Colorimetric evaluation of nanofilled resin composites

Objectives:The purpose of this study was to evaluate the optical properties of standard-shades, enamel-shades, and dentin-shades of nanofilled resin composites over commonly used two backgrounds.

Materials and Methods:Nanofilled resin composites (Filtek Suprime XT, 3M-Espe) were used in this study. Color( Standard-Shade A1B-A2 B-A3 B-A3.5 B-A4 B-B1 B-B2 B-B3 B-C1 B-C2 B-C3 B Enamel-Shade A1E-A2E-A3E-B1E, -B2E-D2E, Dentin-Shade A1D-A2D-A3D-A4D-A6D-B3D-C4D-C6D) of cured resin composite dicks after polishing with 600-, 800- or 1200- grit SiC paper were measured according to the CIELAB color scale relative to the illuminant D65 on white background and black background. Specimens were fabricated 0.5 mm thickness. Color (L*,a*,b*) , TP(Translucency parameter) and CR(Contrast ratio) were calculated.

Results:Background influenced the color coordinates and color difference by the specimen shades. L* values of standard-shade ranged from 78.7 to 90.9 on white background and ranged from 61.7to 70.9 on black background. , enamel-shade ranged from 92.7 to 88.9 on white background and ranged from 66.2to 69.2 on black background, and dentin-shade ranged from 87.7 to 64.1 on white background and ranged from 54.2to 77.72 on black background. ANOVA showed a significant difference in the CR and TP values for the 3 groups materials (p<0.05).

Conclusion:The nanofilled resin composites showed the potential to improve the appearance of teeth when being applied as two layer. Correlation between the measured color and varied shades of background should be further studied.