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<p>The aim of this study was to evaluate the effectiveness of incorporating different concentrations (0, 1, and 5%) of titanium dioxide nanotubes&#xa0;(TiO<sub>2</sub>) into a 37% carbamide peroxide (CP) bleaching agent with or without activation by violet LED light (L) on tooth color change. Eighty bovine incisors were separated into eight groups (<i>n</i> = 10) according to the concentration of TiO<sub>2</sub> incorporated into CP, and L activation: HP (hydrogen peroxide 35%), CP, CPT1 (CP + 1% TiO<sub>2</sub>), CPT5 (CP + 5% TiO<sub>2</sub>), HPL, CPL, CPT1L, and CPT5L. The bleaching agents were applied for 30&#xa0;min (3 sessions). When L was associated, it was applied in 20 cycles of 60&#xa0;s with a 30&#xa0;s interval. Color analysis was performed at baseline, and 7&#xa0;days after the 1st, 2nd, and 3rd sessions (CIEL*a*b* and ΔE<sub>ab</sub>, ΔE<sub>00</sub>, and WI<sub>D</sub>). All the groups showed a significant increase in L* and a significant decrease in b* compared with the baseline (<i>p</i> &lt; 0.05), but there were no significant differences within each group (<i>p</i> &gt; 0.05). After the 2nd session, CPT1L and CPT5L showed greater variation in color change (ΔE<sub>ab</sub>, ΔE<sub>00</sub>, and ∆WI<sub>D</sub>) (<i>p</i> &lt; 0.05) compared with the respective groups without L. L activation was a determining factor for greater bleaching efficacy in the 2nd session, when CP was incorporated into TiO<sub>2</sub> in both concentrations (1% or 5%). TiO<sub>2</sub> association suggests increased effectiveness in color change when L is applied in the 2nd bleaching session, and may lead to less pulp damage when associated with a lower bleaching agent concentration.</p>

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Influence of concentrations of titanium dioxide nanotubes incorporated into a 37% carbamide peroxide bleaching agent and violet LED light activation on tooth color change

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Rodrigo Dacoreggio,
  • Natália Russo Carlos,
  • Kamila Rosamilia Kantovitz,
  • Erika Soares Bronze-Uhle,
  • Paulo Noronha Lisboa Filho,
  • Roberta Tarkany Basting

摘要

The aim of this study was to evaluate the effectiveness of incorporating different concentrations (0, 1, and 5%) of titanium dioxide nanotubes (TiO2) into a 37% carbamide peroxide (CP) bleaching agent with or without activation by violet LED light (L) on tooth color change. Eighty bovine incisors were separated into eight groups (n = 10) according to the concentration of TiO2 incorporated into CP, and L activation: HP (hydrogen peroxide 35%), CP, CPT1 (CP + 1% TiO2), CPT5 (CP + 5% TiO2), HPL, CPL, CPT1L, and CPT5L. The bleaching agents were applied for 30 min (3 sessions). When L was associated, it was applied in 20 cycles of 60 s with a 30 s interval. Color analysis was performed at baseline, and 7 days after the 1st, 2nd, and 3rd sessions (CIEL*a*b* and ΔEab, ΔE00, and WID). All the groups showed a significant increase in L* and a significant decrease in b* compared with the baseline (p < 0.05), but there were no significant differences within each group (p > 0.05). After the 2nd session, CPT1L and CPT5L showed greater variation in color change (ΔEab, ΔE00, and ∆WID) (p < 0.05) compared with the respective groups without L. L activation was a determining factor for greater bleaching efficacy in the 2nd session, when CP was incorporated into TiO2 in both concentrations (1% or 5%). TiO2 association suggests increased effectiveness in color change when L is applied in the 2nd bleaching session, and may lead to less pulp damage when associated with a lower bleaching agent concentration.