A combination of esthetic restorative treatment and vital bleaching is an important treatment plan in esthetic dentistry. In many instances, replacement of previous restorations after bleaching leads to better esthetic results , because bleaching agents can not whiten the color of esthetic materials such as composite resin.
The bleaching process adversely but transitionally reduces enamel and dentin bond strength when immediate bonding is performed after bleaching. This reduction can likely be related to a delayed release of oxygen from the bleaching agent that could either interfere with resin infiltration into etched enamel or inhibit polymerization of adhesive resin. Up to now, the most acceptable recommendation is to delay any restorative bonding after bleaching to solve this transient adhesion problem. It seems that the delay bonding at least 1 week after the last bleaching treatment is adequate. In addition, as slight tooth shade regression almost always is seen during the first few days after bleaching, delay bonding allows the tooth shade to stabilize. However in some situations, delay restorative treatment may tire patients and decrease their motivation. Therefore many researches have studied several materials to reverse the compromised strength faster. Interestingly a new research done by Burger et al., 2013 and published in the European Journal of Oral sciences has evaluated the antioxidant effect of green tea on microtensile bond strength (μTBS) to bleached enamel. And they concluded in their clinical trial that, green tea can be used as an alternative antioxidant on bleached enamel before bonding procedures.
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