Variables P-value
Examiners
I II III
Periapical lesion (yes/no)a 0.109 0.201 0.165
Size of radiolucencyb 0.001 0.002 0.002
Relationship between root and radiolucencyb 0.389 0.4 0.132
Location of bone destructionb 0.112 0.199 0.138
Presence of root canal obturation (yes/no)a 0.125 0.227 0.039
Obturation length, mmb 0.361 0.167 0.222
Obturation homogeneityb 0.168 0.015 0.21
Coronal seal (yes/no)a 1 1 1
Coronal seal (adequate/inadequate)b 0.394 0.182 0.853
Presence of complications/failuresa 0.62 0.91 0.712
Root perforationa 0.5 0.625 0.0001
Endodontically treated root with radiolucencya 0.275 0.254 0.089
Instrument fracturesa 0.25 0.25 0.25
Post inside the root canala 1 0.739 0.739

The P-values for the estimated differences in the observations obtained by DPR and CBCT, by three examiners
aMcNemar test (statistically significant at the level P ≤ 0.05);
bMcNemar-Bowker test (statistically significant at the level P ≤ 0.05).
DPR = digital periapical radiography; CBCT = cone-beam computed tomography.