Chameleon effect of nano-filled composite resin restorations in artificial acrylic teeth of various shades

Composite resins are tooth-colored restorative materials commonly used for esthetic purposes. These resins sometimes exhibit a chameleon effect, defined as their ability to adjust their color to suit that of their surroundings. This is typically marked by a shift in the shade of the composite resin. The aim of this study was to demonstrate the chameleon effect of nano-filled composite resins. This laboratory-based experimental study included one control group, which consisted of isolated composite resins filled into a mold, and four treatment groups consisting of composite resins filled in artificial acrylic teeth of varying shades. The color test was carried out based on the spectrophotometer principle using vita easy shade on days 0, 1, and 7 of restoration and immersion in distilled water. The bivariate analysis showed that the nano-filled composite resins in the test groups exhibited a shift in color.