In the present study bleaching agent
used was 38% hydrogen peroxide solution.
When the bleaching agent
causes demineralization in enamel, ionic changes are induced; this increases the minerals uptake from the saliva, replacing the lost minerals in the enamel surface.
A 10% Carbamide peroxide bleaching agent
is the most commonly used at-home bleaching product.
If bleaching of the cervical region of the tooth is required, a stepwise reduc- tion of the labial part of the seal and use of a mild bleaching agent
are recommended for the final dressings.
Miranda et al (42) claim that the reduction in microtensile bond strength when using 22% carbamide peroxide may occur up to three weeks after application of the bleaching agent
for two reasons: first, for a structural alteration associated with loss and erosion of the enamel prismless layer plus a reduction in the percentage of calcium and phosphorus; the second reason is of a residual nature, and is connected to the penetration of oxygen radicals in the enamel, which can inhibit polymerization.
The Chinese publication also said that some of Yuzhong's bleaching agents
contained as much as 30% pulverized lime.
This study was designed to evaluate the in vivo tooth whitening efficacy of Colgate Visible White containing 9% hydrogen peroxide (9%HP) relative to Opalescence containing 20% carbamide peroxide (20%CP), which breaks down into an active bleaching agent
concentration of approximately 7.
Regulating the charge of bleaching agent
on the basis of chip quality could cut the cost of bleaching.
In "Effects of a Bleaching Agent
on Human Gingival Fibroblasts" Dr.
The latter is a more selective bleaching agent
because of its reductive nature.
TAED is a bleaching agent
in detergents but can also be used as a biocide.
The chemical dioxin, which has drawn widespread concern since the late 1980s, is produced through a variety of industrial processes, including paper-making methods that use chlorine as a bleaching agent