Evaluation of the Color Stability and Surface Roughness of a Novel Single-Shade Composite Resin: A Smart Chromatic Technology

Abstract

BACKGROUND/AIMS: This study aimed to assess the color stability and surface roughness of a newly developed single -shade resin -based composite (RBC) utilizing smart chromatic technology in comparison to nanohybrid and nanoceramic RBCs. MATERIALS AND METHODS: A total of 120 specimens of RBC discs were prepared on a round metal mold (diameter 6 mm, thickness 2 mm). Distilled water was used as a control. Three different RBCs; harmonize (n=40), omnichroma (OM) (n=40), and zenit (n=40), were immersed into three staining beverages, namely orange juice, cola, and coffee, respectively, as the test groups. Prior to the immersion, the initial roughness and color values were recorded using a profilometer and CIE L* a* b*, respectively. The color changes and surface roughness values were determined again after one week. The normality test of numerical variables were analysed by means of Kolmogorov-Smirnov and Shapiro -Wilk tests (p <= 0.05). RESULTS: There was no significant difference between the initial surface roughness values (Ra) among the groups. However, a significant increase was observed in the roughness values of harmonize immersed in coffee (p=0.024) and OM immersed in cola (p=0.021). The color stability of RBC was significantly affected by the immersion period, and coffee caused the highest discoloration (p<0.001). CONCLUSION: The new generation monochrome smart composite resin with spherical filler (OM) is clinically recommended as it shows acceptable values in terms of color stability and roughness. Therefore, OM may be preferred as an alternative to multi -shade composites as it simplifies color selection.