Early recognition of ECR is important to improve prognosis. Treatment requires complete removal of the resorptive tissue and proper restoration.
Walking bleach technique is a good treatment for discolored root canal treated teeth, but proper precautions are necessary to prevent cervical resorption.
30% hydrogen peroxide treatment may cause alteration in the chemical structure of the dentin and cementum making them more susceptible to degradation.
From the results of this study, heat plus 30% H202 was the combination associated with resorption. Etching alone is not responsible for the resorptive process
These results caution against indiscriminate use of bleaching with hydrogen peroxide, and emphasize the importance of preventive measures and postoperative follow-up of bleached pulpless teeth.
Oxygen peroxide can injure the periodontal tissue and cause resorption and ankylosis by allowing bacteria to penetrate dentinal tubules
If this procedure is used, the orifice of the root canal should be covered, e.g. with a zinc-oxide eugenol cement, in order to prevent oxygen peroxide from reaching the root dentin.
In cases of traumatic pulp devitalization, internal bleaching may cause cervical resorption
Bleaching agents placed in the chamber altered or removed the tetracycline.
It may be possible to used internal bleaching as an alternative to bonded restorations to reverse tetracycline staining.
After 18 months the bleach shade remained the same for the tetracycline stained teeth