Background: Denture teeth play a critical role in overall aesthetic outcomes of removable complete dentures, and long-term maintenance of these outcomes depends on the color stability of the prosthetic teeth. The characteristics of denture base resins play a significant role in prosthetic clinical performance and aesthetics. Objectives: The purpose of this study was to assess the effect of two flasking materials on the color stability of five brands of denture teeth that were immersed in commonly consumed beverages. Materials and Methods:In the present study 560 denture teeth (20 series) were invested with heat-and cold-cured acrylic resin. All the specimens were thermo cycled between 4°C and 60°C, with 60 Seconds dwell times for 1000 cycles. Subsequently, the specimens in each group were divided into four subgroups based on the immersion medium: coffee, tea, cola, or distilled water. Digital images of the teeth were taken before immersion and 30 days after immersion. The color samples were measured using the CIE L * a * b

Aim: This study assessed the validity and reliability of color selection by smartphone photography using two smartphone applications and Adobe Photoshop software. Settings and Design: In vitro comparative study. Materials and Methods: The validity and reliability of dental tooth shade recognition (DTSR), Chromatcher, and Adobe Photoshop were evaluated for color selection of shade tabs. The iPhone 7 camera in automatic mode was used for photography. Images were captured using Smile Lite with/without polarized filter and with camera flash. To assess the reliability, nine Vita Lumin Vacuum shade tabs were chosen and each was photographed for 10 times using Smile Lite. The reliability of DTSR, Chromatcher, and Photoshop in shade-taking was calculated. To assess their validity, 16 shade tabs of Vita Lumin Vacuum and 26 shade tabs of Vita 3D Master were photographed using the aforementioned lighting conditions. The color of photographs was calibrated and shade-taking was performed and compared with the shade suggested by SpectroShade as reference. Statistical Analysis Used: Data were analyzed using Two-way analysis of variance and Bonferroni post hoc test. Results: The reliability of Photoshop, DTSR, and Chromatcher was 98.88%, 63.3%, and 100%, respectively. The validity of Photoshop was significantly higher than other software programs ( P < 0.05). Chromatcher had higher validity than DTSR ( P < 0.05). Conclusion: Shade-taking by calibrated smartphone pictures and Adobe Photoshop has high validity and reliability.