Shade Modulation Ability of Direct vs. Direct-Indirect Prepless Composite Veneers

Area of Science:

• Dental Materials Science
• Restorative Dentistry
• Esthetic Dentistry

Background:

• Direct-indirect prepless composite veneers offer an alternative for esthetic restorations.
• Understanding shade modulation is crucial for achieving predictable esthetic outcomes with these veneers.

Purpose of the Study:

• To evaluate the shade modulation capability of direct-indirect prepless composite veneers.
• To compare instrumental and visual assessments of shade differences using various composite resins and cement shades.

Main Methods:

• Fabricated 270 direct and direct-indirect composite veneer samples with varying thicknesses (0.3, 0.5, 0.7 mm) using three composite resins.
• Bonded veneers to a standard C4 shade substrate using two cement shades (Variolink Esthetic LC neutral and light).
• Assessed color differences (ΔE₀₀) using spectrophotometry (instrumental) and evaluation by four dental professionals (visual).

Main Results:

• Instrumental color differences were significantly influenced by veneer technique, thickness, and composite resin type (p < 0.001).
• Cement shade did not statistically influence the final shade of direct-indirect veneers (p = 0.168).
• Visual assessment showed no significant shade mismatch between direct and direct-indirect veneer samples.

Conclusions:

• A discrepancy exists between instrumental and visual evaluations regarding shade differences in direct versus direct-indirect prepless composite veneers.
• The choice of cement shade did not affect the final esthetic outcome of the composite veneers in this study.