Hybrid light applied with 37% carbamide peroxide bleaching agent with or without titanium dioxide potentializes color...

The effectiveness of dental color change was assessed by incorporating titanium dioxide (TiO₂) into 37% carbamide peroxide bleaching agent associated with hybrid light.

Fifty bovine incisors were selected to receive the bleaching treatment, and separated into five groups (n = 10): 35% hydrogen peroxide (HP) (Whiteness HP, FGM/HP); 37% carbamide peroxide (CP) (Whiteness SuperEndo, FGM/CP); CP + hybrid light (HL) (CP HL); CP + 1% TiO₂ (CP TiO₂); CP TiO₂ + hybrid light (CP TiO₂ HL). The bleaching gels were applied to the dental surface for 30 min. Hybrid light (Whitening Plus, DMC/infrared laser diodes + blue LEDs +violet LEDs) was applied with 1 min of active light, alternating with 1 min of pause. A spectrophotometer (VITA Easyshade® Advance, Vita) was used to determine the color of the dental elements at baseline and time points after the 1st, 2nd and 3rd bleaching sessions. Color change effectiveness was evaluated using Vita Classical, CIEL*a*b*, WI_D and ΔE_ab, ΔE₀₀ and ΔWI_D parameters.

Generalized mixed linear models for repeated measures (α = 5%) showed significant decrease in Vita Classical scores and a* and b* values, as well as an increase in L* and ∆W_ID values for all the groups. Higher color change values for ΔE_ab were observed for CP HL and CP TiO₂ HL, while those of ΔE₀₀ and ΔWI_D were higher for CP TiO₂ HL at the end of the bleaching treatment.

Hybrid light applied with TiO₂ incorporated into CP potentiated the effectiveness of the color change in the tooth structure_.