ABSTRACT
The aim of the current study was to assess the effect of two different bleaching techniques; home and in-office bleaching on three different laminate veneer materials; lithium disilicate (E-max), hybrid ceramic (Enamic) and CAD CAM/composite (Crios), after thermocycling in a coffee staining solution.
Subjects and Methods: In this in vitro study, 42 specimens with 0.6 mm thickness were made from three dental esthetic materials (E-max, Vita Enamic and Brilliant Crios), 14 of each material, with high translucency (HT ), shade of A2 and 2M2. The shade of the specimens were measured using spectrophotometer. Then coffee staining under thermocycling condition was done.
Using spectrophotometer, shade was again measured, then half of the specimens, seven of each group were home bleached and the other half was in office bleached. Then, finally the shade was measured using spectrophotometer to evaluate the color stability of each material.
Results: Statistical analysis revealed that there is statistically significant difference in the color change between the three materials as the E-max showed the best color stability (∆E = 3.67±0.17), followed by Vita Enamic (∆E = 4.25±0.29) followed by Brilliant Crios that showed the highest color change (∆E = 5.33±0.30). When comparing the two bleaching techniques, in-office bleaching showed more whitening effect than home bleaching, however, the statistical analysis showed that there is no statistically significant difference between the effect of home bleaching (∆E = 4.38±0.74) and in-office bleaching (∆E = 4.46±0.77) when used with the three veneering materials.