ABSTRACT
The aim of this study was to evaluate the color stability of the bis-acryl composite resin employed for the manufacturing of the short and long-term provisional prosthesis. For this, the bis-acryl resin was polished with different particle sizes, and the disks were aged in a thermocycler for 20, 100 and 200 cycles. Other disks, polished and unpolished, were immersed in the colorants beverages (green tea, red wine and coffee with sugar) for 24 hours, one week and one month. All groups and times were measured by a spectrophotometer and with the L*a*b* coordinates, the color (ΔE00), lightness (ΔL′), chroma (ΔC′) and hue (ΔH′) differences were calculated using the CIEDE2000 formula. The results showed that the unpolished group presented the greatest color differences after 200 cycles (3.73), as well as after 1 month of immersion in red wine (8.57) and coffee (5.48) (P < 0.001). Although the polished groups presented a statistically similar behavior, these groups showed higher staining with increasing immersion time.
