Table 6. Classification of the quality of filling [n (%)] in the root canals and in the isthmus area.

^*Scores for the classification of root canal filling quality. 1: absence of defects, 2: presence of defects in the filling material, 3: presence of defects at the filling/dentin wall interface, 4: presence of defects in the filling material and the dentin interface, 5: image does not allow adequate diagnosis. ^**Scores for classification of filling quality in the isthmus. 1: filling material absent, 2: isthmus partially filled with filling material, 3: isthmus completely filled with filling material, 4: image does not allow adequate diagnosis of filling material, and 5: not detectable.