What should we pay particular attention to when treating root canals in teeth with apical lesions?

When there is a lesion, consider that the bacterial load may be higher. You can perform more effective irrigation and, if possible, place calcium hydroxide in the canal and choose two visits. In these cases I prefer to enlarge the apical area to larger diameters for better healing. For this I prefer the specially designed Super System larger file system, which permits enlargement to larger apical diameters without excessive coronal tooth loss.