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Table 2 Number and percentage of teeth presenting rRCR ≥ 100% (no RR), rRCR between 90 and 100 (slight RR), rRCR between 80 and 90 (moderate RR), rRCR ≤80 (severe RR)

From: Root resorption during orthodontic treatment with Invisalign®: a radiometric study

rRCR (%) No. of teeth Percent
≥100 630 58.12
90 ≤ X < 100 281 25.94
80 ≤ X < 90 132 12.18
<80 40 3.69
TOT 1083 100