Color Match of Single-Shade and Group-Shade Resin Composites: A Visual and Instrumental Analysis

Area of Science:

• Dental Materials Science
• Esthetic Dentistry
• Color Science in Restorations

Background:

• Single-shade resin composites aim to simplify dental procedures and improve esthetics.
• Limited clinical evidence exists regarding the color-matching capabilities of single-shade materials.
• Evaluating color match is crucial for predictable esthetic outcomes in dental restorations.

Purpose of the Study:

• To compare the color match of single-shade versus group-shade resin composites in a laboratory setting.
• To assess color differences using instrumental, visual, and computer vision analyses.
• To determine the esthetic predictability of simplified versus conventional resin composite systems.

Main Methods:

• Sixty human molars were categorized into light, medium, and dark shade subgroups.
• Standardized class V cavities were prepared and restored with either single-shade or group-shade resin composites.
• Color match was evaluated using spectrophotometry (ΔE00), visual analysis, and a computer vision algorithm (CVA) at multiple time points.

Main Results:

• Instrumental analysis revealed higher mean ΔE00 values for single-shade composites compared to group-shade composites across all subgroups.
• Single-shade composites showed greater color differences in darker shades (D) over time.
• Visual analysis indicated a significant difference in color match between light-shade group-shade and single-shade restorations.

Conclusions:

• Group-shade resin composites generally provide a better color match than single-shade materials, especially when assessed spectrophotometrically and visually.
• The esthetic predictability of single-shade composites may be less reliable, particularly in challenging shade situations.
• Further research is needed to validate these findings in clinical settings.