Contamination of the root surface has been found to
be a prognostic indicator for root resorption. The
prevalence of resorption in teeth replanted without
visible contamination has been reported to be 57 per
cent, whereas 75 per cent of teeth that were washed and
87 per cent of those that were rubbed clean underwent
resorption. When teeth were replanted with visible
contamination still present, 100 per cent exhibited
resorption.