How Different Toothpastes Effect the Bleached Enamel Roughness?

Objectives: To evaluate the effect of different toothpastes on surface roughness of bleached enamel.
Methods: A total of 60 healthy bovine incisor teeth were used for the study. After the teeh were in-office laser-bleached, they were randomly divided into five groups to receive brushing with the following toothpastes (n=12): G1- regular toothpaste (Colgate Total 12), G2- whitening toothpaste with poloxamer (Colgate Optic White Oxygen), G3-whitening toothpaste with hyrogen peroxide (Colgate Optic White Expert), G4- whitening toothpaste with charcoal powder (Colgate Optic White Charcoal) G5- anti-erosive/desentizing toothpaste (Sensodyne Proenamel). All groups were subjected to brushing using toothbrushing simulation machine, approximating the equivalent of 2 weeks of regular brushing. Surface roughness (Ra, µm) analyses of each group were performed before bleaching-baseline (T₀), immediately after bleaching (T₁) and tooth brushing after bleaching (T₂) by using a contact stylus profilometer. The data were analyzed by repeated measure analysis of variance, Friedman test and Kruskal-Wallis tests (p<0.05).
Results: There were no statistically significant differences over time (T₀ vs T₁ vs T₂) in Ra for all tested toothpaste groups except for anti-erosive/desentizing toothpaste group (G5) (p>0.05). In G5, significant difference was detected between baseline (T₀) and brushing after bleaching (T₂) (p<0.05). However no difference was found between (T₁) and (T₂) (p>0.05). When comparing all groups at T₂, the anti-erosive/desensitizing toothpaste-G5 demonstrated the lowest surface roughness significantly differing from that of the other groups (p<0.05). No significant difference was detected among the rest of the toothpaste groups (p>0.05).
Conclusions: Simulated brushing with different toothpastes did not alter the roughness of laser-bleached enamel. Only the use anti-erosive/desensitizing toothpaste after bleaching seems to be effective in reducing the initial surface roughness of the enamel.