Purpose: To determine the instrumental color adjustment potential (CAP-I) of 3 universal composites at 2 time intervals and 2 depths. Methods: Omnichroma, Estelite Sigma Quick, and Filtek Universal Restorative were tested. Two types of specimens were prepared. For dual specimens, Class V restorations were created in anterior denture teeth and restored with resin composites. For single specimens, replications were fabricated with resin composites (n = 10). Unrestored teeth were used for comparison. Color was measured with a spectrophotometer at 24 h and 1 month, and CAP-I was calculated. Data were compared by analysis of variance followed by the Student t-test and paired sample t-test. Results:The CAP-I of tested materials ranged from 0.11 to 0.27 at 24 h and from 0.60 to 0.76 at 1 month. At 24 h, Omnichroma yielded the highest values, followed by Estelite Sigma Quick and Filtek Universal Restorative (P < 0.05). CAP-I was significantly higher at 1 month than at 24 h in all groups. In all groups, restorations with a depth of 3.0 mm yielded better results than restorations with a depth of 2.0 mm (P < 0.05). Conclusion: Storage time and restoration depth were positively associated with CAP-I. Single-shade and multi-shade universal composites are good alternatives for color-matched, esthetically satisfying restorations.

The aim of this study is to compare surface roughness and microhardness changes of three monochromatic (Omnichroma, Vittra Unique, and Charisma Diamond One) and three universal shade (Neo Spectra ST, G-ænial A’CHORD, and Nova Compo C) resin composites after exposure to simulated gastric acid. A total of 144 disc-shaped specimens (24 discs of each composite resin) were prepared using plexiglass molds ( R = 5   mm × h = 2   mm ) for evaluation from each material. Specimens of each material were divided into two main groups for the evaluation of the microhardness and surface roughness and also two subgroups for 7- and 14-day exposures to simulated gastric acid. Initial microhardness and surface roughness measurements of all samples were measured before immersion (T1) followed by exposing the samples to simulated gastric acid for 7 days (T2) and 14 days (T3), and then, the microhardness and roughness measurements were repeated. Randomly selected specimens of each material for each of the time intervals (T1, T2, and T3) were evaluated with scanning electron microscopy (SEM). One-way ANOVA revealed that the surface roughness and hardness values of all tested composite resin restorative materials show no statistically significant difference for the initial (T1) value ( p > 0.05 ). Regarding the 7th day (T2) and 14th day (T3) surface roughness and microhardness value of all composites, there are statistically significant differences between the groups ( p < 0.05 ), while there was no statistically significant difference between the surface hardness reduction percentage between the time intervals ( p > 0.05 ). As a result of this in vitro study, increase in surface roughness and decrease in microhardness of the tested universal composite materials when exposed to simulated gastric acid were statistically significant.

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Aim: The aim of this in vitro study was to evaluate the color changes of three different universal resin composites after immersion in distilled water for one month. Materials and Methods: Omnichroma, Estelite Σ Quick, and Filtek Universal Restorative were investigated. Ten disk shaped specimens (6 mm diameter, 2 mm thickness) were prepared according to the manufacturers’ instructions for each material. After polishing, initial color measurements were taken followed by individual storage of the specimens in distilled water at 37 °C for one month when color measurements were repeated. The change in the color of each resin composites (Δ E00) was calculated with a digital method, using the CIEDE2000 color difference formula. The data were analyzed using one-way ANOVA followed by Tukey post-hoc test ( P < .05). Results: All resin composites exhibited acceptable color change after one month. Omnichroma exhibited the highest color change (2.26 ± 0.48) value while Filtek Universal Restorative showed the lowest (1.14 ± 0.38) value. All color parameters influenced the Δ E00 values in all groups except Filtek Universal for Δ L* and Δ b values. Conclusion: When performing composite resin restorations, especially for esthetic purposes, polymerization may lead to change in the color of restorative material over time, but it should be considered whether this is within acceptable limits.

Amaç: Bu çalışmanın amacı, üniversal rezin kompozitlerin renk stabilitesi ve yüzey özellikleri üzerine yaygın kullanılan içeceklerin etkilerini in vitro olarak incelemektir. Gereç ve Yöntemler: Üç üniversal rezin kompozit (Omnichroa, Estelite Sigma Quick, Filtek Universal Restorative) ve 3 farklı içecek (kahve, portakal suyu ve kola) incelenmiştir. Distile su kontrol grubunda kullanıldı. Yüzey pürüzlülüğü ve renk stabilitesi değerlendirilmesi için her materyalden her içecek için disk şeklinde örnekler hazırlandı (n=10). Ölçümler polimerizasyondan 24 saat sonra ve içeceklerde bekletme işlem sorasında tekrarlandı. Ayrıca, su emilimi için ISO 4049:2009 standartları doğrultusunda her materyalden 10 tane örnek hazırlandı. Elde edilen veriler istatistiksel olarak tek yönlü varyans analizi, post hoc Tukey testi kullanılarak analiz edildi (p&lt;0.05). Bulgular: Distile su grupları tüm materyallerde en az ΔE00 değerlerini gösterdi. Her materyalde kahvede bekletme sonrası istatististiksel olarak anlamlı bir renk değişimi tespit edildi (p&lt;0.05). İçeceklerin restoratif materyallerin pürüzlülük değerlerinde anlamlı farklılığa yol açmadığı görüldü. Omnichroma’nın tüm içeceklerde diğer restoratif materyallere göre anlamlı derecede yüksek pürüzlülük gösterdiği saptandı (p&lt;0.05). Sonuç: Renklenme estetik restorasyonda önemli bir parametredir. Estetik restoratif materyallerin hem yüzey hem renk özellikleri dış kaynaklı renklendiricilerden etkilenmektedir. Bundan dolayı, hekimler estetik restoratif materyalleri kullandıkları tedavi yaklaşımlarında bu konun bilincinde olmalı ve hastalarını bilgilendirmelidirler.