Tooth bleaching with hydrogen peroxide and nano-hydroxyapatite: a 9-month follow-up randomized clinical trial.
Int J Dent Hygiene DOI: 10.1111/idh.12123 , , , , . Tooth bleaching with hydrogen peroxide and nano-hydroxyapatite: a 9-month follow-up randomized clinical trial.
Abstract
Objectives
The
aim of this study was to compare the amount of tooth colour change,
rebound rate and tooth sensitivity in patients submitted to a bleaching
technique with 6% hydrogen peroxide (HP) with or without 2%
nano-hydroxyapatite (n-HA).
Methods
Sixty
subjects were included in this examiner-blinded, randomized clinical
trial using a 6% HP gel with or without 2% n-HA. Tooth colour and tooth
sensitivity were analysed before and after treatment. All data were
analysed statistically.
Results
After bleaching, both treatments demonstrated significant improvements in tooth shade (P < 0.05 for both groups). At the 9-month recall, tooth shade remained significantly lighter than at baseline (P < 0.05
for both groups). However, a relapse of the tooth shade was observed
compared with the immediate post-bleaching result (P < 0.05). 6% HP with 2% n-HA produced significantly lower sensitivity (P < 0.05) than the bleaching product without n-HA. Colour change evaluation resulted in no difference between the two groups.
Conclusion
Both
treatments demonstrated significant improvements in tooth shade. The
bleaching effectiveness of the tested products was comparable. The use
of 6% HP with 2% n-HA reduced the incidence of sensitivity during the
bleaching treatment compared to a bleaching agent that did not contain
n-HA.
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