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Table 4 Reductions in root length from T1 to T2 in the study and control groups

From: Cone-beam computed tomography evaluation of periodontal and bone support loss in extraction cases

Tooth ( ) Reduction in root length (T1-T2; mm) P value
  Study group Control group
(n= 12) (n= 10)
Upper incisors    
 Right central (11) 1.79 1.04 < 0.05
 Right lateral (12) 1.51 0.83 < 0.05
 Left central (21) 1.53 0.90 < 0.05
 Left lateral (22) 1.28 0.96 < 0.05
Lower incisors    
 Right central (41) 1.00 0.73 < 0.05
 Right lateral (42) 1.46 0.70 < 0.05
 Left central (31) 0.97 0.66 < 0.05
 Left lateral (32) 1.37 0.77 < 0.05
  1. Reductions in root length as the measure of the external apical root resorption.