CO). Following 20,000 thermo-cycles fracture resistance (FR) was determined. Crack number/orientation were assessed with transillumination using two different wavelengths, before (t(0)) and after preparation (t(p)), and following fracture test (t(f)).Visual examination was performed with micro-CTto evaluate the adaptation. Data were analyzed using Independent samplesT-test, Fisher's Exact, Fisher Freeman Halton, Pearson Chi-Square and Cochran's QTests (P < .05). Results No statistically significant difference was found between the FR of groups (P = .994) with and without RF (P = .167) according to BRC. The mean FR values in decreasing order were CO (761.09 +/- 224.32) > SF + RF (671.08 +/- 150.51) > CO + RF (669.95 +/- 358.44) > SF (580.7 +/- 269.04). A reduction in the formation of irreparable fracture patterns was detected in RF groups. Crack number/orientation did not differ according to BRC and RF application. Statistically significant increase was observed in crack formation over examination periods (t(f)> t(p)> t(0); P < .001). Conclusions The reinforcement of large cavities with polyethylene fibers changed the fracture pattern of the restorations towards repairable, whereas had no effect on fracture resistance and crack formation. Furthermore, the placement of polyethylene fibers may have an adverse effect on the adaptation of the cavity. In clinical applications, both wavelengths can be used for transillumination testing in crack inspection.
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    Öğe
    Influence of modeling liquids on the color adaptation and optical properties of single and simply shade resin composites
    (Springer, 2025) Dogu Kaya, Bengu; Buldur, Mehmet; Gozetici-Cil, Burcu
    Objectives This study evaluated the effect of different interlayer modeling liquids on the color adaptation and translucency of single- and simply-shade resin composites using spectrophotometric analysis. Materials and methods Four resin composites were evaluated: Herculite Classic Dentin (A2), Omnichroma, Essentia Universal, and Optishade Medium. A 2-mm base layer of Herculite Classic Dentin was used in all specimens, followed by two 1-mm layers of either the same or one of the other composites. GC Modeling Liquid and Bisco Modeling Resin were applied between increments, while no-liquid specimens served as controls. A total of 144 multilayered disc specimens were fabricated and polished under standardized conditions. Color measurements (L*, a*, b*, C*) were obtained with a spectrophotometer on gray, black, and white backgrounds. Color difference (Delta E-0(0)) and translucency parameter (TP) were calculated. Statistical analyses were performed using ANOVA with a significance level of p < 0.05. Results Both composite type and modeling liquid significantly influenced optical outcomes (p < 0.001). In Omnichroma, Delta E-0(0) values were higher with Bisco Modeling Resin compared with GC Modeling Liquid, indicating greater color change. Translucency analysis showed that Bisco Modeling Resin reduced TP values in Essentia Universal, Optishade Medium, and Herculite but increased TP in Omnichroma. GC Modeling Liquid caused decreased TP only in Essentia Universal. Across all conditions, Omnichroma displayed the highest translucency, while Herculite and Optishade Medium demonstrated lower values. Conclusion The optical properties of resin composites may be influenced by the composition of modeling liquids, with pigment-free single-shade materials showing greater susceptibility to such effects.