External resorption associated with bleaching of pulpless teeth

By Harrington, G.W. and Natkin, E.

Date: 01/1979
Journal: JOE


To examine a possible direct cause and effect relationship of resorption to bleaching


N = 4 cases

1. 14-year-old girl,was first seen in 1966. The pulp of the maxillary left central incisor had been devitalized in a fall against a door two weeks previously, she had a RCT and within 6 weeks the tooth started to discolor. The lingual silicate restoration was removed, and the crown was bleached using Superoxol and a heat lamp.’ 3.5 Years later she had massive external resorption and lost the tooth

2. 21 Years old with devitalized central incisor due to trauma. Tooth was discolored after RCT and . Superoxol and sodium perborate was sealed in the pulp chamber and removed and tooth was restored after bleaching occurred. 7 years later her presented with cervical resorption.

3. 29 year old man with discolored right central incisor. Same bleaching procedure used. He presented 3.5 years later with sinus tract and cervical resorption.

4. 15 year old girl with trauma on maxillary incisor . She had RCT and 8 years later internal bleaching using similar procedure. She presented 2 years later with extensive cervical resorption on the mesial.



  1. The trauma may have initiated inflammatory resorption
  2. Injury to the cervical periodontal tissues and a resulting inflammatory resorptive process could possibly

Have occurred as a result of inadvertent leakage of Superoxol onto the  tissues.

  1. The Heat lamp caused the injurygingival
  2. May be the connection between cervical tubules that caused the injury to periodontal ligament.

Clinical Significance:

In cases of traumatic pulp devitalization, internal bleaching may cause cervical resorption