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    Color Stability of CAD/CAM Fabricated Inlays after Accelerated Artificial Aging
    (WILEY, 2016) Karaokutan, Isil; Yilmaz Savas, Tuba; Aykent, Filiz; Ozdere, Eda
    PurposeTo investigate the influence of accelerated artificial aging on the color stability of three different inlay restorations produced with a CAD/CAM system. Materials and MethodsThirty non-carious human mandibular molar teeth were used. The teeth were embedded in autopolymerizing acrylic resin blocks. Standard Class I inlay cavities were prepared, and the teeth were randomly divided into three groups (n = 10) to fabricate inlay restorations: (1) a feldspathic-ceramic group, (2) a resin nano-ceramic group, and (3) a leucite glass-ceramic group. Optical impressions were made with CEREC software, and the restorations were designed and then milled. The inlays were adhesively cemented with a dual-polymerizing resin cement and left in distilled water at room temperature for 1 week. Color measurements were performed with a spectrophotometer before and after accelerated aging in a weathering machine with a total energy of 150 kJ/m(2). Changes in color (E, L, a, b, C) were determined using the CIE L*a*b* system. The results were assessed using a one-way ANOVA and Tukey's HSD test (p = 0.05). ResultsThe color changes of the materials ranged from 2.1 to 9.29. The highest color change was seen in the resin nano-ceramic material. This change was not clinically acceptable (E > 5.5). No significant differences were found in the L and a values of the test groups. ConclusionsColor changes were observed in each evaluated material after accelerated aging. All CAD/CAM inlays became darker in appearance, more saturated, a little reddish, and more yellow.
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    Effect of Veneering Techniques on Shear and Microtensile Bond Strengths of Zirconia-Based All-Ceramic Systems
    (QUINTESSENCE PUBLISHING CO INC, 2017) Yilmaz Savas, Tuba; Aykent, Filiz
    Purpose: To evaluate shear (SBS) and microtensile (mu TBS) bond strengths of zirconia cores veneered using different fabrication techniques. Materials and Methods: Seventy-five IPS e.max ZirCAD plates were fabricated and divided into three groups according to the following veneering techniques: layering, pressing, and CAD-on. The specimens of the layering group were veneered with IPS e.max Ceram, and the specimens of the pressing group were veneered with IPS e. max Zir-Press. Veneering ceramics in the CAD-on group were milled from IPS e.max CAD, fused with the core by using a glass-fusion ceramic, and then crystallized. Bond strength tests were performed using a universal testing machine at a crosshead speed of 0.5 mm/min for the SBS test and 1 mm/min for the mu TBS test. Mean SBS and mu TBS (MPa) were analyzed with one-way ANOVA and Tukey's HSD test (p < 0.05). Results: Significant differences in SBS were observed between the groups (p < 0.05). The mean SBS for the CAD-on group was significantly higher (31.89 +/- 5.83 MPa) than those of the layering (14.27 +/- 4.45 MPa) and pressing (12.23 +/- 3.04 MPa) groups. However, the mean mu TBS of the CAD-on (30.41 +/- 8.64 MPa), layering (21.71 +/- 3.40 MPa) and pressing (20.74 +/- 6.36 MPa) groups were not statistically significant (p > 0.05). Conclusion: The CAD-on technique showed the highest shear bond strengths of the tested groups, and most of the specimens failed cohesively instead of failing at the adhesive interface.