The purpose of this study was to examine the incidence of external root resorption in bleached pulpless teeth and its relation to various factors, as well as to assess the long-term esthetic results of bleaching.
N =58 bleached pulpless teeth were re-examined after periods of 1-8 years.
The recall examination of each tooth consisted of recording the following: history of trauma during follow-up period, response to percussion, mobility, sulcus depth and appearance of marginal gingiva. The color of each bleached tooth was classified. There had not been any pre- or postoperative trauma in any of the 4 cases.
The occurrence of resorption was not related to the bleaching technique used. Resorptive lesions were found to have been initiated apical to and not at the cemento-enamel junction. External resorption was found in 4 of the 58 teeth (6.9%).
The esthetic results: 29 of the 58 bleached teeth (50%) were found satisfactory and 17 teeth (29%) were clinically acceptable. The bleaching failed in 12 teeth (21%),of which 4 had received full coverage restorations.
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.