## 4 Discussion
In this study, coffee appears to have an extreme influence on the CF (coffee) change in comparison to the denture cleaner STD (Steradent)/CF. TiO2-reinforced PMMA in coffee showed the lowest color stability, while the E-glass-fiber-reinforced PMMA in STD/CF showed the highest color stability [36]. [PERSON] (2022) compared the color stability and surface roughness of conventional and self-blending resin composites before and after staining and aging. Composites used in the study were three conventional composites (Filtek Z350, IPS Empress Direct, and Etalite Palfique LX5) and one self-bending composites (Omnichroma). All groups showed significant decrease in all color parameters (L*a*, and b*), and after polishing, all groups showed enhancement in color, thus, matching pre-experiment baseline colors [37]. [PERSON] (2021) comparatively evaluated the effect of three different beverages (Dasamoolaristam(an ayurvedic medicine), tea, grape juice, and distilled water) on color stability of two brands of acrylic denture teeth (Acryrock and Rolex) exposed to four immersion times. A1 shade maxillary right central incisors of two brands were used. The study showed maximum color change on exposure to Dasamoolaristam for the Rolex teeth set. The highest color mean difference was obtained in the Dasamoolaristam on day 30 of measurement of the Rolex teeth set [38]. [PERSON] (2022) observed the color change of cold beverages consumed on resin containing restorative materials. There was no statistically significant difference in color changes of the resin containing dental materials at the end of the 1 st day (\(p>0.05\)) but, at the end of the 7 th and 30 th day, cold tea caused statistically higher color change (\(p<0.05\)). Composite resins showed more color change than resin-based CAD/CAM blocks [39]. [PERSON] (2021) evaluated and compared the color stability of 3D-printed and conventional heat-polymerized acrylic resins following aging, mechanical brushing, and immersion in staining medium. The autonomous factors, namely, material, staining medium, and immersion time, and interaction between these factors significantly influenced \(\Delta\)E (\(p<0.001\)). Irrespective of the materials, treatments, and time, the highest and the lowest mean \(\Delta\)Es were observed for poly methyl methacrylate (PMMA) in lemon juice and DB (3D-printed DentaBASE) in artificial saliva [40]. Evaluating long-term consequences of aging and staining are required with the introduction of the newer composite SR Nexco paste (Ivoclar). There is no evidence in the literature about the color stability of layering materials (incisal, dentine, and gingiva) of this newer composite. Knowing the color stability of SR Nexco paste indirect composite helps us to know the durability and acceptability of artificial teeth on which the composite is used to layer the acrylic teeth. The main application of this novel method helps the clinician to evaluate the color stability of different layering materials of laboratory-processed composite resin that is used for characterizing acrylic denture teeth. This latter method, using indirect composite materials, produces a more lifelike appearance in acrylic teeth over the denture base in defendulous patients. The hypothesis of this study was rejected, as all the staining agents used, along with distilled water, caused statistically significant color change of the SR Nexco indirect composite. Limitations of the study: The acrylic teeth that must be characterized in clinical settings have an uneven form with convex and concave surfaces, making effective polishing and plaque management more difficult to achieve than the experimental specimens, which are flat. The use of a single measurement for each specimen under the test conditions might have influenced the results. The study's findings might have been impacted by the smaller sample size of the composite resin specimens employed in the investigation.