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Table 4 The association between bony changes in mandible and mandibular canal visibility with ORN post dental extraction

From: Predictors of osteoradionecrosis following irradiated tooth extraction

Variable All extracted teeth, n (%) Teeth with no ORN, n (%) Teeth with ORN, n (%) p value
Bony changes     
 Sclerosis 58 (36.5%) 54 (37.5%) 4 (26.7%) 0.022a*
 Resorption 9 (5.7%) 7 (4.9%) 2 (13.3%)  
 Mixed radiopaque-radiolucency 19 (11.9%) 14 (9.7%) 5 (33.3%)  
 No change 73 (45.9%) 69 (47.9%) 4 (26.7%)  
Mandibular canal UCL visibilityc     
 Visible 54 (50.5%) 50 (54.3%) 4 (26.7%) 0.047b*
 Invisible 53 (49.5%) 42 (45.7%) 11 (73.3%)  
Mandibular canal LCL visibilityc     
 Visible 92 (86.0%) 82 (89.1%) 10 (66.7%) 0.035a*
 Invisible 15 (14.0%) 10 (10.9%) 5 (33.3%)  
  1. UCL upper cortical line, LCL lower cortical line
  2. aFisher’s exact test
  3. bPearson chi-square test
  4. cLOWER incisors were not applicable to mandibular canal visibility assessment (N = 107)