IADR Abstract Archives
3-month follow-up on the effectiveness of intracoronary bleaching, by spectrophotometer
Objectives: The aim of this randomized, double-blind clinical study was to compare the effectiveness and color stability of walking bleach technique using 35% hydrogen peroxide and 37% carbamide peroxide, measured with spectrophotometer Vita EasyShade.
Methods: Volunteer patients (n = 44) with root canal treatment made in good conditions with discolouration, were whitened with the Walking Bleaching technique. Two groups were randomly assigned: G1= 35% hydrogen peroxide (n=21) and G2= 37% carbamide peroxide (n=23). The non-vital bleaching was performed in four sessions using Walking Bleach technique. The color was evaluated at the beginning of treatment (baseline), immediately after the bleaching sessions, one week after treatment post-restoration, one and three months post-bleaching. Vita Easy Shade spectrophotometer was used with the CIE L * a * b system to measure the total variation in color (ΔE), between the baseline and the different evaluation times. To ensure that the color register was in the same place as the instrument, a silicone matrix was previously settled. For comparison between groups, the Mann-Whitney test was used (α = 0.05).
Results: The difference in mean color change (ΔE), recorded in different evaluation times, was higher in the group of hydrogen peroxide, but there was no significant difference at any time point (p> 0.05) except at sessions 3 and 4 (p< 0.05). These two groups showed a high effectiveness, with at least an average of change of color of 14 units.
Conclusions: Both 35% hydrogen peroxide and 37% carbamide peroxide are highly effective for the walking bleach technique in non-vital teeth.
Methods: Volunteer patients (n = 44) with root canal treatment made in good conditions with discolouration, were whitened with the Walking Bleaching technique. Two groups were randomly assigned: G1= 35% hydrogen peroxide (n=21) and G2= 37% carbamide peroxide (n=23). The non-vital bleaching was performed in four sessions using Walking Bleach technique. The color was evaluated at the beginning of treatment (baseline), immediately after the bleaching sessions, one week after treatment post-restoration, one and three months post-bleaching. Vita Easy Shade spectrophotometer was used with the CIE L * a * b system to measure the total variation in color (ΔE), between the baseline and the different evaluation times. To ensure that the color register was in the same place as the instrument, a silicone matrix was previously settled. For comparison between groups, the Mann-Whitney test was used (α = 0.05).
Results: The difference in mean color change (ΔE), recorded in different evaluation times, was higher in the group of hydrogen peroxide, but there was no significant difference at any time point (p> 0.05) except at sessions 3 and 4 (p< 0.05). These two groups showed a high effectiveness, with at least an average of change of color of 14 units.
Conclusions: Both 35% hydrogen peroxide and 37% carbamide peroxide are highly effective for the walking bleach technique in non-vital teeth.