###### Abstract  
The durability and patient acceptability of prosthesis can be gauged by the capacity of visible light curing lab composite resins to maintain color stability through time and use. Consequently, this study's goal was to assess the color stability of three layering materials, incisal, dentin, and gingiva of SR Nexco lab composite, with exposure to coffee, Coca-Cola, and turmeric solution using a spectrophotometer. A total of 60 specimens (10 \(\times\) 2 mm) of SR Nexco paste were prepared and were divided into three groups based on the layering material used. Five specimens of each group were immersed in staining solutions, namely, coffee, cola, and turmeric solution. Each group's last five specimens were submerged in distilled water (control). The incubator that housed the samples was set to 37 \({}^{\circ}\)C. The CIE L*a*b* method was used to quantify the color differences (E) of specimens using a spectrophotometer at baseline and after two weeks of immersion. Using ANOVA testing, the average color change for each specimen was examined. Tukey tests were used for post hoc comparisons. The calculated mean color difference (\(\Delta\)E) for incisal ranges from 3.73 (distilled water) to 28.70 (turmeric). The mean color difference (\(\Delta\)E) for dentin ranges from 2.66 (distilled water) to 41.19 (turmeric). The mean color difference (\(\Delta\)E) for gingiva ranges from 1.72 (distilled water) to 23.88 (turmeric). The results are statistically significant. The maximum color difference is noted for dentin specimens, and turmeric stains all three layering materials to a maximum. The color stability of SR Nexco paste layering materials is significantly affected by the discoloring agents used. The comparison of color change between the three layering materials of SR Nexco paste (dentin, incisal, and gingiva) is statistically not significant. Turmeric solution exhibits more discoloration followed by cola and coffee solution. composite resin; staining; prosthesis; coffee; turmeric; Coca-Cola; color stability; incubator 4.0/. +
Footnote †: journal: Applied Sciences
principles that underlie the beauty and attractiveness of an object, design, or principle [2]. For many edentulous individuals today, dental aesthetics are a top priority. Modern dental prosthesis must seem natural and be appropriate for the patient's age and lifestyle [3]. Dental prostheses and restorations manufactured with 3D technology are precisely crafted to complement the adjacent oral anatomy [4]. Two basic characteristics of a complete denture may be stated [5]:  
1. Characterization by selection, arrangement, and modification of artificial teeth;
2. Characterization by tinting the denture bases. Artificial teeth have a big role in the overall aesthetic of removable dentures [6]. Manufacturers' stock artificial teeth lack a natural aesthetic appearance because of the consistency of hue and tint that is inherent in their fabrication. Techniques for altering acrylic resin teeth have been developed that incorporate realistic denture teeth for characterization and coloring [7]. Dental experts have been able to construct restorations that are lifelike and vibrant due to advancements in dental technology, the qualities of dental materials, and a greater knowledge of the optical characteristics of real teeth [8]. Numerous prosthodontic applications, such as the replacement of missing or broken denture teeth, the construction of composite denture teeth on removable partial metal frameworks, the characterization of acrylic resin denture teeth, and the treatment of acrylic resin denture teeth wear, have made visible light-cured indirect lab composites very popular [9; 10]. In dentistry, SR Nexco paste, a more recent pure light-curing lab composite, has been created. It provides a lifelike look, layer thickness tolerance, long-lasting shade stability, long-lasting gloss, and flexibility of polymerization.