Clinical evaluation of 4% hydrogen peroxide bleaching in mandibular teeth

Resumo

Introduction: Bleaching agents have been constantly introduced
into market; however, the efficacy of new hydrogen peroxides still
needs to be evaluated. Objective: The aim of this study was to
evaluate in vivo the effectiveness of 4% hydrogen peroxide bleaching
agent in color change, bleaching maintenance, tooth sensitivity, and
patients’ satisfaction. Material and methods: Forty subjects were
selected, lower bleaching trays were constructed, and the patients
were instructed to apply 4% hydrogen peroxide bleaching agent at
home. Shade measurements of the mandibular anterior teeth were
carried out with a spectrophotometer and Vita Classical shade guide
(VITA) at the following moments: baseline, 14 days, after patients’
satisfaction, and after 90 days. In addition, tooth sensitivity was
evaluated using a visual analogue scale (VAS) at the first 14 days.
Shade measurements were submitted to repeated measures ANOVA
with Bonferroni adjustment and level of significance set at 5%. Results:
Statistically significant differences were found for mandibular tooth
shade after at-home bleaching (p < 0.001). After 14 days of bleaching,
90% of the subjects were not pleased with the achieved bleaching;
however, after 27 days most of the patients reported to be satisfied.
Tooth sensitivity was reported to range from 1.01 in a scale from
0-10. Conclusion: At-home bleaching using 4% hydrogen peroxide
is effective in lower teeth with reduced tooth sensitivity.