Teeth bleaching has different effects on different types of teeth, teeth surfaces, restorations and other materials. It can bleach the teeth but not the restorations. These effects are discussed as under:
Carbamide peroxide decreases hardness of the enamel.
It can cause uniform color change.
The teeth bleaching agents penetrates from enamel and dentine into the pulp. Thus will cause – slow decrease in blood flow (pulpal), and pulpal blood vessels occlusion.
Home bleaching materials or agents do not affect cementum but there are patients where due to intracoronal bleaching by 30–35% hydrogen peroxide causes cervical resorption and external root resorption.
On Composites: surface roughness & gives etched appearance, decrease in tensile strength, increase in surface hardness, and increase in micro leakage.
6. On Other Materials: no effect on gold restoration, in case of amalgam it causes changes in micro structure occurs, in glass ionomers there is alteration of the matrix, in interim restorative material due to hydrogen peroxide there is cracking of the restoration, the crowns made from methyl methacrylate they undergo color change and turns orange.
Hydrogen Peroxide (30 – 35 %) causes mucosal irritation & burning sensation.
Causes Gentotoxicity & Carcinogenicity
Toxicity can result if taken in higher concentration.
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