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Table 3 Percentage of teeth affected by severe EARR (tooth level)

From: Root resorption, treatment time and extraction rate during orthodontic treatment with self-ligating and conventional brackets

  SL (n = 1112) Non-SL (n = 592) Total (N = 1704)
  n (%) n (%) n (%)
sEARR    
  Present 3 (0.3) 3 (0.5) 6 (0.4)
  Not present 1109 (99.7) 589 (99.5) 1698 (99.6)
  1. SL: self-ligating, SD: standard deviation, EARR: external apical root resorption.