IADR Abstract Archives
Color Masking of CAD/CAM Restorative Materials for Veneer
Objectives: To assess the color masking properties (ΔE) of four CAD/CAM restorative materials over tooth-shaded backgrounds.
Methods: Four types of CAD/CAM veneer materials shaded A2 were included: Lava Ultimate (LU) (3M); IPS Empress CAD (IPS) (Ivoclar); Vita Enamic (VE) (Vita); and Vitablocs Mark II (VMII) (Vita). The CAD/CAM block materials were sectioned into tiles in three different thicknesses: 0.3, 0.5 and 0.7mm (n=7 per group). Veneer tiles were used to mask four tooth-shaded acrylic backgrounds: A3, A4, B3 and C2 (Coldpac, Motloid).
The color (CIE - L*a*b*) of each veneer specimen was measured against neutral grey background, then against each tooth-shaded background. Backgrounds were also measured using a spectrophotometer (Xrite i5). Color differences (ΔE) of tested materials against acrylic backgrounds were calculated. Each veneer specimen was measured against black background and white background to calculate translucency parameter. Two-way ANOVA was used to compare the differences in ΔE among the groups (α=0.05).
Results: Significant differences in masking properties were found among the tested material with all three thicknesses (p<0.0001). Thicker veneer materials exhibited higher color masking. Calculating ΔE values of the tested materials over different tooth-shaded backgrounds, all veneer specimens over shade A3 background produced the highest color masking ability. LU and VE exhibited better color masking than IPS and VMII. IPS showed significantly higher in translucency than the other groups, followed by VMII, as shown in Table 2.
Conclusions: Color masking efficiency is dependent on veneer thickness, background shade and type of veneer material. Lower translucency of veneer materials produced better color masking.
Methods: Four types of CAD/CAM veneer materials shaded A2 were included: Lava Ultimate (LU) (3M); IPS Empress CAD (IPS) (Ivoclar); Vita Enamic (VE) (Vita); and Vitablocs Mark II (VMII) (Vita). The CAD/CAM block materials were sectioned into tiles in three different thicknesses: 0.3, 0.5 and 0.7mm (n=7 per group). Veneer tiles were used to mask four tooth-shaded acrylic backgrounds: A3, A4, B3 and C2 (Coldpac, Motloid).
The color (CIE - L*a*b*) of each veneer specimen was measured against neutral grey background, then against each tooth-shaded background. Backgrounds were also measured using a spectrophotometer (Xrite i5). Color differences (ΔE) of tested materials against acrylic backgrounds were calculated. Each veneer specimen was measured against black background and white background to calculate translucency parameter. Two-way ANOVA was used to compare the differences in ΔE among the groups (α=0.05).
Results: Significant differences in masking properties were found among the tested material with all three thicknesses (p<0.0001). Thicker veneer materials exhibited higher color masking. Calculating ΔE values of the tested materials over different tooth-shaded backgrounds, all veneer specimens over shade A3 background produced the highest color masking ability. LU and VE exhibited better color masking than IPS and VMII. IPS showed significantly higher in translucency than the other groups, followed by VMII, as shown in Table 2.
Conclusions: Color masking efficiency is dependent on veneer thickness, background shade and type of veneer material. Lower translucency of veneer materials produced better color masking.