Abstract
Objective To evaluate the color stability of a new organic rice husk nanocomposite as compared to four conventional composites after exposure to commonly consumed beverages in Malaysia. Methods One hundred and twenty-five disk samples were prepared from a new rice husk-based composite and four other conventional methacrylate-based light-cured composites of shade A2. The samples were immersed in four commonly consumed beverages: coco-based drink, kopi, Chinese tea, and teh tarik for four weeks. The color measurements were carried out every week using the reflectance spectrophotometer according to the CIE L∗a∗b∗ color system. Color changes of samples (ΔE) in each week were calculated. Statistical analysis was carried out by performing a mixed ANOVA and Tukey's post hoc test in order to analyse the differences in ΔE. Results The findings revealed a statistically significant difference of ΔE reading (p < 0.05) among all composites immersed in all four beverages after four weeks. Rice husk composites exhibited lesser color stability as compared to Ceram.X One Universal (p < 0.001) and G-aenial Universal Flo (p < 0.001) but showed higher color stability compared to Solare-X (p < 0.001) and Neofil (p < 0.001). Coffee and Chinese tea had the most significant impact on color changes (p < 0.05) observed in all composites over four weeks of study. Conclusion Rice husk composite showed acceptable color stability. It can be considered as an alternative to conventional composites due to its eco-friendly properties.
Highlights
Rice husk composites exhibited lesser color stability as compared to Ceram.X One Universal (p < 0.001) and G-aenial Universal Flo (p < 0.001) but showed higher color stability compared to Solare-X (p < 0.001) and Neofil (p < 0.001)
All specimens were not subjected to any polishing procedure to minimize the effect of polishing on stain intake by the various composite materials as we wanted to test the effect of composition on the staining ability
As for coco-based drink and distilled water, in between weeks 1 and 4, no significant difference in color changes was observed on of all composites with G-aenial Universal Flo (GUF) and Ceram.X One Universal (CXO), showing clinically perceptible ∆E across the duration of study
Summary
To evaluate the color stability of a new organic rice husk nanocomposite as compared to four conventional composites after exposure to commonly consumed beverages in Malaysia. E present study investigated the color stability of these materials and a novel rice husk composite [8], which is an organic nanocomposite that contains amorphous rice husk nanosilica. Erefore, the aim of the present study was to evaluate the color stability of rice husk-based composite and four other commercially available methacrylate-based composites after immersion in the commonly used beverages. E null hypothesis tested is as follows: (1) rice husk-based composite would not elicit better color stability compared to conventional methacrylate-based composite and (2) the types of beverages used and exposure time of immersion study would not influence the color of the rice husk composite Erefore, the aim of the present study was to evaluate the color stability of rice husk-based composite and four other commercially available methacrylate-based composites after immersion in the commonly used beverages. e null hypothesis tested is as follows: (1) rice husk-based composite would not elicit better color stability compared to conventional methacrylate-based composite and (2) the types of beverages used and exposure time of immersion study would not influence the color of the rice husk composite
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