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

Purpose: To evaluate the effect of two different home bleaching agents on the color stability and surface roughness of hybrid ceramics.

Materials And Methods: 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.

Results: 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.

Conclusion: Home bleaching agents caused clinically acceptable color differences on hybrid ceramic materials. HP increased the surface roughness of hybrid ceramics.