Abstract
The aim of this study is review the existing literature on the cervical barrier sealing effectiveness in intracoronal bleaching. The walking bleaching technique is used in devitalized teeth that have suffered color changes. However, its use may be associated with adverse effects, such as external root resorption. It has been suggested the use of a cervical barrier at the mouth of the canal in order to minimize this risk. A variety of materials such as glass ionomer cement, zinc phosphate, zinc oxide without eugenol and MTA can be used for this purpose. It was found that none of the materials tested showed a hermetic sealing being necessary, in addition to cervical barrier preparation, other clinical procedures in order to minimize the risk of external root resorption following intracoronal bleaching.
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