Cervical root resorption following bleaching of endodontically treated teeth

By Madison, S. and Walton, R.

Date: 01/1990
Journal: JOE

Purpose:

To examine the effects of various factors used in bleaching techniques on the initiation of external root resorption in an animal model.

Materials/Methods:

  • N=45 maxillary and mandibular anterior teeth in 5 beagles. Assigned to the following control and experimental groups:
  • No root canal treatment (RCT), no bleaching (five teeth)
  • RCT only, no etching and no bleaching (five teeth)
  • Experimental group 1 (etched + RCT)—
  • Thermocatalytic bleached (five teeth)
  • Walking bleached (five teeth)
  • Combination (five teeth)
  • No bleaching (five teeth)
  • Experimental group 2 (non-etched + RCT)—
  • Thermocatalytic bleached (five teeth)
  • Walking bleached (five teeth)
  • Combination (five teeth)

Results:

1.5 of the 30 teeth in the experimental groups that included root canal treatment and thermocatalytic bleaching showed significant resorptive defects. Some resorption areas also had superimposition of ankylosis.

2.In the group of I0 teeth with walking bleach only, no resorptive defects were noted histologically.

3.Root resorption was not observed radiographically in any of the control or experimental treatment

Clinical Significance:

  • 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