Color adjustment potential of universal shade bulk-fill resin composites

Area of Science:

• Dental Materials Science
• Restorative Dentistry

Background:

• Accurate color matching is crucial for aesthetic dental restorations.
• Bulk-fill resin composites offer efficiency but their color adjustment potential requires investigation.

Purpose of the Study:

• To evaluate the influence of cavity depth on the color adjustment potential of universal shade bulk-fill resin composites.
• To compare the color adjustment of structural-colored and pigment-incorporated universal shade bulk-fill resin composites at different depths.

Main Methods:

• Standardized cavities (4mm diameter, 2mm and 4mm depth) were prepared in artificial teeth.
• Structural-colored and pigment-incorporated universal shade bulk-fill resin composites were placed and polished.
• Color differences (ΔE*ab and ΔE₀₀) were measured to assess color adjustment.

Main Results:

• Color difference values varied based on composite type and cavity depth.
• Pigment-incorporated universal shade composites showed a wider range of color differences (ΔE*ab: 2.2-9.6; ΔE₀₀: 1.7-5.8).
• Structural-colored composites exhibited lower color differences (ΔE*ab: 3.3-4.6; ΔE₀₀: 2.7-3.4).

Conclusions:

• Cavity depth is a significant factor affecting the color adjustment potential of bulk-fill resin composites.
• Restoration depth influences the clinical predictability of achieving accurate shade matching with these materials.