Aim: The purpose of this in vitro study was to evaluate the effect of the Equia Forte Coat on the color stability of Equia Forte Fil.
Materials and methods: Sixty discs of Equia Forte Fil were randomly divided into two groups. One group of 30 samples was treated with Equia Forte Coat according to the manufacturer's directions. The other 30 discs were not coated. All discs were continuously soaked in cola for 7 consecutive days. The color changes in the Equia Forte Fil samples were determined using a colorimeter. The color difference (△E) was calculated using the Commission Internationale de l'Eclairage L*a*b* coordinates.
Results: There was a significant difference in ΔE between the two groups (P < 0.0001). The group with Equia Forte Coat had significantly less color change than the group without the Equia Forte Coat.
Conclusion: The application of the Equia Forte Coat significantly improved the color stability of Equia Forte Fil.
Keywords: Colorimetry; resin coat; resin-modified glass ionomer.