Comparative Evaluation of the Staining Resistance of Two Single-Shade Composites in Coffee and Chlorhexidine: A Spectrophotometric Analysis.

Introduction: Color stability is a critical factor for the longevity of composite restorations, especially in esthetic dentistry. Single-shade universal composites have been designed to blend seamlessly with natural tooth structures. This study aimed to compare the staining resistance of Omnichroma (Tokuyama Dental, Tokyo, Japan) and Vittra Unique (FGM Dental Group, Joinville, Santa Catarina, Brazil) over a 30-day period using spectrophotometric analysis to assess color changes.