Objective: This randomized clinical study evaluated
two parameters: 1) the clinical color rebound
of whitening patients’ tooth discoloration
using thewalking bleaching technique and 2) the
impact on psychological and aesthetic self-perception
at the one-year follow-up of patientswho
underwent bleaching of nonvital teeth.
Methods and Materials: Fifty study participants
with nonvital tooth discoloration were
recruited. Teeth were assigned randomly into
one of two groups: 1) 35% hydrogen peroxide
(n=25) and 2) 37% carbamide peroxide (n=25).
Intracoronal bleaching was carried out over
the course of four sessions using the walking
bleach technique. Tooth color was evaluated
after each session in order to measure the total
color variation (DE). The guide was arranged
from highest (B1) to lowest values (C4) for
evaluating color, and color changes using Vita
Classical Shade (DSGUs) units were calculated.
Subjective and objective assessments were
compared with the counterpart of the tooth.
Aesthetic perception and psychosocial factors
were evaluated before and after treatment by
the Oral Health Impact Profile (OHIP) and
Psychological Impact of Dental Impact Questionnaire
Results: Color changes (DE) were 15.48 6 5.17
and 14.02 6 4.85 for carbamide and hydrogen
peroxide groups, respectively. There were no
significant differences (p.0.05) between these
two groups at the one-year follow-up. There
was a decrease in the PIDAQ scores after
treatment compared to baseline values (p,0.05). The majority of OHIP values regressed
to baseline values.
Conclusion: The technique of walking bleaching
was highly effective and showed minimal
color rebound in nonvital teeth and had a
positive effect on patients’ psychological impact
at the one-year follow-up.