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Table 3 Distribution of the root length reduction during orthodontic treatment: post-treatment RCR relative to pre-treatment RCR (rRCR), absolute (n) and relative (%) frequencies (n = 1600): rRCR < 80 means a reduction over 20% of pre-treatment root length

From: Apical root resorption during orthodontic treatment with aligners? A retrospective radiometric study

rRCR Frequency Percent
  (n) (%)
rRCR < 80 101 6.31
80 ≤ rRCR < 90 191 11.94
90 ≤ rRCR < 100 444 27.75
rRCR ≥ 100 864 54.00