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    Evaluation of color stability after the application of a bleaching agent to different composite resins
    (2022) Köse, Hazal Deniz; Güner, Zehra Şivgan
    Aim: In dentistry, it is desirable to preserve the properties of composites for a long time. With the development of technologies, the number of different composites used in dental treatment has increased. With contemporary patients’ aesthetic expectations, bleaching treatmens are often sought, and the literature contains many studies on the effects of bleaching on composites. Our study aimed to examine the color stability of different types of composites immersed in different solutions after bleaching treatment. Methodology: A total of 72 samples (n = 8) of three composite materials were examined: Omnichroma (Tokuyama Dental Co., Tokyo, Japan), Estelite Posterior (Tokuyama Dental Co., Tokyo, Japan), and Quadrant (Cavex, Holland BV, Netherlands). All specimens were subjected to Total Blanc (Nova DFL, Rio de Janeiro, Brazil), which is an office-type bleaching agent. After bleaching treatments, the specimens were immersed in distilled water. The baseline measurements were then recorded. After being immersed in distilled water, tea, or coffee for seven days, the final color measurements were recorded. A VITA Easy Shade device (Vita Zahnarzt, Bad Säckingen, Germany) was used to take color measurements. The CIEDE2000 formula was used to calcuate ?E00 values. The Kruskal– Wallis test was used to compare the ?E00 values obtained from the composite samples to assess color stability. The results were rated at a significance level of p < 0.05. Results: After bleaching treatments, the interaction between the different composites and the solutions in which they were immersed had a statistically significant effect on ?E00 values (p < 0.05). The highest mean value was obtained with the quadrant composite material that was immersed in the coffee solution. Conclusion: It is clear that tea and coffee cause discoloration in dental composites after bleaching treatments. Due to the sorption of these solutions into the composite structure, dentists should warn patients to be cautious about consuming beverages after bleaching.
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    Evaluation of liquid sorption and color stability of dental composites after exposure to common lactation teas
    (2021) Bilmez, Zuhal Yıldırım; Şeker, Oya; Köse, Hazal Deniz; Aslan, Başak Gözüyeşil
    Aim: To assess the effects of common lactation teas on liquid sorption and\rcolor stability of three different dental composites.\rMethodology: A total of 60 samples (n = 5) were examined from three\rcomposite materials: Omnichroma (Tokuyama Dental Co., Tokyo, Japan),\rEstelite Posterior, (Tokuyama Dental Co., Tokyo, Japan), and Mosaic\rUniversal (Ultradent production Inc., South Jordan, UT, USA). Samples\rmeasuring 2x6 mm were taken and immersed in three different teas—\rHumana (Humana, Bremen, Germany), Hipp, (Hipp, Pfaffenhofen,\rGermany), and Lactamil (Nutricia, Friedrichsdorf, Germany) —as well as\rartificial saliva. The measurements were recorded at baseline and on the\r7th day. A sensitive analytical balance was used to measure liquid sorption,\rand a VITA Easy Shade device was used for color measurements. Absorption\rand Delta E values were calculated. The data were analyzed using MANOVA\rat a significance level of (p<0.05).\rResults: Composite materials, solutions, and their interactions had a\rstatistically significant effect on the sorption and Delta E values (p<0.001).\rThe relative liquid absorption values among the composites were recorded\ras follows: Tokuyama>Mosaic>Omnichroma. Humana had the highest and\rHipp had the lowest mean value among the solutions (p<0.001). For Delta\rE, Mosaic had the highest mean value among the composites, and Lactamil\rhad the highest mean value among the solutions (p<0.001).\rConclusion: Lactation teas cause discoloration in dental composites. In\rvitro and in vivo studies on color changes in dental composites are needed\rdue to the sorption of these fluids.