Cervical root resorption and non vital bleaching

# Department of Conservative Dentistry and Endodontics, Institute of Dental Studies and Technologies, Modinagar, Ghaziabad. ABSTRACT Tooth-bleaching techniques today mostly employ hydrogen peroxide as the active agent. It is applied directly, or produced in a chemical reaction from sodium perborate or carbamide peroxide. More than 90% of success rate has been reported for intracoronal bleaching of non-vital teeth. Intracoronal bleaching is a conservative alternative to the more invasive esthetic treatment of non-vital discolored teeth. Careful examination is necessary, since the method requires healthy periodontal tissues and a root canal that is properly obturated to prevent the bleaching agent from reaching the peiapical tissues, and an effective gingival barrier which prevents the bleaching agents from leaching into the periodontium. Cervical root resorption is a possible sequel of internal bleaching and is more frequently observed in teeth treated with the thermo-catalytic bleaching method. A high concentration of hydrogen peroxide in combination with heat or etching also seems to promote cervical root resorption. Cervical root resorption is an inflammatorymediated external resorption of the root, which can be seen after trauma and following intracoronal bleaching.