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Table 3 Number and percentage of the upper 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 % 1.6 1.4 1.3 1.2 1.1 2.1 2.2 2.3 2.4 2.6
No. of teeth 36 39 41 46 39 39 31 41 36 27
≥100 52.17% 59.09% 61.19% 70.77% 55.71% 56.52% 48.44% 59.42% 55.38% 46.55%
No. of teeth 15 17 15 14 16 20 19 18 20 22
90 ≤ x < 100 21.74% 25.75% 22.39% 21.54% 28.86% 28.98% 29.69% 26.08% 30.77% 37.93%
No. of teeth 16 9 9 4 13 7 9 8 3 7
80 ≤ x < 90 23.19% 13.63% 13.43% 6.15% 18.57% 10.14% 14.06% 11.59% 4.61% 12.07%
No. of teeth 2 1 2 1 2 3 5 2 6 2
<80 2.9% 1.51% 2.98% 1.54% 2.86% 4.35% 7.81% 2.9% 9.23% 3.45%
TOT no. of teeth 69 66 67 65 70 69 64 69 65 58
% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100%