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    Addition of antibacterial agent effect on color stability of composites after immersion of different beverages
    (Wiley, 2019) Tuncdemir, Makbule T.; Gulbahce, Nilgun
    Objective The aim of this study was to evaluate the effect of the addition of antibacterial agents to composites on color changes after immersion of these composites in different beverages. Materials and Methods Composite resins containing antibacterial agents (bioactive glass [BAG] and nano-zinc silicium [NZS]) and a control group (no agent) were produced. The treatment groups were as follows: control, BAG, NZS, and BAG + NZS. Forty-eight disc-shaped specimens (8 mm in diameter and 2-mm thick) were prepared, with 12 specimens in each group. Color measurements were measured before and after immersion of the specimens in staining solutions (tea, coffee, and water) for 1, 7, and 30 days. The color measurements were repeated, and changes were calculated using the CIEDE2000 (Delta E-00) formula. Results Color differences were analyzed using a two-way analysis of variance and Tukey's tests. Significant differences were observed among the composite groups and solutions after all days in all the groups (P < .05). Conclusions The addition of the antibacterial agents did not reduce color changes. Color changes of the specimens immersed in coffee were greater than those of the specimens immersed in the other beverages, with the highest color change observed in the BAG groups. Clinical Significance The results provide information on the color stability of composite resins containing BAG and NZS and the staining potential of drinks commonly consumed in daily life. In terms of esthetic dentistry, BAG and NZS containing composites should be used in the posterior region, where there is a high risk of caries due to coloration.
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    Comparison of color stability of two laminate veneers cemented to tooth surfaces with and without preparation
    (Wiley, 2020) Tuncdemir, Makbule T.; Gulbahce, Nilgun; Aykent, Filiz
    Objective The aim of this study was to determine the effects of preparation vs nonpreparation of tooth surfaces and the types of porcelain laminate veneers (PLVs) on color changes after 300 hours of artificially accelerated aging (AAA). Materials and methods Forty extracted maxillary central incisors were used. The teeth were divided into four groups (n = 10) to evaluate preparation methods and porcelain types: Group A: tooth preparation with IPS e.max computer-assisted design (CAD), group B: tooth preparation with IPS e.max press, group C: nonpreparation with IPS e.max CAD, and group D: nonpreparation with IPS e.max press. Veneers were fabricated and cemented using a dual-polimerized cement. Initial color measurement was performed and repeated after AAA. Color changes were calculated with the CIEDE 2000 (Delta E-00) formula. Color differences were analyzed with two-way ANOVA (P < .05). Results The two-way ANOVA test showed no significant difference among the groups (P > .05). The highest color change value was observed in group C, followed by groups B, A, and D. Conclusion Preparation of veneers caused more color changes in PLVs than nonpreparation. However, IPS e.max CAD systems for fabrication of nonprepared PLVs increased the color change of the PLVs measured after AAA. Clinical Significance The results provide information on the effect of the amount of preparation and the type of porcelain on color change in porcelain laminate veneers. In terms of esthetic dentistry, IPS e.max press and non-prep treatment should be used in the anterior region, where esthetics are important.