Evaluation of the color-matching potentials of different universal composite resins with natural tooth structure in class III through-and-through cavities using a visual guide and spectrophotometer.

Background: This study assessed the color-matching potentials of Omnichroma single-shade composite resin and Omnichroma Blocker with natural tooth structure in Class III through-and-through restorations and compared them with a universal multi-shade composite resin using both visual and spectrophotometric evaluations. Methods: Class III through-and-through cavities were prepared on the mesial and distal aspects of 32 extracted anterior teeth. Each preparation was restored with either Omnichroma composite resin or Tetric Evoceram composite resin, with or without an 0.5-mm depth of Omnichroma Blocker on the lingual aspect. Color measurements were performed initially and after restoration using visual evaluation with the VITA Classical Shade Guide and the SpectroShade microspectrophotometer. Color differences were calculated using the CIEDE2000 formula. Results: Tetric Evoceram with and without blocker exhibited a statistically significant difference in color match with natural tooth structure ( Conclusion: Failing to use a blocker with Tetric Evoceram composite resin in large Class III cavities reduced color matching. In contrast, using a blocker with Omnichroma composite resin did not affect the final color-matching ability. Furthermore, the Omnichroma composite resin demonstrated better visual color matching, regardless of the presence of a blocker, than the Tetric Evoceram composite resin.