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    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.
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    Öğe
    Periodontal status of indirect resin composite restorations with proximal box elevation: 3-year clinical results
    (Springer Heidelberg, 2025) Aksaka, Nurcan; Gozetici-Cil, Burcu; Ozcan, Mutlu
    Objectives This prospective controlled clinical trial aimed to evaluate the periodontal status of posterior indirect resin composite (IRC) restorations followed by proximal box elevation (PBE), based on clinical and radiographic parameters. Additionally, the study investigated the influence of restoration depth and supracrestal tissue attachment (STA) violation on periodontal outcomes. Materials and methods A total of 80 molars with deep cervical margins were restored using IRC (SR Nexco) with PBE (Tetric-N Flow and Tetric-N Ceram). Of these, 42 restorations with PBE on one proximal surface (mesial or distal) in 39 patients were included. The test group consisted of the proximal surfaces restored with PBE due to subgingival margin placement, whereas the control group comprised the opposite proximal surfaces of the same teeth without restoration. Periodontal parameters including plaque index (PI), gingival index (GI), probing pocket depth (PPD), and bleeding on probing (BoP) were assessed at baseline (15 days after cementation), and at 6, 12, 24, and 36 months. Standardized periapical radiographs were used to monitor alveolar bone levels at designated follow-ups. Test and control sides were compared using the Robust Mixed ANOVA test (PI, GI, PPD) and McNemar's test (BoP). Results Data were available from 42, 39, 33, and 30 teeth at baseline, 6, 12, 24, and 36 months. No significant differences were found at any time point (p > 0.05) for none of the periodontal parameters. PPD values showed a significant change over time (p = 0.001), with pairwise differences observed between baseline and 12-, 24-, and 36-month measurements, as well as between 6- and 36-month, 12- and 36-month, and 24- and 36-month time points. Within the test group, no significant differences in BoP were found among STA grades (p > 0.05). Conclusions PBE appears to be biologically safe and clinically acceptable, even when the restorative margin is located close to or slightly within the STA, without leading to severe periodontal response resulting in alveolar bone resorption.