Effect of Home Bleaching Agents on Color Stability and Surface Roughness of Hybrid Ceramics: An in vitro study.

Abstract

To evaluate the effect of two different home bleaching agents on the color stability and surface roughness of hybrid ceramics. Three dental hybrid ceramics (Lava Ultimate, CeraSmart, and Vita Enamic) and two different home bleaching agents (hydrogen peroxide [9.5%; HP] and carbamide peroxide [22%; CP]) were used. Thirty specimens with dimensions of 12 x 14 x 1 mm were prepared for each material. Technical polishing kits were applied to one surface of the specimens for the surface finishing procedure. The color parameters (L*a*b*) of specimens were measured. Three subgroups for each ceramic were determined: control (C), HP, and CP (n = 10 each). After bleaching procedures, the color parameters were remeasured, and color differences (ΔE) were calculated. The surface roughness values of the specimens were detected using a profilometer. Surface analysis was performed with a scanning electron microscope on one specimen from each group. Data were analyzed using two-way analysis of variance and Tukey honest significant difference tests. There was an interaction between material and bleaching agent type (P < .05). The highest ΔE values were observed in the CP groups, and the lowest ΔE values were observed in the C groups. For surface roughness, there was no interaction between material and bleaching agent type (P > .05). Material and bleaching agent factors had a significant effect on surface roughness (P Δ .05). The highest surface roughness values were detected in the HP groups. Home bleaching agents caused clinically acceptable color differences on hybrid ceramic materials. HP increased the surface roughness of hybrid ceramics.