IADR Abstract Archives
Effectiveness of Hydrogen Peroxide-Free Bleaching Agents on Color Change
Objectives: The purpose of this in vitro study was to evaluate the effectiveness of five bleaching gels with four different active agents with the same active concentration when applied to human teeth following at-home bleaching treatments.
Methods: Human intact incisors were collected and the crowns were separated from the roots. For tooth color change assessment the tooth specimens were randomly distributed to 5 groups (n=6) and received at-home bleaching treatment for 14 days by applying the bleaching gel for 30 min each day. During this period the teeth were stored in artificial saliva at 37oC. In Group 1 a bleaching gel containing 3% phthlamidioperoxycaproic acid (PAP) was applied, in Group 2 the gel contained 17.3% polyvinylpyrrolidone (PVP) with 3% bounded hydrogen peroxide (H2O2), in Group 3 it contained 3% H2O2, in group 4 it contained 8.6% carbamide peroxide (equivalent of 3% H2O2) and in Group 5 the gel had the same composition with Group 1 but without PAP. Tooth color change (ΔΕab* and ΔΕ00) and whiteness index (ΔWID) was evaluated 24 h, 15 and 30 days after the treatments using a spectrophotometer.
Results: All the experimental groups exhibited ΔΕ00 and ΔWID higher than 50:50% acceptability (AT: ΔEab*>2.66, ΔΕ00>1.77, ΔWID>2.6) and 50:50% perceptibility (PT: ΔEab*>1.22, ΔΕ00>0.81, ΔWID>0.7) thresholds. The highest tooth color and whiteness changes presented the PAP-containing bleaching agent (ΔEab*=7.35±3.72, ΔΕ00=3.79±1.58, ΔWID=7.35±3.72), while the lowest the PVP-containing bleaching agent (ΔEab*=3.67 ±1.39, ΔΕ00=1.97 ±0.46, ΔWID=3.67 ±1.39).
Conclusions: The use of a novel H2O2-free bleaching agent presented comparable and even better effectiveness in color change when compared to conventional H2O2-containing bleaching agents for at-home bleaching treatment.
Methods: Human intact incisors were collected and the crowns were separated from the roots. For tooth color change assessment the tooth specimens were randomly distributed to 5 groups (n=6) and received at-home bleaching treatment for 14 days by applying the bleaching gel for 30 min each day. During this period the teeth were stored in artificial saliva at 37oC. In Group 1 a bleaching gel containing 3% phthlamidioperoxycaproic acid (PAP) was applied, in Group 2 the gel contained 17.3% polyvinylpyrrolidone (PVP) with 3% bounded hydrogen peroxide (H2O2), in Group 3 it contained 3% H2O2, in group 4 it contained 8.6% carbamide peroxide (equivalent of 3% H2O2) and in Group 5 the gel had the same composition with Group 1 but without PAP. Tooth color change (ΔΕab* and ΔΕ00) and whiteness index (ΔWID) was evaluated 24 h, 15 and 30 days after the treatments using a spectrophotometer.
Results: All the experimental groups exhibited ΔΕ00 and ΔWID higher than 50:50% acceptability (AT: ΔEab*>2.66, ΔΕ00>1.77, ΔWID>2.6) and 50:50% perceptibility (PT: ΔEab*>1.22, ΔΕ00>0.81, ΔWID>0.7) thresholds. The highest tooth color and whiteness changes presented the PAP-containing bleaching agent (ΔEab*=7.35±3.72, ΔΕ00=3.79±1.58, ΔWID=7.35±3.72), while the lowest the PVP-containing bleaching agent (ΔEab*=3.67 ±1.39, ΔΕ00=1.97 ±0.46, ΔWID=3.67 ±1.39).
Conclusions: The use of a novel H2O2-free bleaching agent presented comparable and even better effectiveness in color change when compared to conventional H2O2-containing bleaching agents for at-home bleaching treatment.