Background Dentists started to follow the era of using single shade resin composite restorations to avoid color shade selection. Our study was done to evaluate and compare color stability of two single shade resin composite materials. Methods sixty samples were randomly allocated into two main groups (n = 30) according to the composite resin used: Group O: (Omnichroma) samples and Group V: (Venus Peral) samples. Each group was then divided into two subgroups (n = 15): group O1 and V1: samples immersed in coffee. Group O2 and V2: samples immersed in distilled water. Color changes (Δ E) and roughness values (Ra) were evaluated at baseline, 1st, and 14th days of immersion. Color change was assessed using Vita Easy Shade V while surface roughness was assessed using, profilometer and Atomic Force Microscope (AFM), respectively. Data were collected and statistically analyzed using two-way variance analysis (ANOVA) and Tukeys post-hoc test (p < 0.05). Results Group O1 and V1 recorded the highest Δ E (P = 0.0002, 0.001, respectively) and Ra values (P < 0.001) no significant difference between both materials at 14 days Conclusion Single shade resin composite with smart chromatic material technology has dramatically color change and surface roughness that sacrifice esthetic success.

Aim: This in vitro study evaluated and compared the remineralizing potential of different herbal extracts aqueous solutions versus fluoride mouthwash by assessing the enamel surface microhardness and antimicrobial susceptibility. Materials and methods:Sixty extracted premolars were used in this study and equally distributed into six groups of 10 teeth each. Group A: teeth treated with 0.5% stevia aqueous solution; Group B: teeth treated 5% stevia aqueous solution; Group C: teeth treated with 0.5% green tea aqueous solution; Group D: teeth treated with 5% green tea aqueous solution; Group E: teeth treated with Fluoride mouthwash as a positive control group; negative control group: teeth not subjected to any treatment and stored in artificial saliva. The teeth of each group were subjected to microhardness assessment at baseline, after 48 hours demineralization, and after 7 days remineralization phase. The antibacterial activities of herbal extracts and fluoride against S. mutants and Lactobacillus were quantitatively measured by an antimicrobial susceptibility test.Results: After 7 days of treatment, the highest mean value was recorded in group D (282.69 Kgf/mm 2 ) with the least mean value recorded in the control group (168.66 Kgf/mm 2 ). The difference between groups was statistically significant (p= 0.001). The 5% green tea extract showed the highest mean value of inhibition zone (10.6 mm) against S. mutants' while fluoride showed the highest mean value of inhibition zone (14.6 mm) against the Lactobacillus. Conclusion:An aqueous solution of 5 % green tea is an effective remineralizing agent with antimicrobial activity against S. mutans.

Background Dentists started to follow the era of using single-shade resin composite restorations to avoid color shade selection. Our study was done to evaluate and compare the color stability of two single-shade resin composite materials. Methods Sixty samples were randomly allocated into two main groups (n = 30) according to the composite resin used: Group O: (Omnichroma) samples and Group V: (Venus Peral) samples. Each group was then divided into two subgroups (n = 15): group O1 and V1: samples immersed in coffee. Group O2 and V2: samples immersed in distilled water. Color changes (ΔE) and roughness values (Ra) were evaluated at baseline, first, and 14th days of immersion. The color change was assessed using Vita Easyshade V, while surface roughness was assessed using a profilometer and Atomic Force Microscope (AFM). Data were collected and statistically analyzed using two-way variance analysis (ANOVA) and Tukey's post-hoc test (p < 0.05). Results Group O1 and V1 recorded the highest ΔE00 (P = 0.002, 0.0001, respectively) and Ra values (P < 0.001) with no significant difference between both materials at 14 days. Conclusion Single shade resin composite with innovative chromatic material technology has dramatic color change and surface roughness that sacrifice esthetic success.