Effect of Post-bleaching Surface Microroughness with Whiteness HP Blue vs Whiteness HP Maxx on Different Locations of Bovine Enamel

Aim: To compare the effect after bleaching with 35% hydrogen peroxide with and without calcium gluconate on surface microroughness in an in vitro study on the bovine enamel. Materials and methods: The study had an in vitro experimental design. The following groups were formed: group I: MV (mesiovestibular) enamel, group II: V (vestibular) enamel, and group III: DV (dystovestibular) enamel, undergoing treatment with Whiteness HP Blue (H₂O₂ at 35% with calcium gluconate), Whiteness HP Maxx: H₂O₂ at 35% (without calcium gluconate), and physiological serum. A Surftest SJ-210 digital roughness meter (Mitutoyo) was used to evaluate microroughness. Results: The highest mean microroughness was found in group II (V) with 0.23 ± 0.13 µm and 0.17 ± 0.02 µm for Whiteness HP Blue and Whiteness HP Maxx, respectively. The post hoc analysis of surface microroughness subjected to H₂O₂ with and without calcium gluconate showed that there were only statistically significant differences between Whiteness HP Blue and the control (p = 0.032). Conclusion: There were no significant differences in surface microroughness on comparing the Whiteness HP Maxx group with the control group and the Whiteness HP Blue group. Clinical significance: The clinical importance of this study was that it allowed us to know the direct impact that bleaching agents with and without calcium have on dental structures.