Long-term Color and Translucency Stability of Resin Composites with Different Surface Roughness

Objectives: To evaluate the effect of long-term distilled water storage on the color and translucency parameter of composites with different surface roughness.
Methods: Thirty disc-shaped specimens (10x2mm) for each resin composites shades A2 were prepared (Tetric N-Ceram , Filtek Z250, GC Gradia Direct Posterior) and submitted to surface treatments with SiC 1000 papers, Enhance Finishing System(Dentsply) and Sof-Lex aliminum oxide discs(3M/ESPE). Average surface roughness (Ra) was measured with a profilometer. Color and translucency were recorded using a colorimeter after 24-hour storage and after 36-months storage in distilled water(37⁰C). Three way ANOVA and Paired t test were employed for statistical analysis.
Results: The data showed statistically significant interaction between surface roughness and materials on color change (ΔE);but only the materials have an effect on translucency parameter (TP) (p<0.001). Tetric N-Ceram showed the smallest aging-dependent color shift folllowed by Filtek Z250 and GC Gradia Direct Posterior. GC Gradia direct showed the smallest aging-dependent translucency shift followed by Filtek Z250 and Tetric N-Ceram.
Conclusions: Effect of aging on color of resin composites were surface roughness and composite dependent. Translucency was not affected by surface roughness among the water storage.