Abstract:

Objective To investigate the effect of the color of resin cement on the color of CAD/CAM lithium disilicate ceramic veneers. Methods Different colors (ND1-ND7) of abutment specimens and IPS e.max CAD LTA1 0.7 mm ceramic slices were prepared and cemented by resin cement Variolink N (four different colors). The color of veneers was measured. The color difference (ΔE) between the color of veneers and standard color (2 mm LTA1, LTA2 lithium disilicate ceramic blocks) was calculated. ANOVA analysis and Tukeys HSD test were performed for multiple comparisons. Results ΔE values were smaller than the clinical acceptance level. The differences of the following colors were not statistically significant: white, yellow, and bleach XL of the ND1 group (P=0.999, 0.969, and 0.991); colors of the ND2 group (df=3, F=2.865, P=0.069); white and yellow of the ND4 group (P=0.819); white, transparent color, and yellow of the ND5 group (P=1.000, 0.998, 1.000); and transparent color, white, and yellow of the ND6 group (P=0.487,0.169,0.883). For the ND3 group, only ΔE values of the yellow color were smaller than the clinical acceptance level and the differences between the ND3 group and other groups were statistically significant (P<0.05). ΔE values of all colors of the ND7 group were larger than the clinical acceptance level. Conclusion Under limited conditions, the yellow color of veneers is insufficient after cemented by Veriolink N resin cement and the adjustment of yellow color is needed. Bleach XL resin cement will turn the veneer color towards cool color tone and yellow resin cement will turn the veneer color towards warm color tone. The effect of white and transparent resin cement is between that of bleach XL and yellow resin cement.

Key words: CAD/CAM lithium disilicate ceramic veneer, different color of resin cement, different abutment color, color matching