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Table 4 Number and percentage of the lower teeth presenting rRCR = 100% (no RR), rRCR between 90 and 100 (slight RR), rRCR between 80 and 90 (moderate RR), and rRCR = 80 (severe RR)

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

RCR % 4.3 4.2 4.1 3.1 3.2 3.3
No. of teeth 50 38 39 46 37 45
≥100 70.42% 53.52% 55.71% 65.71% 54.41% 63.38%
No. of teeth 15 17 12 17 25 19
90 ≤ x < 100 21.13% 23.94% 17.14% 24.28% 36.76% 26.76%
No. of teeth 6 10 13 7 5 6
80 ≤ x < 90 8.45% 14.08% 18.57% 10.00% 7.35% 8.45%
No. of teeth 0 6 6 0 1 1
<80 0.00% 8.45% 8.57% 0.00% 1.47% 1.41%
TOT no. of teeth 71 71 70 70 68 71
% 100% 100% 100% 100% 100% 100%